• 关键词：重金属絮凝剂  响应面法  Plackett-Burman实验  最陡爬坡实验  含铜废水

• 基金项目：国家自然科学基金（No.51368030）

• 管映兵
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 王刚
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 徐敏
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 常青
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 摘要：为提高含铜废水的处理效果及简化处理流程，以聚丙烯酰胺（PAM）、甲醛、氢氧化钠、巯基乙酸（TGA）为原料，先经羟甲基化反应制备中间产物羟甲基聚丙烯酰胺（MPAM），再通过酰胺化反应将巯基接枝到MPAM分子链上，制备出新型重金属絮凝剂巯基乙酰化羟甲基聚丙烯酰胺（MAMPAM）.以水样中Cu（Ⅱ）的去除率为考察目标，采用Plackett-Burman实验、最陡爬坡实验和响应面法中CCD实验优化MAMPAM的制备条件.结果表明，MAMPAM最优制备条件为：MPAM浓度0.31%、MPAM与TGA物质的量比为1∶3.2、反应介质pH值为4.76、反应温度为25℃、反应时间为2 h，在此条件下制备的MAMPAM对Cu（Ⅱ）的去除率为95.30%，与模型的理论预测值94.47%接近，相对偏差仅为0.83%，模型合理可靠.红外分析表明MPAM分子链上成功接上了巯基.MAMPAM对不同初始浓度的含Cu（Ⅱ）水样具有很好的去除效果，Cu（Ⅱ）去除率均能达到90%以上.MAMPAM有望成为一种有效的含铜废水处理剂，具有一定的应用前景.

• Abstract：In order to improve the treatment efficiency of wastewater containing copper ions as well as to simplify the treatment process, a novel heavy metal flocculant, called mercaptoacetyl hydroxymethy-polyacrylamide (MAMPAM), was prepared by using polyacrylamide, formaldehyde, sodium hydroxide and mercaptoacetic acid (TGA). Hydroxymethyl polyacrylamide (MPAM) was first synthesized through hydroxymethylation reaction, and then sulfydryl groups were grafted onto MPAM by amidation reaction. The removal of Cu(Ⅱ) in water samples was investigated to determine the optimal conditions of MAMPAM synthesis through Plackett-Burman experiment, as well as steepest ascent experiment and central composite design (CCD) of response surface methodology (RSM). The results show that the optimum synthesis conditions of MAMPAM were as follows:the concentration of MPAM was 0.31%; the molar ratio between MPAM and TGA was 1:3.2; pH 4.76; 25℃ and 2 h, respectively. Under the optimum conditions, the removal rate of Cu(Ⅱ) could reach 95.30%, which was close to the value 94.47% predicted by the model. The results proved that the established model based on RSM was reasonable and feasible. FTIR analysis results reveal that the sulfydryl groups were successfully grafted onto the molecular chains of MPAM. MAMPAM had good removal efficiency for Cu(Ⅱ) in tested water sample, and the removal rate of Cu(Ⅱ) could reach more than 90% with the different initial concentrations. In summary, MAMPAM is a promising alternative treatment agent for the copper-containing wastewater.

• Key words：heavy metal flocculant  response surface methodology  Plackett-Burman experiment  steepest ascent experiment  copper-containing wastewater

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