表面活性剂改性的4A分子筛对氨氮的吸附行为  

Adsorption behavior of surfactant-modified molecular sieve 4A for ammonium

作　　者：王芳[1] 

机构地区：[1]滨州学院化学工程系滨州市材料化学重点实验室,山东滨州256600

出　　处：《应用化工》2015年第6期1045-1049,共5页Applied Chemical Industry

基　　金：山东省自然科学基金项目(ZR2014BL014);山东省高等学校科技计划项目(J14LC54);滨州市科学技术发展计划项目(2014ZC0212);滨州学院基金项目(2010Y06;BZXYFB20140806;BZXYFB20100403;BZXYQNLG200912)

摘　　要：用表面活性剂十六烷基三甲基溴化铵(CTAB)和十二烷基苯磺酸钠(LAS)改性4A分子筛,利用X射线衍射和红外吸收光谱表征了改性前后4A分子筛的结构,并研究了其对氨氮的吸附行为。结果表明,两种表面活性剂的添加均能在一定程度上提高4A分子筛吸附氨氮性能,CTAB的改性效果优于LAS,且当两种表面活性剂m(CTAB)∶m(LAS)=10时复配效果最佳。此外,分别采用准一级动力学方程、准二级动力学方程和颗粒内扩散方程对改性4A分子筛吸附氨氮行为进行拟合。结果显示改性前后4A分子筛对氨氮的吸附过程可用Langmuir吸附等温方程较好地拟合,在温度为25℃时,单分子层饱和吸附量分别为5.61 mg/g和6.15 mg/g,其吸附动力学较符合准二级反应动力学方程。4A sieve was modified with surfactant hexadecyltrimethylammonium bromide（ CTAB） and sodium dodecyl sulfate（ LAS） by using impregnation method,and the performance of ammonia adsorption was measured. The structure of the zeolites before and after modification was analyzed by means of IR and XRD. Results show that the performance of modified 4A sieve can be enhanced in a certain extent by the addition of surfactant,effect is better than that of LAS modified by CTAB,and when the two kinds of surfactant m（ CTAB） ∶ m（ LAS） = 10 compound effect is the best. In addition,the kinetic data were respectively fitted by pseudo-first-order equation,pseudo-second-order equation and the intra-particle diffusion model. The results show that the adsorption of ammonia-nitrogen on origin and modified 4A sieve could be well fitted by Langmuir isotherms equation,and the theoretical maximum adsorption capacity is5. 61 mg/g and 6. 15 mg/g. The dynamic adsorption data were well described by pseudo second order reaction rate model.

关 键 词：表面活性剂 4A分子筛 氨氮 

分 类 号：TQ111.19[化学工程—无机化工] TQ013.2