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Ce-PbO_2/C电极的制备及其去除水中酸性红B 被引量:5

Preparation of Ce-PbO_2/C and its application in removing Acid Red B from water
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摘要 采用电沉积法制备铈修饰的PbO2/C电极,通过SEM、XRD、XPS及循环伏安对PbO2/C、Ce-PbO2/C电极进行表征,结果表明,Ce-PbO2/C电极比PbO2/C颗粒细小,表面均匀致密,电化学氧化能力较强,修饰电极中Ce以CeO2的形态存在。以Ce-PbO2/C为工作电极,电解浓度为1 000 mg/L的高盐酸性红B模拟活性染料废水,考察了电压、pH、电解质浓度、极间距对脱色率、氨氮去除率及COD去除率的影响。确定适宜工艺条件为:初始酸性红B溶液浓度为1 000 mg/L,pH值为6,电压10 V,电解时间1 h,电极间距1.5 cm,该条件下脱色率、氨氮去除率和COD去除率分别为99.98%、97.23%和90.17%。通过UV-Vis及GC-MS初步分析了降解过程可能存在的中间产物及降解途径。 Graphite-lead dioxide electrodes doped with rare earth Ce were prepared by electrodeposition.Then the PbO2/ C electrode and Ce-PbO2/ C electrodes were characterized by SEM,XPS,XRD and cyclic voltammetry. The results showed that the Ce-PbO2/ C electrode surface is more dense and uniform and the crystal size is smaller,and its ability of catalytic oxidation is stronger than that of PbO2/ C. Ce in the modified electrode exists in CeO2 morphology. The modified electrode was used as working electrode to treat high salinity simulative dyeing wastewater containing Acid Red B( 1 000 mg/L),and the effects of different factors( voltage,pH,electrolyte concentration and electrode distance) on the removal efficiency of COD,colour and ammonia nitrogen were investigated. The optimum conditions are achieved as follows: the initial Acid Red B concentration of 1 000mg/L,initial pH value of 6,the voltage of 10 V,electrolytic time of 1 h and electrode spacing of 1. 5 cm. Under such conditions,the removal efficiency of colour,ammonia nitrogen and COD can reach up to 99. 98%,97. 23% and 90. 17%,respectively. The possible intermediates and degradation pathways of Acid Red B were monitored by UV-Vis spectra and GC-MS.
出处 《环境工程学报》 CAS CSCD 北大核心 2014年第3期941-947,共7页 Chinese Journal of Environmental Engineering
基金 国家科技支撑计划(2011BAE07B09-2)
关键词 Ce-PbO2 C 电极表征 电化学氧化 酸性红B Ce-PbO2/ C electrode characterization electrochemical oxidation Acid Red B
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