介孔Cr(OH)_3的制备及其对钒(Ⅴ)离子的吸附性能  

Synthesis of mesoporous Cr(OH)_3 and its adsorption of vanadium(Ⅴ) ion from V containing solution

作　　者：李华琳[1,2,3] 雒敏婷[2,3] 张红玲[2,3] 石义朗 张炳烛[1] 蔡再华 徐红彬[2,3] 张懿[2,3] 

机构地区：[1]河北科技大学化学与制药工程学院,河北石家庄050018 [2]中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室,北京100190 [3]中国科学院绿色过程与工程重点实验室,北京100190 [4]湖北振华化学股份有限公司,湖北黄石435001

出　　处：《化工学报》2016年第12期5283-5290,共8页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2013CB632600);国家自然科学基金项目(21406233;21376251)~~

摘　　要：以CrCl_3·6H_2O作为铬源,通过添加强碱制备出大比表面积(312.70 m^2·g^(-1))、高孔隙率(0.48 cm^3·g^(-1))的介孔Cr(OH)_3,并研究了其对溶液中钒(V)离子的吸附性能,考察了溶液pH、吸附剂用量、吸附温度、吸附时间等条件对吸附效果的影响。结果表明,当溶液pH在2.0~9.0、钒离子浓度为100~500 mg·L^(-1)时,采用该吸附剂均可实现溶液中钒离子的高效去除。在最优实验条件下,钒去除率接近100%,钒离子浓度可由500 mg·L^(-1)降至0.81 mg·L^(-1)。吸附热力学的研究结果表明,Cr(OH)_3对钒离子的吸附过程遵循Langmuir等温吸附;吸附过程符合拟二级反应动力学方程,反应级数为拟二级。Previous study have examined many materials to remove the vanadium ions from aqueous solution, but it is difficult to meet the national discharge standard. In this paper, a mesoporous chromium hydroxide（Cr（OH）_3）, which has a high specific surface area（312.70 m2·g（-1）） and a large pore volume（0.48 cm3·g（-1））, was synthesized by adding Na OH solution into CrCl_3·6H_2O solution drop by drop. The mesoporous Cr（OH）_3 powders were used as adsorbents to remove vanadium ions from aqueous solution, which showed high efficiency in vanadium removing at p H from 2.0～9.0 and concentration of V（5＋） ranging from 100 to 500 mg·L（-1）. Under the optimal conditions, the adsorption rate of vanadium approached to 100% and the concentration of V（5＋） decreased from 500 to 0.81 mg·L（-1）. The adsorption process belonged to the Langmuir isothermal adsorption and the coefficient was higher than 0.99. Dynamic analysis showed that the pseudo-second-order model could describe the adsorption process very well.

关 键 词：Cr(OH)3 介孔 粉体 吸附 废水 除钒 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]