【摘要】 电絮凝是去除废水中重金属离子的有效技术。研究考察了极板类型、电流密度、溶液pH值和阳离子(Ca2+、Mg2+)、阴离子(SO42-、Cl-、NO3-、H2PO2-)对电絮凝除Cu2+的影响,并解析这些影响因素对电絮凝效率的作用机制。结果表明,采用铁板电极在电流密度13 mA/cm2、初始pH=5.0,反应60 min后Cu2+(250 mg/L)去除率可达99%以上。Ca2+、Mg2+对Cu2+的电絮凝去除影响不明显,SO42-、H2PO2-、Cl-对除Cu2+有促进作用,而NO3-的存在会显著降低除Cu2+效果。更多还原

【Abstract】 Heavy metal ions can be effectively removed by electrocoagulation technique. Effect of electrode type,current density,aqueous pH and cations including Ca2+ and Mg2+ as well as anions such as SO4 2-,Cl-,NO3-and H2 PO2-on the removal efficiency of Cu2 +was studied. The influence mechanism of these factors on electrocoagulation efficiency was analyzed. Results indicated that the removal rate of Cu2+(250 mg/L) was more than 99% during 60 min electrolysis at 13 mA/cm2of current density and initial pH 5.0 with iron electrode. The removal performance of Cu2+was not significantly influenced by Ca2 +and Mg2 +in solution. The presence of SO4 2-,Cl- and H2 PO2-in solution could promote Cu2 +removal, however,NO3-addition could obviously decrease the removal efficiency of Cu2+during the electrocoagulation process.更多还原