改性镁铝水滑石对Zn^(2+)的吸附研究  

Adsorption of Zn^(2+)by modified MgAl hydrotalcite

作　　者：龙文玲 王鑫[1] 曹春艳[1] 王敏[1] 赵爽[1] LONG Wen-ling;WANG Xin;CAO Chun-yan;WANG Min;ZHAO Shuang(College of Chemistry and Chemical Engineering,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学化学与材料工程学院,辽宁锦州121013

出　　处：《化学研究与应用》2025年第1期176-182,共7页Chemical Research and Application

基　　金：渤海大学博士启动基金(0159bs009)资助。

摘　　要：采用高温煅烧的方法对镁铝水滑石进行改性,并以其为吸附剂,通过静态吸附实验考察其对Zn^(2+)的吸附性能。实验结果表明,高温煅烧改性明显提高了镁铝水滑石对Zn^(2+)的吸附性能,其提高程度取决于煅烧温度,在600℃:煅烧的镁铝水滑石表现出最高的吸附容量。随着吸附时间、Zn^(2+)初始浓度以及溶液pH的增加,所有镁铝水滑石对Zn^(2+)的吸附容量均增加。当煅烧温度不高于200℃时,镁铝水滑石对Zn^(2+)的吸附满足Langmuir等温吸附模型,当煅烧温度高于400℃时,镁铝水滑石对Zn^(2+)的吸附满足Freundlich等温吸附模型。所有镁铝水滑石对Zn^(2+)的吸附均满足伪二级动力学方程。Zn^(2+)主要以Zn(OH)2沉淀形式沉积在镁铝水滑石的表面。The MgAl hydrotalcite was modified by high-temperature calcination to obtain the modified MgAl hydrotalcite adsorbent.The adsorption performance of MgAl hydrotalcite for Zn^(2+)was investigated by static adsorption experiments.The experimental results showed that the adsorption capacity of MgAl hydrotalcite for Zn^(2+)was obviously improved through high-temperature calcination modification,and the improvement degree was dependent on the calcination temperature.The MgAl hydrotalcite calcined at 600℃showed the highest adsorption capacity.The adsorption capacity of all MgAl hydrotalcites increased with the increase of adsorption time,initial Zn^(2+)concentration and pH of solution.The adsorption of MgAl hydrotalcites calcined at lower than 200℃and higher than 400℃for zinc would meet the Langmuir and Freundlich isothermal model,respectively.The adsorption of all MgAl hydrotalcites for Zn^(2+)satisfied the pseudo-second-order kinetic equation.Zn^(2+)was mainly deposited on the surface of MgAl hydrotalcite as Zn(OH)_2 precipitation.

关 键 词：镁铝水滑石 煅烧 Zn^(2+) 吸附 

分 类 号：O614.2[理学—无机化学]