Cu^(2+)改性活性炭的制备及其去除废水中CN^-的研究  

Preparation of Cu^(2+)-Modified Activated Carbon and Its Use to Removal of CN^- from Wastewater

作　　者：张明祖[1] 刘建[1] 覃路燕[1] 

机构地区：[1]长安大学环境科学与工程学院化学工程系,陕西西安710054

出　　处：《化工环保》2008年第4期308-311,共4页Environmental Protection of Chemical Industry

摘　　要：以活性炭为载体负载溶液中的 Cu^(2+),Cu^(2+)改性活性炭对溶液中 CN^-的去除效果较好。Cu^(2+)改性活性炭的最佳制备条件:活性炭加入量为1 g,质量浓度为5 g/L 的 CuSO_4溶液加入量为50 mL,溶液 pH 为4,负载时间为5.0 h。在此最佳条件下活性炭的最大 Cu^(2+)负载量为25.90 mg(以每克活性炭计)。Cu^(2+)改性后活性炭的 CN^-去除率明显提高,由22.10%提高至94.07%。Cu^(2+)改性活性炭吸附CN^-的最佳实验条件:溶液 pH 为12～13,吸附时间为9 h。Cu^(2+)改性活性炭对 CN^-的饱和吸附量为22 mg/g。Mg^(2+),K^+,Ca^(2+),Cl^-,SO_4^(2-),CO_3^(2-),AsO_3^-对 Cu^(2+)改性活性炭的 CN^-去除率基本没有影响。Cu^(2+)改性活性炭的动态吸附实验表明,开始一段时间流出液中 CN^-含量几乎为零,远低于国家排放标准(0.5 mg/L)。The activated carbon modified by Cu^2＋ has a better effect on removing CN- from solution. Its optimum preparation conditions are as follows： activated carbon dosage 1 g, 5 g/L CuSO4 solution dosage 50 mL, solution pH 4 and loading time 5.0 h. In these conditions, the maximum loading of Cu^2＋ is 25.90 mg/g. The modified activated carbon＇s capability to removing CN is improved from 22.10% to 94.07%. The optimum experimental conditions for adsorbing CN- are as follows： NaCN solution pH 12 - 13 and adsorption time 9 h. The modified activated carbon＇s saturation adsorption capacity is 22 mg/g. Mg^2＋ , K^＋, Ca^2＋ , Cl-, SO42^-, CO3^2- , AsO3^- have no effects on the removal of CN^-. Dynamic adsorption experiment results show that there is almost no CN^- in the outflow solution in the beginning period, which is much lower than the national discharge standard of 0.5 mg/L.

关 键 词：氰化物 活性炭 吸附 负载铜离子 含氰废水 

分 类 号：X703[环境科学与工程—环境工程]