摘要
为提高重金属废水的处理效果,以聚丙烯酰胺(PAM)、甲醛、亚硫酸氢钠、巯基乙酸(TGA)为原料,先经磺甲基化反应制备中间产物磺甲基化聚丙烯酰胺(SPAM),再通过酰胺化反应将重金属离子的强配位基巯基(-SH)接入SPAM,得到重金属絮凝剂巯基乙酰化磺甲基聚丙烯酰胺(MASPAM).以含铜废水为处理对象,采用Plackett-Burman试验、最陡爬坡试验及响应面试验优化MASPAM制备条件.结果表明:MASPAM最优制备条件为SPAM质量分数为0.5%,SPAM与TGA物质的量比为1∶2.84,反应介质pH值为5,反应温度为45℃,反应时间为2 h.此条件下制备的MASPAM在投药量为150 mg/L时对Cu(Ⅱ)的去除率为92.44%,与模型预测值的相对误差仅为0.05%,表明采用响应面法优化MASPAM的制备条件合理可行.
In order to improve the treatment efficiency of waste water containing heavy metal ions,a novel heavy metal chelated orignic polymer flocculant,called sulfhydryl acetylated sulfamethylated polyacrylamide,was prepared by using polyacrylamide(PAM),formaldehyde,sodium hydrogen sulfite and mercaptoacetic acid(TGA).Sulfomethylated polyacrylamide(SPAM)was first synthesized through sulfomethylation reaction,and then,the strong coordination group of heavy metal ions-sulfhydryl is added to SPAM through amidation reaction.Plackett-Burman experiment,steepest slope experiment and response surface experiment by treating copper-containing waste water were used to optimize the preparation conditions of MASPAM.The results show that the optimum synthesis conditions of MASPAM were as follows:the molar ratio between SPAM and TGA was 1∶2.84,the pH value of reaction medium is 5,the concentration of SPAM was 0.50%,the reaction temperature was 45℃and the reaction duration was 2 hours respectively.The removal rate of Cu(II)was 92.44%under the optimum conditions when the dosage is 150 mg/L while the model prediction relative error is only 0.05%.The results show that the response surface method is reasonable and feasible to optimize the preparation conditions of MASPAM.
作者
姜蓉
王刚
张翠玲
常青
JIANG Rong;WANG Gang;ZHANG Cui-ling;CHANG Qing(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《兰州交通大学学报》
CAS
2019年第6期83-89,共7页
Journal of Lanzhou Jiaotong University
基金
国家自然科学基金(51368030)
兰州交通大学“百名青年优秀人才培养计划”基金(2018)
