膨润土-钢渣复合吸附剂对Fe^2+的吸附性能  

Adsorption capability of bentonite-steel slag composite adsorbent to Fe^2+

作　　者：肖利萍[1,2] 刘晓丹 刘喆 XIAO Liping;LIU Xiaodan;LIU Zhe(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]青岛理工大学环境与市政工程学院,山东青岛266033

出　　处：《化工环保》2020年第4期411-417,共7页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(51474122,51174267);辽宁省教育厅科学技术研究项目(ZL002);辽宁省“百千万人才工程”项目(2014921069)。

摘　　要：研究了膨润土-钢渣复合吸附剂对模拟酸性矿山废水中Fe^2+的吸附去除效果、Fe^2+在吸附剂表面的赋存形态及其吸附机理和规律。结果表明:复合吸附剂在处理含Fe^2+模拟酸性矿山废水时,不仅能释放碱性物质中和酸,且发生了吸附-聚沉协同作用;Fe^2+可与膨润土发生晶格置换,还可通过静电吸附作用形成硅酸盐类矿物相,还有一部分通过配合作用生成多金属氧化物,最后一类是通过化学沉淀作用生成的 Fe(OH)2或Fe(OH)3受热分解而形成Fe2O3;被吸附的Fe^2+中98.62%以残渣态形式存在于复合吸附剂中;复合吸附剂对Fe^2+的吸附行为符合BET等温吸附模型和准二级动力学模型。The removal effect of Fe^2+from simulated acid mine wastewater on bentonite-steel slag composite adsorbent,the existing form of Fe^2+on the adsorbent surface and the adsorption mechanism were studied.The results show that:In the treatment of simulated Fe^2+-containing acid mine wastewater,the composite adsorbent can not only release alkaline substance to neutralize acid,but also has the synergistic effect of adsorption and sedimentation;The lattice replacement of Fe^2+with bentonite,the formation of silicate mineral phase by electrostatic adsorption,the formation of multi metal oxides by coordination,and the generation of Fe2O3 by thermal decomposition of Fe(OH)2 or Fe(OH)3 formed by chemical precipitation occurre in the process;98.62%of the adsorbed Fe2+on the composite adsorbent is residue form;The adsorption of Fe^2+on the composite adsorbent is accord with the BET isotherm adsorption model and quasi secondorder kinetics model.

关 键 词：膨润土 钢渣 复合吸附剂 FE^2+ 吸附机理 赋存形态 

分 类 号：X703[环境科学与工程—环境工程]