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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p H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.
In order to improve the treatment effect of copper-containing wastewater and simplify the treatment process, polyacrylamide (PAM), formaldehyde, sodium hydroxide and thioglycolic acid (TGA) were used as raw materials to prepare the intermediate methylol polypropylene (MPAM), and then the amidation reaction was carried out to graft the mercapto onto the MPAM molecular chain to prepare a new heavy metal flocculant mercaptoacetylated poly (methylolacrylamide) (MAMPAM). The removal rate of Cu (Ⅱ) For the purpose of investigation, the preparation conditions of MAMPAM were optimized by Plackett-Burman experiment, steepest ascent experiment and response surface methodology in CCD experiments.The results showed that the optimal preparation conditions of MAMPAM were MPAM concentration 0.31%, mass ratio of MPAM to TGA Was 1: 3.2, the reaction medium pH was 4.76, the reaction temperature was 25 ℃ and the reaction time was 2 h. The removal rate of Cu (Ⅱ) by MAMPAM prepared under these conditions was 95.30% 94.47%, the relative deviation is only 0.83%, the model is reasonable and reliable. Infrared analysis shows that the MPAM molecular chain is successfully connected to the thiol group.MAMPAM has good removal efficiency for Cu (Ⅱ) Ⅱ) removal rate can reach more than 90% .MAMPAM is expected to become one Effective copper wastewaters, having a certain application.