焙烧态镁铝水滑石吸附水中溴离子的研究  

Adsorption of Bromide Ion from Aqueous Solution by Calcined Mg-Al Hydrotalcites

作　　者：张蕾[1] 严刚[2] 

机构地区：[1]青海大学土木工程学院,西宁810016 [2]青海大学化工学院,西宁810016

出　　处：《科技通报》2016年第3期214-217,共4页Bulletin of Science and Technology

摘　　要：对焙烧态镁铝水滑石吸附水溶液中溴离子进行了研究,考察了吸附时间、吸附液p H值和吸附温度对吸附量的影响,计算得到了有关动力学和热力学参数。结果表明:焙烧态镁铝水滑石对溴离子的吸附基本符合二级反应速率方程和Langmuir吸附等温式,500℃焙烧态水滑石(n Mg/n Al=4)的饱和吸附量达119.05mg·g-1。Mg-Al hydrotalcites with 4 Mg/Al mole ratios is prepared by co-precipitation method, calcined at 500℃to get the calcined samples. The adsorption capacity of bromide ion from simulated waste water on Mg-Al calcined samples is measured. We investigate the effect of adsorptive time ,pH value of initial adsorbate solution and adsorptive temperatures on the adsorption capacity of Mg-Al calcined samples. The kinetic and equilibrium data of adsorption studies are processed , and the kinetic and thermodynamic parameters are calculated. The results show that the adsorption of Mg-Al calcined samples for bromide ion is an exothermic physic sorption , which fits well with second-order kinetic equation and Langmuir isotherm model. The Mg-Al calcined hydrotalcites adsorption capacity is 119.05mg·g-1 at 40℃.

关 键 词：焙烧态镁铝水滑石 吸附 溴离子 

分 类 号：X52[环境科学与工程—环境工程]