HDTMA改性沸石的制备及吸附废水中对硝基苯酚的性能和动力学  

Preparation of HDTMA-modified Zeolite and Its Performance in Nitro-phenol Adsorption from Wastewaters

作　　者：郭俊元[1] 王彬[1] 

机构地区：[1]成都信息工程大学资源环境学院,成都610225

出　　处：《环境科学》2016年第5期1852-1857,共6页Environmental Science

基　　金：国家自然科学基金项目(51508043);成都信息工程大学中青年学术带头人科研人才基金项目(J201515)

摘　　要：采用十六烷基三甲基溴化铵(HDTMA)对天然沸石进行改性,研究了沸石的改性条件、改性沸石投加量、废水p H值、反应时间等对HDTMA改性沸石去除废水中对硝基苯酚性能的影响,并分析了吸附动力学和吸附等温线.结果表明,改性沸石对废水中对硝基苯酚的吸附效果明显高于天然沸石,当制备改性沸石的HDTMA溶液的质量分数为1.2%,且其p H值为10时,改性沸石对废水中对硝基苯酚的吸附量达到2.53 mg·g^(-1),远高于天然沸石的0.54 mg·g^(-1).吸附实验中,改性沸石投加量8 g·L^(-1),反应时间90 min,p H=6的条件下,HDTMA改性沸石对废水中对硝基苯酚的去除率高达93.9%.吸附动力学和等温线研究表明,一级动力学方程能够更好地拟合沸石吸附对硝基苯酚的过程(R2>0.90),不同温度条件下Langmuir等温线拟合方程的相关系数均在0.90以上,数据和方程拟合性较好.In this study,natural zeolite was modified by HDTMA. Effects of the modified conditions,HDTMA-modified zeolite doses,solution p H values,and reaction time on nitro-phenol removal were investigated,and the adsorption kinetics and isotherms were discussed. Compared with natural zeolite,HDTMA-modified zeolite showed better performance in nitro-phenol removal. An adsorption capacity of 2. 53 mg·g^-1was achieved when the concentration of HDTMA solution（ p H = 10） was 1. 2% in preparation of modified zeolite. This adsorption capacity was higher than that obtained by natural zeolite（ 0. 54 mg·g^-1）. In adsorption tests,when HDTMAmodified zeolite dose was adjusted to 8 g·L^-1,the removal efficiency of nitro-phenol reached 93. 9% after 90 min reaction,with wastewater p H of 6. Furthermore,the nitro-phenol adsorption process could be well fitted to the pseudo-first-order kinetics model（ R2 0. 90）,whereas the adsorption isotherm results indicated that Langmuir model provided the best fitting for the equilibrium data at different temperatures,with R2 of higher than 0. 90.

关 键 词：对硝基苯酚 十六烷基三甲基溴化铵 改性沸石 吸附动力学 吸附等温线 

分 类 号：X703.1[环境科学与工程—环境工程]