CMC-4A/凹土颗粒对重金属离子的竞争吸附  

Competitive Adsorption of Aqueous Metal Ions by a Granular CMC-4A Molecular Sieve/Attapulgite Composite

作　　者：敖翔[1] 刘红[1] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《环境科学与技术》2017年第12期210-215,共6页Environmental Science & Technology

基　　金：国家自然科学基金项目(50904047);湖北省环保厅项目(2015HB05)

摘　　要：CMC-4A分子筛/凹凸棒土颗粒材料作为吸附剂应用于重金属废水处理,对其微观形貌和晶相结构进行了表征,并研究了CMC水溶液比例和煅烧温度等制备条件对颗粒材料吸附重金属离子的影响,同时探讨了CMC-4A/凹土颗粒对Pb(Ⅱ)、Cd(Ⅱ)、Zn(Ⅱ)的单一离子吸附和竞争吸附特性。结果表明,CMC-4A/凹土颗粒的最佳制备条件是:添加0.7%CMC水溶液,于600℃煅烧;在单组分吸附、二元竞争吸附和三元竞争吸附体系中,CMC-4A/凹土颗粒对Pb(Ⅱ)、Cd(Ⅱ)、Zn(Ⅱ)的等温吸附数据可以很好地符合Langmuir模型,Pb(Ⅱ)的最大吸附量远大于其他离子的最大吸附量;CMC-4A/凹土颗粒对这3种离子的选择性吸附顺序为Pb(Ⅱ)>Cd(Ⅱ)>Zn(Ⅱ),与元素的电负性大小排序一致。a granular CMC-4A molecular sieve/attapulgite（CMC-4A/ATP） adsorbent for heavy metal ions was synthesized and characterised. The effect of CMC ratio in aqueous solution and calcination temperature by the adsorption of metal ions were discussed. The result suggested that the optimized experimental conditions of the synthesis were the addtion of 0.7 %CMC and calcined at 600 ℃. This study mainly assessed the adsorption capacity of CMC-4A/ATP in single, binary and ternary sorption systems with Pb（Ⅱ）, Cd（Ⅱ）, Zn（Ⅱ） ions. The adsorption isotherms obtained could be well fitted to the Langmuir models. In the competitive adsorption systems, CMC-4A/ATP adsorbed larger amount of Pb（ Ⅱ） than the other two metals. The ranking of adsorption preference of those metals on the cabbage waste is Pb（ Ⅱ）Cd（Ⅱ）Zn（Ⅱ）, which was in accord with the law of electronegativity.

关 键 词：CMC-4A/凹土颗粒 竞争吸附 Pb(Ⅱ) Cd(Ⅱ) Zn(Ⅱ) 

分 类 号：X703[环境科学与工程—环境工程]