改性膨润土对水中蒽的吸附和解吸

分别用长碳链季铵盐阳离子型表面活性剂溴化十六烷基三甲铵（HDTMAB）、短碳链季铵盐阳离子型表面活性剂四甲铵化溴（TMAB）及非离子型表面活性剂聚乙二醇（PEG）对天然膨润土进行改性。比较了不同类型改性膨润土对水中蒽的吸附性能，探讨了吸附机理。实验结果表明，天然膨润土及改性膨润土对水中蒽的吸附能力依次为HDTMAB改性膨润土〉PEG改性膨润土〉TMAB改性膨润土〉天然膨润土；吸附等温线均是直线，说明该吸附行为是分配作用的结果。不同蒽初始质量浓度下，各种改性膨润土对蒽的吸附量由大至小的顺序为HDTMAB改性膨润土〉PEG改性膨润土〉TMAB改性膨润土，而天然膨润土对蒽的吸附量随蒽初始质量浓度的变化很小。改性膨润土加入量为30～80g/L时，各种改性膨润土对水中蒽的去除率均可达到90％以上，且解吸率均在5％以下。

Adsorption and Desorption of Anthracene in Water on Modified Bentonite

Crude bentonite was modified using hexadecyl trimethylammonium bromide(HDTMAB,long chain hyamine cationic surfactant),tetramethylammonium bromide(TMAB,short chain hyamine cationic surfactant)and polyethylene glycol(PEG,nonionic surfactant),respectively.The adsorpotion of anthracene in water by different type of modified bentonite was compared and their adsorption mechanism was studied.The results show that the order of their capacity adsorbing anthracene in water is:HDTMAB modified bentonite>PEG modified bentonite>TMAB modified bentonite>crude bentonite.Their linear adsorpotion isotherms to anthracene prove that the adsorption is a result of partition.With different initial concentration of anthracene,the order of the adsorbing capacity of each modified bentonite is:HDTMAB modified bentonite>PEG modified bentonite>TMAB modified bentonite,the change of the adsorbing capacity of crude bentonite is unconspicuous.The anthracene removal rate by each modified bentonite is over 90%,and their desorption efficiency are all below 5%.