电催化内电解去除废水中Zn^(2+)的研究

Research for Removal of Zn^(2+) in Wastewater by Electrocatalytic Internal Micro-electrolysis

电催化内电解(ECIME)体系有效提升了内电解法对废水中重金属的去除和克服填料的钝化失活。结合单因素实验、冗余分析(RDA)和响应曲面(RSM)等对影响ECIME对废水中锌离子去除工艺环境因素进行了探讨和优化。结果表明,相比内电解,ECIME体系有效减少了Zn^(2+)去除对溶液pH和铁碳(Fe^0/C)质量比等的依赖性。电压、反应时间和曝气量对Zn^(2+)去除效率影响最大;RSM分析可获得较好的回归方程和最优解,在电压为16.4V、反应时间90min、曝气2.81L/min时,Zn^(2+)最优去除率达到95.42%。同时还对体系铁碳填料表面产生的絮凝体进行了X射线光电子光谱法分析,经Zn2p的局部扫描拟合结果表明Zn主要以氢氧化物或氧化物形式存在。

Compared with internal micro-electrolysis,the removal efficiency of heavy metal by iron/carbon electrocatalytic internal micro-electrolysis(ECIME)was improved effectively and the passivation and inactivation of iron/carbon packing were overcome.Combining single factor experiment,redundancy analysis(RDA)and response surface method(RSM),the factors affecting the process of the zinc ions removal by ECIME in wastewater were studied and optimized.The results showed that the dependence on solution pH and iron carbon(Fe^0/C)ratio for Zn^(2+)removal was reduced effectively by ECIME system.The voltage,reaction time and oxygen had greater influence on Zn^(2+) removal efficiency.RSM analysis achieved a good regression equation and an optimal solution.When the voltage was 16.4V,the reaction time was 90 min and the aeration was 2.81L/min,the Zn^(2+)optimal removal rate reached 95.42%.At the same time,the flocculation of iron/carbon filler surface was analyzed by XPS.The local scan of Zn2 p showed that the main form of zinc was hydroxide or oxide.