改性沸石对2,4-二氯苯酚的吸附性能研究

STUDY ON ABSORPTION OF 2,4-DICHLOROPHENOL WITH MODIFIED ZEOLITES

采用溴化十六烷基三甲铵(HDTMAB)制备了改性沸石.并研究了其吸附性能的影响因素,包括HDTMAB的加入量、有机污染 物的初始质量浓度、溶液的pH值等,绘制了改性沸石吸附2,4-DCP的吸附等温线并得到了饱和吸附容量。结果表明,改性沸石对2,4 二氯苯酚(2,4-DCP)具有很好的吸附效果,实验条件下对2,4-DCP的去除率可达90％以上。

The present article aims to introducing the author's method of modifying zeolites by placing hexade-cyltrimethylammonuium bromide (HDTMAB) surfactants. With the effects of HDTMAB quantity added, the author has investigat- ed in detail the initial concentration of 2,4-dichlorophenol (2,4-DCP) and the optimal conditions which may influence the properties for modified zeolites on adsorbing the organic contaminant 2,4-DCP. As is known, though the removal efficiency of 2,4-DCP can be properly improved by increasing the initial concentration of 2,4-DCP and the concentration of HDTMAB to modify zeolites, there is still an economical concentration of 15 g·L-1. The author's experimental result shows that removal efficiency gained from the aqueous solutions can be over 90%. Since pH values play a critical role in the absorption mechanism of 2,4-DCP on modified zeolites due to the existence of 2,4-DCP in aqueous solution and the sorption increased at a pH may range from 4 to 10, the sorption isotherms curves of 2,4-DCP on modified zeolites can be obtained and prove to agreed to Freundlich-Equation.