废水中甲基橙的电化学降解
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摘要
以FTO导电玻璃作为阳极、石墨电极作为阴极电解模拟甲基橙废水,优化了工艺条件,并对甲基橙的降解机理进行了初步探究。实验结果表明,在NaCl投加量5 g/L、电压8 V、废水pH 6、初始甲基橙质量浓度6.0 mg/L的优化条件下电解30 min,废水的脱色率达91.3%,COD降低了62%。机理研究结果表明,电解产生的羟基自由基与甲基橙发生氧化还原反应,破坏了甲基橙的显色基团,使其内部某些化学键发生断裂,从而达到脱色的目的。
The simulated methyl orange wastewater was electrolyzed with FTO conductive glass as the anode and a graphite electrode as the cathode. The technological conditions were optimized,and the degradation mechanism of methyl orange was preliminarily discussed. The experimental results showed that the decoloration rate was up to 91.3%and the COD was reduced by 62% in wastewater after electrolyzation for 30 minutes under the optimized conditions of NaCl amount 5 g/L,voltage 8 V,wastewater pH 6 and initial mass concentration of methyl orange 6.0 mg/L. The results of mechanism study indicated that the redox reaction took place between the methyl orange and the hydroxyl radicals generated by electrolysis,which destroyed the chromophoric group of methyl orange and resulted in the breakage of some chemical bonds in it,so as to achieve the decolorization.
The simulated methyl orange wastewater was electrolyzed with FTO conductive glass as the anode and a graphite electrode as the cathode. The technological conditions were optimized,and the degradation mechanism of methyl orange was preliminarily discussed. The experimental results showed that the decoloration rate was up to 91.3%and the COD was reduced by 62% in wastewater after electrolyzation for 30 minutes under the optimized conditions of NaCl amount 5 g/L,voltage 8 V,wastewater pH 6 and initial mass concentration of methyl orange 6.0 mg/L. The results of mechanism study indicated that the redox reaction took place between the methyl orange and the hydroxyl radicals generated by electrolysis,which destroyed the chromophoric group of methyl orange and resulted in the breakage of some chemical bonds in it,so as to achieve the decolorization.
引文
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[2]何炽,赵景连,夏敏强,等.分子筛固载Fe2+-Fenton法降解水中甲基橙的研究[J].环境科学与技术,2006,29(12):1-3.
[3]常海,吕效平.超声降解四氯化碳与甲基橙混合废水的研究[J].高校化学工程学报,2011,25(1):155-160.
[4]郑文轩,杨瑛.超声与活性炭降解甲基橙溶液的研究[J].安徽农业科学,2010,38(36):20533-20534,20565.
[5]白春华,徐志永,李光辉,等.纳米TiO2/硅藻土复合材料光催化降解甲基橙的研究[J].应用化工,2017,46(4):701-705.
[6]王洁,王莉琼,曹江平,等.WO3/BiOBr复合催化剂的制备及可见光催化降解甲基橙[J].工业催化,2017,25(11):44-47.
[7]许茂东,宋慧,胥佳斌,等.Cu2+-TiO2/偕胺肟纤维的制备及其光催化降解性能[J].环境工程学报,2016,10(7):3647-3652.
[8]阿旺次仁,李红娜,唐哲仁,等.以一种黏土矿物材料为非均相类芬顿催化剂对甲基橙的降解[J].环境科学研究,2017,30(11):1769-1776.
[9]高磊,陈宏,李立青.Fenton氧化法降解甲基橙溶液的研究[J].西南大学学报(自然科学版),2010,32(5):115-119.
[10]王帅军,董培,崔爱玲,等.MCM-41分子筛负载铁铈催化降解甲基橙[J].化工环保,2015,35(6):651-655.
[11]秦聪丽,傅吉全.植物法改性类Fenton反应催化剂降解甲基橙[J].化工环保,2016,36(3):312-316.
[12]刘自力,秦祖赠,孙建华,等.高压放电降解甲基橙废水的研究[J].广州大学学报(自然科学版),2008,7(2):1-5.
[13]汪涵.电化学技术在环保领域的应用[J].化工环保,2005,25(5):361-363.
[14]孙广垠,宋萌.低温等离子体技术降解甲基橙染料废水[J].中国给水排水,2016,32(21):96-99.
[15]黄兴华,王黎明,关志成,等.电化学法处理染料废水的研究[J].高压电器,2002,38(5):22-23,26.
[16]陈毅挺,黄露,林棋.苋菜红在掺杂氟的二氧化锡导电玻璃上的电化学降解[J].环境化学,2011,30(11):1871-1876.
[17]王艳,任衍燕,郝春燕,等.掺锑二氧化锡电极光电催化降解甲基橙的研究[J].太原科技大学学报,2009,30(4):350-354.
[18]丁徐红,杨丽琴,朱定成.不锈钢基PbO2电极电催化氧化降解甲基橙性能的研究[J].化学工程师,2009(11):36-38,58.
[19]张惠灵,胡春华,徐亮,等.钛基二氧化铅电极的制备及其对甲基橙的降解[J].环境科学与技术,2007,30(9):28-30,38.
[20]孙墨杰,王小青,贾若琨.纳米TiO2的制备及其光催化降解甲基橙[J].东北电力大学学报,2010,30(1):35-38.
[21]王雪林,奚正楷,杨茹,等.甲基橙的光谱电化学研究[J].物理化学学报,1994,10(7):639-643.
[22]TIAN J T,WANG J F,DAI J H,et al.N-doped TiO2/ZnO composite powder and its photocatalytic performance for degradation methyl orange[J].Surf Coat Technol,2009,204(5):723-730.