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Activated carbon supported TiO_2 -photocatalysis doped with Fe ions for continuous treatment of dye wastewater in a dynamic reactor

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Journal of Environmental Sciences 2010年第8期22卷 1290-1296页

作者： Youji Li Jun Chen Jianben Liu Mingyuan Ma Wei Chen Leiyong Li College of Chemistry and Chemical Engineering Jishou University Jishou 416000 China

Fe-doped TiO 2 coated on activated carbon （Fe-TiO 2 /AC, FTA） composites were prepared by an improved sol-gel method and characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, inductively coupled plasma mass spectrometry and BET surface area analysis. Obtained FTA composites were applied to the continuous treatment of dye wastewater in a dynamic reactor. The effects of Fe ion content, catalyst content, UV-lamp power and flowrate of the continuous treatment of dye wastewater on degradation efficiency were analyzed to determine the optimum operating conditions of dye wastewater degradation. Continuous photocatalytic experiments provided interesting results that FTA had a high chemical oxygen demand （COD） removal rate compared with TiO 2 , Fe doped TiO 2 （FT） and TiO 2 coated on activated carbon （TA）. In particular, when using the FTA catalyst with a Fe ion content of 0.33%, the kinetic content （k = 0.0376） of COD removal was more than the sum of both TA （0.0205） and 0.33% FT （0.0166）. FTA showed a high photoactivity because of a synergistic effect between Fe ions and AC on TiO 2 , which is higher than the individual effects of AC or Fe ions on TiO 2 . Additionally, for the photocatalytic degradation of dye wastewater, the optimum Fe ion content, catalyst content, UV-lamp power and flowrate were 0.33%, 6 g/L, 60 W （two lamps） and 300 mL/hr, respectively. An investigation of catalyst reuse revealed that the 0.33% FTA showed almost no deactivation in photocatalytic degradation of naturally treated wastewater.

关键词： titanium dioxide iron ions activated carbon dye wastewater continuous treatment

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Application of electrode materials and catalysts in electrocatalytic treatment of dye wastewater

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Frontiers of Chemical Science and Engineering 2021年第6期15卷 1427-1443页

作者： Weihang Sun Dongfang Liu Minghui Zhang College of Environmental Science and Engineering Nankai UniversityTianjin300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin300071China

The dye industry produces a large amount of hazardous wastewater every day worldwide,which brings potential threaten to the global environment.As an excellent method for removal of water chroma and chemical oxygen demand,electrocatalytic methods are currently widely used in the treatment of dye wastewater.The selection and preparation of electrode materials and electrocatalysts play an important role on the electrocatalytic treatment.The aim of this paper is to introduce the most excellent high-efficiency electrode materials and electrocatalysts in the field of dye wastewater treatment.Many electrode materials such as metal electrode materials,boron-doped diamond anode materials and three-dimensional electrode are introduced in detail.Besides,the mechanism of electrocatalytic oxidation is summarized.The composite treatment of active electrode and electrocatalyst are extensively examined.Finally,the progress of photo-assisted electrocatalytic methods of dye wastewater and the catalysts are described.

关键词： electrocatalytic oxidation electrode electrocatalysis dye wastewater

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High flux photocatalytic self-cleaning nanosheet C_(3)N_(4) membrane supported by cellulose nanofibers for dye wastewater purification

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Nano Research 2021年第8期14卷 2568-2573页

作者： Lilong Zhang Ge Meng Guifang Fan Keli Chen Yulong Wu Jian Liu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China The Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityJilin 130012China Department of Chemistry Tsinghua UniversityBeijing 100084China School of Chemical Engineering and Technology Xinjiang UniversityUrumqi 830046China College of Materials Science and Engineering Qingdao University of Science and Technology Qingdao 266042China

Hazardous dye substances discharged from the textile and dyestuff industries not only threaten local the surrounding ecosystems but are also hard to degraded.We report the preparation of process for a photocatalytic membrane device that can degrade dye pollution under visible light.This filtration membrane,with a well-organized multilayer structure,simultaneously achieves continuous and flow-through separation of degradation products.Cellulose nanofibers(CNFs)were used as a template for nanosheet C_(3)N_(4)(NS C_(3)N_(4))preparation;the performance for the photocatalytic degradation of dyes improved as the morphology changed from bulking to nanosheet.NS C3N4 was then attached to the surface of a prepared CNF membrane via vacuum filtration.This device exhibited high efficiency(the degradation rates of both Rhodamine B and Methylene blue both reached 96%),high flux(above 160 L·h^(-1)·m^(-2)·bar^(-1))and excellent stability(maintaining steady flux and high separation were maintained after 4 h).This easy-preparation,easy-scale-up,and low-cost process provides a new method of fabricating photocatalytic membrane devices for dye wastewater treatment.

关键词： high flux nanofibers nanosheet C_(3)N_(4) photocatalytic membrane dye wastewater

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Degradation of dye wastewater by Pulsed High-Voltage Discharge Combined with Spent Tea Leaves

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Plasma Science and Technology 2014年第12期16卷 1135-1140页

作者：刘燕杨丽杨刚张延宗张小洪邓仕槐 Agricultural Environmental Engineering Center of Sichuan Province College of Resources &EnvironmentSichuan Agricultural University

Degradation of methylene blue （MB） was performed using the pulsed discharge process （PDP） combined with spent tea leaves （STLs）. The effects of STL dosage, concentration of initial solution, and pH were analyzed in the combined treatment. Results showed that the combined treatment was effective for dye wastewater degradation; when the dosage of STLs was 3.2 g/L, the degradation efficiency reached 90% after 15 rain treatment, and STLs showed a good repeatability. The degradation rate decreased with increasing initial MB concentration but not related to the solution pH in the combined treatment. Fourier-transform infrared spectra and N2 adsorption suggested that the number of acidic and basic groups in the STL surface increased after the treatment, but the surface area and pore volume remained unchanged.

关键词： pulsed discharge spent tea leaves dye wastewater degradation

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Treatment of dye wastewater by Using a Hybrid Gas/Liquid Pulsed Discharge Plasma Reactor

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Plasma Science and Technology 2012年第2期14卷 162-166页

作者：鲁娜李杰吴彦佐藤正之 Institute of Electrostatics and Special Power Dalian University of Technology Department of Chemical&Environmental Engineering Faculty of EngineeringGunma University

A hybrid gas/liquid pulsed discharge plasma reactor using a porous ceramic tube is proposed for dye wastewater treatment. High voltage pulsed discharge plasma was generated in the gas phase and simultaneously the plasma channel was permeated through the tiny holes of the ceramic tube into the water phase accompanied by gas bubbles. The porous ceramic tube not only separated the gas phase and liquid phase but also offered an effective plasma spreading channel. The effects of the peak pulse voltage, additive gas varieties, gas bubbling rate, solution conductivity and TiO2 addition were investigated. The results showed that this reactor was effective for dye wastewater treatment. The decoloration efficiency of Acid Orange II was enhanced with an increase in the power supplied. Under the studied conditions, 97% of Acid Orange II in aqueous solution was effectively decolored with additive oxygen gas, which was 51% higher than that with argon gas, and the increasing 02 bubbling rate also benefited the decoloration of dye wastewater. Water conductivity had a small effect on the level of decoloration. Catalysis of TiO2 could be induced by the pulsed discharge plasma and addition of TiO2 aided the decoloration of Acid Orange II.

关键词： pulsed discharge plasma porous ceramic tube dye wastewater decoloration

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Treatment of dye wastewater by Nano-ferrous Modified Bentonite Assisted Advanced Oxidation Processes

Treatment of Dye Wastewater by Nano-ferrous Modified Bentoni...

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2012 International Conference on Nanotechnology Technology and Advanced Materials(ICNTAM 2012)

作者： Mindong Zhang Yanfei Wei Mei Huang Department of Chemical & Biochemical Engineering Zhejiang University Environmental Science Research & Design Institute of Zhejiang Province

Degradation of dye wastewater was studied by using nano-ferrous modified bentonite as the heterogeneous catalyst for a Fenton-like oxidation. By comparing the effect of homogeneous Fenton reactions as well as heterogeneous Fenton-like process for nano-modified bentonite, it is found that the advanced oxidation processes assisted by nano-ferrous/bentonite complexes exhibit the stronger degradation capacity. And the removal rate of Fenton-like reaction increased from 23.6% to 75.5% when the ferrous concentration increasing from 20 to 100mmol/L. Being compared with homogeneous Fenton reactions, 20% increased degradation efficiencies is obtained by Fenton-like oxidation process for nano-modified bentonite under 6g nano-ferrous/bentonite complexes in 100 m L dye wastewater.

关键词： nano-ferrous/bentonite complexes dye wastewater advanced oxidation processes Fenton-like reaction

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Durable and recyclable BiOBr/silk fibroin-cellulose acetate composite film for efficient photodegradation of dyes under visible light irradiation

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1765-1775页

作者： Jialiang Xu Jian Jian Yixiao Dan Jie Song Lingxi Meng Pei Deng Weijie Sun Yusheng Zhang Jinhua Xiong Zhengqiu Yuan Hu Zhou School of Chemistry and Chemical Engineering Hunan Engineering Research Center for Functional Film MaterialsHunan University of Science and TechnologyXiangtan 411201China School of Chemical Engineering Post Doctoral Mobile Station in ChemistryXiangtan UniversityXiangtan 411105China Post Doctoral Research Workstation Anhui Huaxing Chemical Industry Co.Ltd.Hexian 238251China

A stable and recyclable of BiOBr/silk fibroincellulose acetate composite film was prepared by blendingwet phase transformation and in situ precipitate technology.The cellulose acetate film modified by silk fibroin formed a finger-shaped porous structure,which provided a large space for the uniform growth of BiOBr nanosheets and facilitated the shuttle flow of dyes in film.The morphology,phase structure,and optical properties of the composite films were characterized using various techniques,and their photocatalytic performance for dye wastewater was evaluated under visible light irradiation.Results showed that the BiOBr/SF-CA composite film exhibited efficient photocatalytic activity with 99.9%of rhodamine B degradation rate.Moreover,the composite film maintained high catalytic stability because Bi as the active species deposited on the film showed almost no loss.Finally,the possible photocatalytic mechanisms in the BiOBr/SF-CA composite film were speculated through radical-trapping experiments and electron spin resonance testing.

关键词： BiOBr nanosheet cellulose acetate silk fibroin photocatalytic degradation dye wastewater

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Efficient Fe（Ⅲ）/Fe（Ⅱ） cycling triggered by MoO2 in Fenton reaction for the degradation of dye molecules and the reduction of Cr（Ⅵ）

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Chinese Chemical Letters 2019年第12期30卷 2205-2210页

作者： Bin Shen Chencheng Dong Jiahui Ji Mingyang Xing Jinlong Zhang Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology

There is a relatively low efficiency of Fe(Ⅲ)/Fe(Ⅱ) conversion cycle and H2 O2 decomposition(<30%) in conventional Fenton process,which further results in a low production efficiency of ·OH and seriously restricts the application of Fenton.Herein,we report that the commercial MoO2 can be used as the cocatalyst in Fenton process to dramatically accelerate the oxidation of Lissamine rhodamine B(L-RhB),where the efficiency of Fe(Ⅲ)/Fe(Ⅱ) cycling is greatly enhanced in the Fenton reaction meanwhile.And the L-RhB solution could be degraded nearly 100% in 1 min in the MoO2 cocatalytic Fenton system under the optimal reaction condition,which is apparently better than that of the conventional Fenton system(~50%).Different from the conventional Fenton reaction where the ’OH plays an important role in the oxidation process,it shows that 1 O2 contributes most in the MoO2 cocatalytic Fenton reaction.However,it is found that the exposed Mo^4+ active sites on the surface of MoO2 powders can greatly promote the rate-limiting step of Fe^3+/Fe^2+ cycle conversion,thus minimizing the dosage of H2 O2(0.400 mmol/L) and Fe^2+(0.105 mmol/L).Interestingly,the MoO2 cocatalytic Fenton system also exhibits a good ability for reducing Cr(Ⅵ) ions,where the reduction ability for Cr(Ⅵ) reaches almost 100% within 2 h.In short,this work shows a new discovery for M002 cocatalytic advanced oxidation processes(AOPs),which devotes a lot to the practical water remediation application.

关键词： Fenton reaction Co-catalytic Molybdenum dioxide Fe^3+/Fe^2+conversion dye wastewater

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Active Stainless Steel/SnO_2-CeO_2 Anodes for Pollutants Oxidation Prepared by Thermal Decomposition

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Journal of Materials Science & Technology 2010年第2期26卷 187-192页

作者： Jiangang Zhang Yunpeng Wei Guangjian Jin Gang Wei College of Materials Science and Engineering Beij-ing University of ChemiCal Technology Beijing 100029 China Beijing Eau Tech Co. Ltd. Beijing 100101 China

Stainless steel plates were successfully coated with SnO2-CeO2 films （SS/SnO2-CeO2） by brush coating with a solution of stannous chloride and cerium trichloride followed by thermal decomposition. It is proven that the properties of SnO2 films can be evidently improved by Ce doping, and 600℃ is the optimum temperature to prepare SS/SnO2-CeO2 anodes. The physicochemical and electrochemical properties as well as the elec- trocatalytic activity of the electrodes were investigated. It is found that the novel electrodes have compact microstructure, high overpotential for oxygen evolution （1.60 V vs SCE）, excellent electrochemical stability, relatively low cost and excellent catalytic activity for oxidizing pollutants. An industrial dye wastewater, which is hard to be purified by using conventional chemical flocculation methods, was oxidated by employing the SS/SnO2-CeO2 anodes, and 83.00% of color and 48.62% of chemical oxygen demand （COD） removal was achieved under the cell voltage of 5 V within only 2 min, and the electricity consumption is only 1.83 kWh for oxidizing I m3 of dye wastewater.

关键词： SnO2-CeO2 anodes Stainless steel Electrochemical oxidation dye wastewater

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Treatment of wastewater with High Conductivity by Pulsed Discharge Plasma

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Plasma Science and Technology 2014年第7期16卷 688-694页

作者：王兆均姜松刘克富 Institute for Electric Light Sources Fudan University

A wastewater treatment system was established by means of pulsed dielectric barrier discharge（DBD）. The main advantage of this system is that the wastewater is employed as one of the electrodes for the degradation of rhodamine B, which makes use of the high conductivity and lessenes its negative influence on the discharge process. At the same time, the reactive species like ozone and ultraviolet（UV） light generated by the DBD can be utilized for the treatment of wastewater. The effects of some factors like conductivity, peak pulse voltage, discharge frequency and pH values were investigated. The results show that the combination of these reactive species could enhance the degradation of the dye while the ozone played the most important role in the process. The degradation efficiency was enhanced with the increase of energy supplied. The reduction in the concentration of rhodamine B was much more effective with high solution conductivity;under the highest conductivity condition, the degradation rate could rise to 99%.

关键词： dielectric barrier discharge dye wastewater ozone degradation conductivity

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