PDMDAAC-膨润土对对硝基苯酚吸附特性的研究  

SORPTION PROPERTIES OF p-NITROPHENOL TO PDMDAAC-BENTONITE FROM WATER

作　　者：张红梅[1] 彭先佳[1] 栾兆坤[1] 徐东耀[2] 

机构地区：[1]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [2]中国矿业大学化学和环境工程学院,北京100083

出　　处：《环境化学》2005年第2期205-208,共4页Environmental Chemistry

基　　金：国家"十五"科技攻关项目(基金号2002BA206B04-01B);国家重点实验室开放基金资助.

摘　　要：以聚二甲基二烯丙基氯化铵(PDMDAAC)为改性剂,对天然钙基膨润土进行有机改性,比较PDMDAAC膨润土与膨润土对对硝基苯酚废水的处理性能,研究了改性剂用量以及对硝基苯酚浓度、pH值、反应时间等因素对膨润土吸附去除率的影响.结果表明PDMDAAC改性膨润土对对硝基苯酚的吸附效果比膨润土有较大提高,吸附去除率达84%;吸附后的PDMDAAC膨润土可用酸进行再生,再生后对对硝基苯酚的吸附去除率没有明显下降;PDMDAAC膨润土对对硝基苯酚的吸附行为可用Freundlich型吸附等温线较好地进行拟合.PDMDAAC-bentonite was prepared by modifing bentonite with poly(dimethyldiallylammonium chloride)(PDMDAAC). The sorption properties of PDMDAAC-bentonite for p-nitrophenol were compared with ~bentonite's . The effects of some factors such as the dosage of the modification reagent ,the concentration of p-nitrophenol, pH and time on the sorption were examined. The results showed that the sorption of p-nitrophenol by PDMDAAC-bentonite was higher than that of the original bentonite. In the process of preparation , the best mass proportion of PDMDAAC to bentonite was 0.233.The removal rate reached 84% after 20min shaking in the condition of best mass proportion, natural pH and 20℃. PDMDAAC-bentonite could be regenerated with acid and the removal rate to p-nitrophenol of the regenerated sorbent did not drop obviously. The sorption isotherm fits Freundlich equation.

关 键 词：对硝基苯酚 PDMDAAC 去除率 吸附特性 废水 膨润土 吸附效果 改性剂 反应时间 再生 

分 类 号：X703[环境科学与工程—环境工程] X788