环糊精改性沸石制备方法及对对-硝基苯酚吸附性能的影响  

Preparation of cyclodextrin-modified zeolite and effects on adsorption characters of p-nitrophenol

作　　者：李效红[1] 朱琨[1] 郝学奎[2] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州工业高等专科学校,兰州730050

出　　处：《环境工程学报》2008年第7期922-926,共5页Chinese Journal of Environmental Engineering

基　　金：甘肃省自然科学基金资助项目(3ZS061-A25-025)

摘　　要：在碱性条件下,β-环糊精与2,3-环氧丙基三甲基氯化铵合成了阳离子化的β-环糊精(CCD),并用于改性沸石获得环糊精改性沸石(CDMZ)。研究了CCD合成条件对CDMZ吸附对-硝基苯酚性能的影响。结果表明,在2,3-环氧丙基三甲基氯化铵与β-环糊精的配比为7∶1,溶液pH=13的合成条件下,合成的CCD改性沸石所得CDMZ对对-硝基苯酚的吸附能力最佳。同时研究了沸石改性前的活化处理,CCD改性沸石的初始浓度和改性时间对CDMZ吸附对-硝基苯酚性能的影响。实验表明,改性前用NaC l溶液活化沸石有助于CDMZ吸附性能的改善;当CCD改性沸石的初始浓度和改性时间分别为15 g/L(以β-环糊精计)和8 h时,所得CDMZ对对-硝基苯酚(120 mg/L)的吸附能力可达263.7μg/g。Zeolite was modified by cationic β-cyclodextrin （CCD） which was synthesized by β-cyclodextrin and 2, 3-epoxypropyltrimethyl-ammonium chloride in the basic medium, and then the cyclodextrin-modified-zeolite （CDMZ） was prepared. The effects of the synthetic conditions of CCD on adsorption capacity of CDMZ were investigated. The results indicated that the adsorption capacity of p-nitrophenol onto CDMZ was optimal under the synthesizing conditions of the mole ratio between 2, 3-epoxypropyltrimethyl-ammonium chloride and β-cyclodextrin as 7：1 at pH = 13. Furthermore, the effects of activation before modification, the initial concentration of CCD and the modification time on adsorption capacity of CDMZ to remove p-nitrophenol were studied. The experiments certified that the activation using sodium chloride solution was beneficial to enhance the adsorption capaci- ty of CDMZ. When initial CCD concentration and modification time were 15 g/L（ calculated by β-cyclolextrin） and 8 h respectirely, the adsorption capacity of p-nitrophenol（ 120 mg/L）onto CDMZ reached 263.7μg/g.

关 键 词：Β-环糊精 沸石 改性 对-硝基苯酚 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]