铝离子和钛离子化学改性MCM-41介孔材料的制备及其对污水中镉离子的吸附性能(英文)  

Preparation of MCM-41 mesoporous materials modified by Al^(3+) and Ti^(4+) ions and evaluation of its adsorption behavior for cadmium(Ⅱ) in wastewater

作　　者：方璐希[1] 喻鹏[1] 刘灿明[1] FANG Lu-xi;YU Peng;LIU Can-ming(College of Science,Hunan Agriculture University,Changsha 410128,Hunan,China)

机构地区：[1]湖南农业大学理学院,湖南长沙410128

出　　处：《化学研究》2012年第1期29-34,共6页Chemical Research

摘　　要：通过在MCM-41材料中引入Al 3+和Ti 4+两种诱因金属离子合成了化学改性介孔材料Al-Ti-MCM-41和Ti-Al-MCM-41;评价了两种介孔材料对污水中镉离子的吸附行为.利用氮气吸附-脱附等温线对Al-Ti-MCM-41(1∶1)样品的吸附行为进行了详细分析,考察了吸附剂投加量、Cd2+初始质量浓度和吸附温度对其吸附行为的影响.结果表明:改性Al-Ti-MCM-41(1∶1)介孔材料的最可几孔径和比孔容分别为16nm和0.04cm3/g,由BJH法计算得到的平均孔径为17.02nm;其对污水中Cd2+的吸附率达99.8%.Cd2+的吸附率随Al-Ti-MCM-41(1∶1)介孔材料投加量的增加先增加而后降低最终达到平衡,吸附容量随Cd2+初始浓度的增大而增加;吸附温度对吸附行为基本无影响.Chemically modified mesoporous materials Al-Ti-MCM-41 and Ti Al-MCM-41 were prepared by incorporating al3＋ and Ti4＋ ions as inducement ions into MCM-41. The adsorption behavior of the two kinds of mesoporous materials for Cd2＋ in wastewater was evaluated. Particularly, the adsorption performance of sample Al-Ti-MCM-41 （1 ： 1） was analyzed in detail based on nitrogen adsorption and desorption isotherms, with which the effects of adsorbent dosage on the adsorption rate and initial concentration of Cd2＋ on the adsorption capacity were highlighted. However, the adsorption behavior was not affected by temperature. Results show that the most probable pore diameter and specific pore volume of Al-Ti-MCM-41（1 = 1） are 16 nm and 0.04 cm3/g, respectively. Its average diameter determined by the BJH method is 17.02 nm, and it is able to adsorb Cde＋ in wastewater at a rate of up to 99.8%. Moreover, the adsorption capacity of Cd2＋ decreased with increasing adsorbent dosage but increased with increasing initial concentration of Cd2＋.

关 键 词：Al3+ Ti4+ 化学改性 MCM-41 介孔材料 Cd2+ 吸附行为 

分 类 号：X522[环境科学与工程—环境工程]