La掺杂钛基氧化物电极降解水中2,4-二氯酚的研究
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摘要
以稀土La掺杂的钛基氧化物(Ti/SnO_2+Sb_2O_3/PbO_2)为阳极,不锈钢板为阴极,Na_2SO_4作支持电解质,降解水中2,4-DCP。研究了pH大小,电流密度,电解质浓度,La掺杂量以及电化学反应时间对2,4-DCP降解的影响,确定了最佳的处理条件。研究结果表明:La掺杂钛基氧化物电极对水中的2,4-DCP有良好的降解效果;在中性的条件下,降解效果较好;电流越大,降解率越高;电解质的浓度对降解率影响较小;适量掺杂La可有效提高2,4-DCP的降解率。
Ti-based oxide electrodes doped with La was used to degrade 2, 4-DCP in wastewater, in which Na_2SO_4 was used as supporting electrolyte. The effects of pH, current density, electrolyte concentration, La doping and electrochemical reaction time on the degradation of 2, 4-DCP were studied, and the optimum processing conditions were determined. The results show that Ti-based oxide electrodes with La-doping had good degradation effect on 2, 4-DCP. The degradation rate was better under pH 5-7, and the greater the current was, the higher the degradation rate was. The degradation rate was less affected by the electrolyte concentration. The right amount of La-doping could effectively improve the degradation rate of 4-DCP.
Ti-based oxide electrodes doped with La was used to degrade 2, 4-DCP in wastewater, in which Na_2SO_4 was used as supporting electrolyte. The effects of pH, current density, electrolyte concentration, La doping and electrochemical reaction time on the degradation of 2, 4-DCP were studied, and the optimum processing conditions were determined. The results show that Ti-based oxide electrodes with La-doping had good degradation effect on 2, 4-DCP. The degradation rate was better under pH 5-7, and the greater the current was, the higher the degradation rate was. The degradation rate was less affected by the electrolyte concentration. The right amount of La-doping could effectively improve the degradation rate of 4-DCP.
引文
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[3]胡筱敏,董怡华,李亮,等.光合细菌PSB-1D对2-氯苯酚的降解特性研究[J].环境科学,2001,3(7):158-166.Hu Xiaomin,Dong Yihua,Li Liang,et al.Biodegradation characteristics of o-chlorophenol with photosynthetic bacteria PSB-1D[J].Environmental Science,2001,3(7):158-166.
[4]王旭明,王建龙.利用固相反硝化同时去除水中硝酸盐和4-氯酚[J].环境科学,2009,30(5):1421-1424.Wang Xuming,Wang Jianlong.Simultaneous removal of nitrate and 4-chlorophenol from contaminated water using solid-phase denitrification process[J].Environmental Science,2009,30(5):1421-1424.
[5]岳钦艳,杨晶,高宝玉,等.活性炭纤维对水中酚类化合物的吸附特性[J].环境科学,2008,29(10):2862-2867.Yue Qinyan,Yang Jing,Gao Baoyu,et al.Adsorption characteristics of phenol compounds in water by activated carbon fiber[J].Environmental Science,2008,29(10):2862-2867.
[6]曹德峰,刘宝春,葛海峰.碳纳米管对水中4-氯酚和2,4-二氯酚的吸附性能研究[J].环境科学与技术,2001,33(3):80-83.Cao Defeng,Liu Baochun,Ge Haifeng,et al.Adsorption effects of p-chlorophenol and in water by carbon nanotubes[J].Environmental Science&Technology,2001,33(3):80-83.
[7]庞素艳,江进,马军,等.Mn O2催KMn O4氧化降解酚类化合物[J].环境科学,2010,31(10):2331-2335.Pang Suyan,Jiang Jin,Ma Jun,et al.Oxidation of phenolic with permanganate catalyzed by manganese dioxide[J].Environmental Science,2010,31(10):2331-2335.
[8]毕强,薛娟琴,于丽花,等.基于Ti/Sn O2阳极的电化学法降解对硝基苯酚[J].化工进展,2013,32(12):3015-3036.Bi Qiang,Xue Juanqin,Yu Lihua,et al.Study on electrochemical degradation of p-nitrophenol based on Ti/Sn O2electrode[J].Chemical Industry and Engineering Progress,2013,32(12):3015-3036.
[9]马淳安,王芬,卢金金,等.2,4-二氯苯酚的电化学氧化降解反应研究[J].高等学校化学学报,2013,34(12):2850-2854.Ma Chun’an,Wang Fen,Lu Jinjin,et al.Studies on electrochemical oxidation reaction of 2,4-dichlorophenol on Pt electrode[J].Chemical Journal of Chinese Universities,2013,34(12):2850-2854.
[10]刘福兴,李义久.电化学催化氧化降解有机物的机理及研究进展[J].四川环境,2005,24(1):52-56.Liu Fuxing,Li Yijiu.Mechanism and development of electrochemical catalytic oxidation in degradation of organic pollutants[J].Sichuan Environment,2005,24(1):52-56.
[11]沈宏,夏伊静,戴启洲,等.稀土的掺杂会对电极性能产生多方面的影响[J].染料与染色,2013,50(2):49-62.Shen Hong,Xia Yijing,Dai Qizhou,et al.The mutiple effect of doping of rare earth on the performance of electrode[J].Dyestuffs and Coloration,2013,50(2):49-62.