摘要
通过硝酸铵改性天然斜发沸石,探讨沸石投加量、温度、时间对铜的吸附效果、吸附特性及作用机理.结果表明:沸石改性后对铜的吸附效率显著提高,用量为100g/L时效益最好,最大吸附量为4 170.9mg/kg;Lang-muir和Freundlich都能较好地描述改性沸石对Cu2+的等温吸附过程,改性沸石对Cu2+的吸附反应是自发的化学吸附过程,吸附行为符合准二级动力学模型;Elovich方程模型拟合结果表明改性沸石对Cu2+的吸附过程近似非均相扩散过程;颗粒内扩散模型拟合结果表明颗粒内扩散在吸附过程中不是唯一的控速阶段.
Natural clinoptilolite was modified by ammonium nitrate and the effects of zeolite dosage, reac tion temperature and reaction time on Cu2＋ adsorption by zeolite were studied, and the underlying mecha nism was discussed. Zeolite, after modification, significantly increased its adsorption efficiency of copper ions, the best dosage being 100 g/L and the maximum adsorption capacity being 4 170.9 mg/kg. The equi librium data of modified zeolite well conformed to the Freundlich and Langmuir isotherm equations, and the reaction of modified zeolite adsorption of copper ions was a spontaneous chemical adsorption process and followed the pseudo-second-order kinetic expressions. The Elovieh model fitted results showed that adsorption process was nearly a heterogeneous diffusion process. The particle diffusion model fitted results showed that particle diffusion in the adsorption process was not the only speed-control stage.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第11期52-56,共5页
Journal of Southwest University(Natural Science Edition)
基金
国家大学生创新性实验计划资助项目(101063503)
关键词
改性沸石
铜离子
吸附
热力学
动力学
modified zeolite
copper ion
adsorption
thermodynamics
kinetics
