Journal of Chemical Engineering of Chinese Universities

 

Current Issue

  • Characterization and mechanism of droplet aerosol agglomeration under the effect of low-frequency acoustic waves

    LIU Hengyuan;ZHONG Zhaoping;NIE Junle;XU Yueyang;YANG Yuxuan;ZHOU Junwu;LI Yihui;School of Energy and Environment, Southeast University;State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission,China Energy Science and Technology Research Institute Co.Ltd.;

    Industry generates a large number of liquid droplets which, if not treated, can cause waste or pollution,and even pose a safety hazard. To investigate the effect of acoustic on the agglomeration of droplet aerosols, an experimental platform was set up with a laser testing system to monitor the transmittance of droplet aerosols in real time. The study primarily focused on the influences of the presence of acoustic waves, acoustic frequency, sound pressure level, and initial droplet mass concentration on droplet agglomeration, and also analyzed the agglomeration mechanism. The results show that: under the effect of acoustic wave, the droplet aerosol dissipates rapidly, and the transmittance reaches 68%in 10 s, while the transmittance does not change in 60 s when there is no acoustic wave;The best droplet agglomeration is observed at an acoustic frequency of 1 000 Hz, and calculation of the entrainment coefficient and the relative entrainment coefficient indicates that the orthokinetic interaction plays a major role at this frequency; The higher the sound pressure level, the faster the change in transmittance of the droplet aerosol,and the better the agglomeration effect, but the sound pressure level should not be too high as it would increase energy consumption and lead to nonlinear effects, limiting the improvement in agglomeration efficiency;Higher initial droplet mass concentration results in faster agglomeration rates because there are more droplets within a unit volume, reducing the distance between droplets and making collisions and agglomeration more likely. This study reveals the characteristics and mechanisms of droplet aerosol agglomeration, providing important theoretical guidance for the effective control of droplets in industrial production processes.

    2025 03 v.39 [Abstract][OnlineView][Download 2149K]

  • Discrete element simulation of binary collision between micron particles in acoustic field

    ZHOU Yinggui;XU Yue;YANG Nana;FAN Fengxian;School of Environmental Science and Engineering, Yancheng Institute of Technology;School of Energy and Power Engineering, University of Shanghai for Science and Technology;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering;

    A discrete element model for binary collision between micron particles in the acoustic field was developed. Based on model validation, evolutions of contact force, overlap distance and particle velocity during collision were investigated. Moreover, influences of the angle between particles′ center-line and wave motion direction as well as the particle radius on collision dynamics were examined. Results show that particles undergo several “compression-rebound” processes before agglomeration and experience only a single process of “compression-rebound”before separation. The larger the particles′ center-line deviates from the wave motion direction, the longer the agglomeration time, particularly, when the particles′ center-line is approximately perpendicular to the wave motion direction, collision between particles cannot occur. As the particle radius increases, the collision consequence transits from agglomeration to separation. The agglomeration time decreases first and then tends to be constant, while the separation time is almost unaffected by the particle radius. The research results can provide a basis for accurate prediction of acoustic particle agglomeration processes.

    2025 03 v.39 [Abstract][OnlineView][Download 1660K]

  • Adsorption separation of p/m-cresol on alkali-treated ZSM-5

    CHEN Guangmin;SUN Yongjie;CHEN Pengfei;LIU Dinghua;LIU Xiaoqin;College of Chemical Engineering, Nanjing Tech University;

    For the adsorption separation ofm/p-cresol isomers, NaZSM-5 molecular sieve with a Si/Al ratio of 50was selected as precursor due to its superior separation factor. Accompanied by alkali-treatment in various concentration NaOH solutions, a series of modified ZSM-5 with hierarchical pores were successfully synthesized. The adsorbents were characterized by N_2 adsorption-desorption and X-ray diffraction(XRD). Static and dynamic adsorption experiments were employed to investigate the adsorption separation performance of such modified ZSM-5 adsorbents, followed by kinetic principles analysis. From the results, compared with the bare molecular sieves, the adsorption rate ofp-cresol on modified ZSM-5 especially that treated by 0.2 mol·L~(-1)NaOH solution at 85 ℃ for 1 h,so-called 0.2-85-1 sample, was greatly enhanced. This improvement could be attributed to the enhanced mass transfer caused by introduced mesopores in 0.2-85-1. In detail, on 0.2-85-1, the adsorption equilibrium time for p-cresol was shortened by 50%, and its maximum adsorption capacity increased by 50%, from 303 kg·m~(-3)·d~(-1)to 454kg·m~(-3)·d~(-1). In addition, according to the kinetic fitting results, the adsorption behaviors ofp-cresol andm-cresol on the 0.2-85-1 were in accordance with pseudo-second-order kinetic model, confirming an order of magnitude increase in adsorption rate after alkali treatment.

    2025 03 v.39 [Abstract][OnlineView][Download 2258K]

  • Mechanistic study on the enhanced adsorption of xylene on sulfur doped carbon nanotube membrane coated paper-like stainless steel fibers

    ZHUANG Chaojun;YAN Ying;School of Chemistry and Chemical Engineering, South China University of Technology;SCUT-Zhuhai Institute of Modern Industrial Innovation;

    Carbon nanotubes( CNT) are widely regarded as effective adsorbents for volatile organic compounds(VOCs) due to their exceptional physical properties. However, the adsorption performance of CNTs is often hindered by mass transfer resistance caused by aggregation effects. Microfiber composites, as a novel structural materials, effectively overcome this limitation. In this study, CNT and sulfur-doped CNT(SCNT) membrane were directly grown on the surface of paper-like sintered stainless steel fibers( PSSF) via chemical vapor deposition( CVD), successfully fabricating CNT/PSSF and SCNT/PSSF composites with gradient porous structures. These composites were thoroughly characterized using SEM, TEM, TG, Raman, FT-IR, and XPS. Adsorption experiments in a fixed-bed reactor demonstrated that SCNT/PSSF exhibited superior dynamic adsorption performance, attributed to the abundant surface defects and acid-base functional groups. By constructing a mixed structured fixed bed with granular CNT bed and SCNT/PSSF bed, the mass transfer enhancement mechanism during xylene adsorption was investigated. Compared to a 5 cm granular CNT bed, the utilization efficiency （ΔZ） of the 4cm granular CNT + 1 cm SCNT/PSSF bed was improved by 8.1%. Additionally, the adsorption process in the structured fixed bed was well-fitted by the Yoon-Nelson model.

    2025 03 v.39 [Abstract][OnlineView][Download 3951K]

  • Building of a separation model of cyclone desander based on boundary layer theory

    ZHANG Hongyi;WANG Jianjun;LIU Zengguang;College of New Energy, China University of Petroleum (East China);

    This study aimed to develop a predictive model for the separation efficiency of a hydrocyclone-based sand separator based on boundary layer theory. Numerical simulations were first employed to calibrate the effective flow rate and effective retention volume of the hydrocyclone, resulting in a formula for calculating residence time. The study then analyzed the forces acting on solid particles in the boundary layer, considering the influence of velocity gradients on particle forces, and derived a radial motion differential equation suitable for the hydrocyclone. Based on these adjustments, a refined separation model for the hydrocyclone was established. Experimental validation results indicate that, for particles larger than 13 μm, the model achieves a relative error of 12%, significantly lower than the 46.5%error predicted by traditional boundary layer theory. This outcome demonstrates a closer alignment with experimental data, offering more precise parameter support for engineering design.

    2025 03 v.39 [Abstract][OnlineView][Download 1589K]

  • Study on enhancement of Acidithiobacillus ferrooxidans biological oxidation process of pyrite by applied electric field

    TAN Ningjie;QI Linfeng;WANG Hanzheng;YU Jinghao;ZHU Minglong;TAN Wensong;ZHANG Xu;Animal cell laboratory, School of Biotechnology, East China University of Science and Technology;

    In order to enhance the process efficiency of metallurgical microbial oxidation of pyrite, this experiment designed and constructed an external electric field microbial electroreactor system, and studied the process characteristics of pyrite biooxidation byAcidithiobacillus ferrooxidansunder external electric field conditions. It mainly includes iron oxidation efficiency, structure and biomass of microbial biofilm, secretion and composition of extracellular polymers, and related electrochemical properties. The results show that under the action of a suitable external electric field, the iron oxidation ability of the bacteria is slightly enhanced, and the pyrite oxidation amount increases by 21.3%; the biofilm structure on the surface of pyrite is more compact, the biomass increases significantly, and the total bacterial volume increases by 0.9 times compared with the control group. During the biooxidation process,the current of the pyrite biooxidation system gradually increases, and the process resistance gradually decreases. The research results propose an effective means to increase the biomass of metallurgical microorganisms,which will provide certain support for the development of industrialized bioleaching technology.

    2025 03 v.39 [Abstract][OnlineView][Download 2369K]

  • Multi-channel aqueous-phase 18F-labeling process based on a digital microfluidic chip

    MIAO Liwei;YAO Qiong;MOU Zhaobiao;CHEN Junwei;JIN Chentao;ZHONG Yan;LI Zijing;WANG Jing;ZHANG Hong;DU Peizhen;HE Qinggang;Colleage of Chemical and Biological Engineering, Zhejiang University;State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics,School of Public Health, Xiamen University;Department of Nuclear Medicine and PET-CT Center of Second Affiliated Hospital of Zhejiang University School of Medicine;

    A small volume multi-channel~(18)F-labeling process based on digital microfluidic chip technology was developed.~(18)F-labeled radioactive compounds were synthesized by this process.Method A digital microfluidic chip (Electrowetting-on-dielectric) made of indium tin oxide glass and Teflon material by laser etching magnetron sputtering technology was used to synthesize~(18)F labeled radiopharmaceuticals through multiple channels.The most suitable synthesis condition was selected by labeling rate and radiochemical yield.The microfluidic chip has a film volume of 10×10 cm,a height of 1.1 mm,six synthetic channels,and a heating range from room temperature to 80℃．The synthesis of multiple channels with different precursor concentrations and different reaction times is realized.The radiochemical conversion rate of the synthesized~(18)F labeled radioactive compound is 96.8%,and the radiochemical purity of the product is greater than 99%.The results demonstrate that compared to traditional radiochemical synthesis methods,EWOD allows for the simultaneous synthesis of radiochemicals in different systems,significantly reducing the time required to optimize synthesis conditions and achieving higher conversion yields.This technology accelerates the transition of new radiocompounds into practical applications.

    2025 03 v.39 [Abstract][OnlineView][Download 1278K]

  • Pressure swing adsorption process with enhanced regeneration by hot purging for hydrogen production from coke oven gas

    XU Junjie;WU Wenling;GUO Weidong;ZHANG Donghui;LI Wenbin;TANG Zhongli;School of Chemical Engineering and Technology, Tianjin University;

    To improve the performance of the pressure swing adsorption hydrogen production process,an eight bed,twenty-four step pressure swing adsorption process with enhanced regeneration by hot purging was proposed.Activated carbon and 5A molecular sieve were used as adsorbents in this process.Based on the adsorption data of each component in the feed gas on the adsorbent,simulation studies were conducted using the commercial software Aspen Adsorption.Suitable operating conditions were determined through numerical simulation analysis of internal temperature,pressure,composition and other state parameters,as well as process performance of the adsorption bed.The research results indicate that the introduction of buffer tanks significantly improves the recovery and productivity capacity of hydrogen;Hot purging enhances the regeneration efficiency of the adsorption bed,thereby improving the purity of hydrogen.The optimal purging gas temperature is 333 K.Compared with traditional processes,the hot purging enhanced regeneration hydrogen production process increases the purity from 98.781 6%to 99.345 6%,the recovery from 85.36%to 86.01%,and the productivity and energy consumption are 2.05 mol·（kg_(ads)·h)~(-1)and16.80 kJ·mol~(-1).

    2025 03 v.39 [Abstract][OnlineView][Download 2171K]

  • Glycerol hydrogenolysis to ethylene glycol on Ru-La/SiO2 catalyst

    HU Yongqiang;GUO Haolin;AN Hualiang;ZHAO Xinqiang;WANG Yanji;Hebei Provincial Key Lab of Green Chemical Technology and Efficient Energy Saving,Hebei University of Technology;

    The hydrogenolysis of glycerol into high-value diols(1,2-propanediol, 1,3-propanediol and ethylene glycol) is very attractive among the routes for glycerol utilization. To improve the selectivity of ethylene glycol, a series of Ru-based catalysts were prepared by impregnation method for the hydrogenolysis of glycerol using metal Ru as the main active component, SiO_2as the carrier, and different metal oxides as promoter. Based on this, the effects of additive kinds and quantities, removal of Cl~-, metal loading amount, reduction atmosphere and reduction temperature on the catalytic performance of the prepared catalysts were investigated. Further, these catalysts were characterized by H_2-TPR, CO_2-TPD, NH_3-TPD, TEM, CO chemisorption and N_2adsorption-desorption. The results revealed that the catalyst Ru-La/SiO_2with Cl~-removal by water washing possessed a superior catalytic performance: the selectivity of ethylene glycol reached 51.4%, and the overall selectivity of diols was 91.3%over RuLa/SiO_2prepared under its suitable conditions. La species can decrease the reduction temperature of Ru and alter the acidity/basicity of the catalyst; the acidity and basicity of the catalyst affect the glycerol conversion and ethylene glycol selectivity, respectively; the particle size of the active metal Ru is negatively correlated with glycerol conversion but positively correlated with ethylene glycol selectivity.

    2025 03 v.39 [Abstract][OnlineView][Download 2020K]

  • Selective cyclohexanol oxidation to cyclohexanone over a Co/In-doped porous carbon via persulfate activation

    YAN Xinlong;HUANG Zhigang;HU Qingxun;FENG Rui;HU Xiaoyan;Jiangsu Province Engineering Research Center of Fine Utilization of Carbon Resources,China University of Mining and Technology;Lanzhou Petrochemical Research Center;

    To address the safety risks related to the storage and transport of oxidants used in the selective oxidation of cyclohexanol to cyclohexanone,where hydrogen peroxide serves as the oxidant,a suggestion is put forth.This involves the establishment of a selective catalytic oxidation system that employs persulfates as the oxidant.Here,Co/In bimetallic doped porous carbon catalyst (Co/In-NC) was prepared using ZIF-9 as a template,and the structure of the catalyst was characterized.The performance and mechanism of Co/In-NC activated peroxydisulfate (PDS) in the selective oxidation of cyclohexanol to produce cyclstigated.The results indicated that the catalyst,at a concentration of 100 mg·L~-o~1hexanone were thoroughly inve,reacted at 60℃for 2 hours,achieving a cyclohe%xanol conversion of 53.3%and cyclohexanone selectivity of 99.4%.Moreover,the selectivity remained above 90after three cycles of the oxidation reaction.The reaction was consistent with the zero-order kinetic model.The reaction proceeded through various reactive oxygen species (ROS) inclu~3ding h~(2+)ydroxyl radicals（·OH),superoxide radicals（·O~-activated the PDS_2),and singlet oxygen (~1O,ensuring high conversion_2).The redox cycles of Co~+/Co/Co~0and In~(3+)/In~0effectively of cyclohexanol to cyclohexanone with high selectivity.

    2025 03 v.39 [Abstract][OnlineView][Download 3036K]

  • Design of a resilient hydrogen supply chain considering facility disruptions

    YANG Mingyang;LIU Linlin;DU Jian;Institute of Chemical Process Systems Engineering, School of Chemical Engineering,Dalian University of Technology;

    In the context of global efforts to reduce carbon emissions and mitigate climate change, hydrogen has become a key energy carrier for China′s transition to a low-carbon economy. Addressing the future allocation of largescale hydrogen, this study established a mixed-integer linear programming model for the design of a resilient hydrogen supply chain. The model performs strategic decisions on technology selection, facility sizing, location, and distribution modes for different stages of the hydrogen supply chain(production, storage, and end-use) while ensuring the demand under normal and disrupted conditions. The model is applied to design the hydrogen supply chain in Beijing-Tianjin-Hebei Urban Agglomeration, with various cases compared in terms of economic and resilience metrics. The results show that the designed resilient hydrogen supply chain only incurs a 4.53%increase in daily cost,while significantly increasing the maximum supply days from 5.6 d to 10 d, highlighting the ability of the proposed approach to enhance supply chain resilience while maintaining economic viability. The model can also provide decision support for hydrogen supply chain planning and design by adjusting the embedded parameters to meet different risk preferences.

    2025 03 v.39 [Abstract][OnlineView][Download 2085K]

  • Modeling and structural optimization of hybrid MED-RO desalination system

    WANG Rui;XU Kechen;SUN Qichao;MAO Yuanhui;ZHANG Weitao;WU Lianying;BAI Wei;YU Bing;WANG Chenhui;China Nuclear Power Engineering Co.Ltd.;College of Chemistry and Chemical Engineering, Ocean University of China;

    In the context of the escalating global energy crisis and climate change,addressing the crisis of freshwater scarcity,a hybrid thermal-membrane desalination system was proposed.Mathematical and economic modeling of reverse osmosis (RO) and multi-effect distillation (MED) seawater desalination was established,and four different coupling process schemes were presented based on energy and material flows.The various coupling process schemes were optimized under winter and summer operating conditions.Comprehensive analysis of the coupling process schemes revealed that under winter conditions,scheme three with an RO to MED water production ratio of 8∶2 was the most economically viable,with a water production cost of 0.81 USD·m~(-3),leading to reductions of 26.3%and13.8%in water production costs compared to standalone RO and MED processes,respectively.Additionally,the process exhibited a high freshwater recovery rate,reaching 65.4%.The hybrid thermal-membrane desalination system process studied can be further integrated with renewable energy sources to achieve improved economic and societal benefits.

    2025 03 v.39 [Abstract][OnlineView][Download 1693K]

  • Industrial process fault detection based on IGA and enhanced D-S evidence theory

    WEI Shujuan;QI Yongsheng;LIU Liqiang;LI Yongting;GAO Xuejin;School of Electric Power, Inner Mongolia University of Technology;Engineering Research Center of Large Energy Storage Technology, Ministry of Education;Center for Intelligent Energy Technology and Equipment Engineering,Inner Mongolia University;No.2 Gas Production Plant, Southwest Oil & Gas Company, SINOPEC;Faculty of Information Technology,Beijing University of Technology;

    To address the challenges of feature extraction in complex industrial process data, the need for fault detection methods to assume prior data distribution types, and the weak generalization capability of fault detection methods, we propose an industrial process fault detection algorithm based on Information Gain Adaptive Feature Selection(IGA) and enhanced D-S(Dempster-Shafer) evidence theory. First, information gain was calculated using a decision tree, and the number of features was adaptively selected by setting a threshold value through cross-validation, achieving data dimensionality reduction and feature extraction. Subsequently, a ternary statistic monitoring group was introduced to achieve linear fault detection, while autoencoders and one-class SVM methods were employed for nonlinear fault detection. Finally, enhanced D-S evidence theory was used to fuse the improved weighted average evidence body through a new comprehensive metric, correcting Basic Probability Assignment(BPA) parameters to obtain the fusion result and more reliable detection results. Verification using data from a chiller unit and the Tennessee Eastman( TE) process indicated that the IGA and enhanced D-S evidence theory method achieved higher accuracy and robustness than standalone linear or nonlinear detection algorithms. Moreover, its application does not depend on specific data distribution assumptions, making it versatile and effectively applicable in industrial process fault detection.

    2025 03 v.39 [Abstract][OnlineView][Download 4167K]

  • Crystallization,fluorine distribution and surface properties of block copolymers containing fluorinated acrylate

    LUO Ziqi;CHEN Jiang;YANG Xiaobo;SONG Jinxing;WANG Xiaojun;BAO Yongzhong;College of Chemical and Biological Engineering, State Key Laboratory of Chemical Engineering,Zhejiang University;Zhejiang Transfar Functional New Materials Ltd.Co.;Transfar Zhilian Ltd.Co.;

    Studies on the crystallization, elemental fluorine distribution and surface properties of fluorinated acrylate copolymers would provide a basis for the development of highly hydrophobic and oleophobic coatings. Block copolymers consisting of poly( fluoroacrylate-co-stearyl acrylate) and non-fluorinated polymer chain segments were prepared by iodine transfer miniemulsion polymerization, and effects of block copolymer compositions and the heat treatment conditions on the crystallization, surface fluorine enrichment, and hydrophobicity and oleophobicity were investigated. The results show that block copolymers containing stearyl acrylate and fluoroacrylate with C8-dominated fluorinated alkyl random copolymer segments or perfluorohexylethyl acrylate-stearyl acrylate random copolymer segments all exhibit crystallization and surface fluorine-enriched properties, and form a “peaks and valleys” rough structure on the surface. The surface enrichment of elemental fluorine increases with the increase of the chain motility of copolymers and heat treatment temperature. The increase in the content of non-fluorinated chain segments decreases the crystallization ability of block copolymers and enhances the micro-phase separation. Thus, block copolymers with suitable block ratios would exhibit better integrated hydrophobicity and oleophobicity than fluorinated acrylate-stearyl acrylate random copolymers.

    2025 03 v.39 [Abstract][OnlineView][Download 2074K]

  • Synthesis of intrinsic flame-retardant polymers incorporating sulfur via anionic hybrid copolymerization

    ZHANG Jikai;HUANG Jinfeng;YANG Hongjun;School of Materials Science and Engineering, Changzhou University;Changzhou University Huaide College;

    Sulfur (S_8) is an inevitable byproduct arising from the refinement of petroleum and purification of natural gas.Its surplus capacity has resulted in significant environmental pollution and safety concerns.Direct conversion of S_8into polymeric materials offers a sustainable solution to this excess capacity.Here,sulfur-containing polymer,P(S-BMI),was successfully prepared by one-step anionic hybrid copolymerization ofN,N'-(4,4'-methylenediphenyl) bismaleimide (BMI) with S_8at room temperature.Fourier Transform Infrared Spectroscopy (FTIR)and X-ray Photoelectron Spectroscopy (XPS) showed that the copolymer P (S-BMI) with crosslinked structures contained sulfur in the range of 25%～40%.Typical tensile testing showed that P(S-BMI) exhibited the max tensile strength of 36.5 MPa,and could be reprocessed.Furthermore,P(S-BMI) achieved the highest“V-0”rating in the UL-94 flame-retardancy test,which could be attributed to a synergistic effect combining gas phase isolation and free radical quenching during combustion.This work demonstrates a novel approach for the sustainable utilization of elemental sulfur and provides a pathway towards the development of high-performance,flame-retardant polymers,advancing both environmental sustainability and materials science.

    2025 03 v.39 [Abstract][OnlineView][Download 1991K]

  • Preparation and photocatalytic/antibacterial properties of CuO/TiO2/ZSM-5 composite material

    LIU Siqi;WANG Lipeng;DU Fuling;YU Qianru;LIANG Xinchao;WANG Cheng;School of Material Science and Engineering, Shaanxi University of Science and Technology;Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials;

    In order to improve the visible photocatalytic and antibacterial properties of TiO_2/ZSM-5,CuO/TiO_2/ZSM-5 composites with visible photocatalytic and antibacterial properties were prepared by impregnation-calcination method using Cu(NO_3)_2,Ti(SO_4)_2 and ZSM-5 as raw materials.X-ray diffraction analyzer (XRD),X-ray photoelectron spectrometer (XPS),gas adsorption instrument,scanning electron microscopy-energy spectrometer (SEM-EDS),UV-visible diffuse reflection spectrometer (UV-Vis DRS),X-ray fluorescence spectrometer (PL),electron paramagnetic resonance spectrometer (EPR) and inductively coupled plasma emission spectrometer (ICP) were used to characterize the composition of the material.The photocatalytic property of the material was evaluated by methyl orange solution,and the antibacterial property of the material was evaluated byEscherichia coliandStaphylococcus aureus.The results show that the CuO/TiO_2/ZSM-5 composites with high specific surface area and pore volume can be synthesized by impregnation-calcination method.When the molar ratio of CuO/TiO_2 is 0.5%,the asprepared 0.5 CuO/TiO_2/ZSM-5 sample has a relatively lower electron-hole recombination rate,a wide photoresponse range,and a high production amount of active species such as·O_2~- and·OH,and exhibiting excellent photocatalytic and antibacterial properties.The removal rate of methyl orange reaches 95% after 150 min illumination under xenon lamp,and the antibacterial rates ofEscherichia coliandStaphylococcus aureusreach 75.2% and 83.3%,97.6% and 98.5% under dark condition and illumination for 5 min,respectively.

    2025 03 v.39 [Abstract][OnlineView][Download 2890K]

  • Removal of organic nitrogen from wastewater by electrochemical oxidation:Reaction conditions and process optimization

    YANG Yang;ZHANG Honghua;WANG Chenyang;SONG Fangye;College of Chemical Engineering, Zhejiang University of Technology;Hangzhou Kunhong Environmental Technology Co.Ltd.;

    In order to reduce environmental impact of the organic pollutantN,N-dimethylformamide (DMF) emitted by industrial production,an electrochemical oxidation method was employed for DMF degradation.The effects of four independent factors (current density,pad spacing,pH and initial chloride ion concentration) on DMF degradation were investigated by single-factor experiments.The optimal experimental conditions were as follows:the current density was 40 mA·cm~(-2),the pH was 6,the pad spacing was 2 cm,and the initial chloride mass concentration was 2.34 g·L~(-1).Flow electrolysis was used to optimize and improve the device,and the specific effects of various parameters on the DMF removal rate were investigated.The results indicate that the reaction rate significantly improves with increasing flow circulation times.When the circulation reaches 30 times,the removal efficiency of DMF ultimately achieves 93.68%.

    2025 03 v.39 [Abstract][OnlineView][Download 1481K]

  • Preparation and dye adsorption property of genistein-based cyclomatrix polyphosphazene

    LIU Ruyue;BAI Feifei;MA Jingyi;SONG Yujie;LI Jinjin;ZHAO Ling;XI Zhenhao;School of Chemical Engineering, East China University of Science and Technology;

    A bio-based polyphosphazene adsorption material abbreviated as HGES was synthesized by ultrasonic-assisted one-step precipitation polymerization of hexachlorocyclotriphosphonitrile (HCCP),genigenitin (GEN) and4,4′-dihydroxydiphenyl disulfide (HPS).Fourier transform infrared spectrometer (FTIR) and X-ray diffraction (XRD) spectra demonstrated that nucleophilic substitution reaction occurred between—Cl of HCCP and—OH of GEN and HPS,and the synthesized HGES was amorphous.Scanning electron microscope (SEM) images showed that HGES particles were spherical and have an average particle size of about 254 nm.The average Zeta potential of HGES measured by dynamic light scattering (DLS) was-286 mV.Research results show that HGES can effectively adsorb cationic dyes in water.The removal rate of MB by HGES can reach 100%within 30 min.The adsorption kinetics of HGES to methylene blue is consistent with the quasi-second-order model,the adsorption isotherm is consistent with the D-R model,and the saturated adsorption capacity is 52.64 mg·g~(-1).

    2025 03 v.39 [Abstract][OnlineView][Download 1856K]

  • Organic amine chemiluminescence detection technology based on novel microfluidic chips

    LI Wen;GUO Qi;LIU Ying;WANG Enhong;LI Dejian;School of Mechanical and Material Engineering, North China University of Technology;

    In recent years, the levels of organic amines in industrial wastewater and domestic sewage discharges have commonly surpassed the allowable limits. This has not merely exacerbated water pollution but has also exerted a severe influence on human health. Within the scope of current research, considering the issues like substantial reagent consumption, intricate detection procedures, and high costs associated with conventional methods for determining organic amines, a novel chemiluminescence detection technique for organic amines based on a new type of microfluidic chip was put forward. The microchannels of the chip with a compound structure were devised, and comprehensive design research was conducted from multiple aspects, namely mechanism analysis, chip fabrication, system design, and experimental validation. Experimental results demonstrated that during a 60-second test, the output voltage remained stable at 173 mV, with an error margin less than 2.4 mV. The experiment validated the feasibility of the detection system. The research on the chemiluminescence detection technology of organic amines has furnished technical backing for water environment detection and holds a certain degree of promotional worth.

    2025 03 v.39 [Abstract][OnlineView][Download 1774K]