Ti/SnO_2-Sb阳极-空气阴极电催化降解染料废水
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摘要
为解决电化学法处理高盐染料废水存在的能耗大、成本高等问题,分别采用溶胶-凝胶法和辊压法制备Ti/SnO_2-Sb阳极和空气阴极,构建了Ti/SnO_2-Sb阳极-空气阴极双极体系(TSSA-ADC)。甲基橙(MO)作为高盐染料废水的典型污染物,考察了电流强度、MO浓度、电解液浓度和初始p H对TSSA-ADC体系和TSSA单阳极体系降解MO的影响。结果表明:与TSSA单阳极体系相比,TSSA-ADC体系具有更好的抗有机负荷冲击、抗盐分冲击、抗酸碱波动能力,能够维护酸碱平衡防止硬度离子结垢。最佳反应条件为电流强度为0.030 A,电解液浓度为3%,MO浓度为100 mg/L,初始pH=6。以MO去除率达到98%为基准,TSSA-ADC体系比TSSA体系可节能74.26%。
Electrochemical technology for dye pollutant purification from high salinity wastewater are sufferring from high cost and energy consumption. To overcome these problems,a Ti/SnO_2-Sb anode( TSSA)-air diffusion cathode( TSSA-ADC)system was established,where the anode was prepared by a sol-gel method and the air cathode was prepared by a rolling method. By using methyl orange( MO) as the target pollutant,the influence of the operational parameters,including current intensity,initial MO concentration,electrolyte concentration and initial p H,were investigated. The results showed that the TSSA-ADC system possessed higher resistivity to the fluctuation of organic load,salt,acid and alkali and had stronger ability in anti-scaling than the TSSA system. The optimal MO removal effect was obtained with 100 mg/L MO in 3% Na Cl solution at the current of 0. 03 A as well as initial p H value of 6. As to the MO removal efficiency of 98%,the energy consumption was reduced by 74. 26% in the TSSA-ADC system compared to the TSSA system.
Electrochemical technology for dye pollutant purification from high salinity wastewater are sufferring from high cost and energy consumption. To overcome these problems,a Ti/SnO_2-Sb anode( TSSA)-air diffusion cathode( TSSA-ADC)system was established,where the anode was prepared by a sol-gel method and the air cathode was prepared by a rolling method. By using methyl orange( MO) as the target pollutant,the influence of the operational parameters,including current intensity,initial MO concentration,electrolyte concentration and initial p H,were investigated. The results showed that the TSSA-ADC system possessed higher resistivity to the fluctuation of organic load,salt,acid and alkali and had stronger ability in anti-scaling than the TSSA system. The optimal MO removal effect was obtained with 100 mg/L MO in 3% Na Cl solution at the current of 0. 03 A as well as initial p H value of 6. As to the MO removal efficiency of 98%,the energy consumption was reduced by 74. 26% in the TSSA-ADC system compared to the TSSA system.
引文
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[2]陈婵维,付忠田,于洪蕾,等.染料废水处理技术进展[J].环境保护与循环经济,2010,30(4):37-40.
[3]姚颖悟,王育华,唐宝华,等.钛基锡锑氧化物涂层电极的研究进展[J].电镀与涂饰,2011,30(10):54-56.
[4]董恒.基于活性炭的低成本、高性能微生物燃料电池空气阴极研究[D].天津:南开大学,2013:17-177.
[5]Yu H,Li Y,Zhao M,et al.Energy-saving removal of methyl orange in high salinity wastewater by electrochemical oxidation via a novel Ti/Sn O2-Sb anode:Air diffusion cathode system[J].Catalysis Today,2015,258:156-161.
[6]Mauro Epifani,Alvisi M,Mirenghi L,et al.Sol-gel processing and characterization of pure and metal-doped Sn O2,thin films[J].Journal of the American Ceramic Society,2001,84(1):48-54.
[7]Goyal R N,Chatterjee S,Agrawal B.The effect of the addition of colloidal iridium oxide into sol-gel obtained titanium and ruthenium oxide coatings on titanium on their electrochemical properties[J].Physical Chemistry Chemical Physics Pccp,2010,12(27):7521-7528.
[8]Panic V V,Nikolic B Z.Electrocatalytic properties and stability of titanium anodes activated by the inorganic sol-gel procedure[J].Journal of the Serbian Chemical Society,2008,73(11):1083-1112.
[9]Benrabah B,Bouaza A,Kadari A,et al.Impedance studies of Sb doped Sn O2,thin film prepared by sol gel process[J].Superlattices&Microstructures,2011,250(6):591-600.
[10]Dong H,Yu H B,Wang X,et al.A novel structure of scalable air-cathode without Nafion and Pt by rolling activated carbon and PTFE as catalyst layer in microbial fuel cells[J].Water Research,2012,46(17):5777-5787.
[11]Dong H,Yu H B,Wang X.Catalysis kinetics and porous analysis of rolling activated carbon-PTFE air-cathode in microbial fuel cells[J].Environmental Science&Technology,2012,46(23):13009-13015.
[12]Wang Q,Dong H,Yu H.Development of rolling tin gas diffusion electrode for carbon dioxide electrochemical reduction to produce formate in aqueous electrolyte[J].Journal of Power Sources,2014,271:278-284.
[13]Le T X H,Bechelany M,Lacour S,et al.High removal efficiency of dye pollutants by electron-Fenton process using a graphene based cathode[J].Carbon,2015,94:1003-1011.
[14]Chen J Y,Li N,Zhao L.Three-dimensional electrode microbial fuel cell for hydrogen peroxide synthesis coupled to wastewater treatment[J].Journal of Power Sources,2014,254(15):316-322.
[15]吴海燕.单线态氧与不饱和化合物的反应及其过氧化物的化学发光研究[D].无锡:江南大学,2012:1-4.