膨润土-钢渣复合吸附剂对Fe2+的吸附性能

研究了膨润土-钢渣复合吸附剂对模拟酸性矿山废水中Fe²⁺的吸附去除效果、Fe²⁺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Fe²⁺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;Fe²⁺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Fe²⁺中98.62%以残渣态形式存在于复合吸附剂中;复合吸附剂对Fe²⁺的吸附行为符合BET等温吸附模型和准二级动力学模型。

Adsorption capability of bentonite-steel slag composite adsorbent to Fe2+

The removal effect of Fe²⁺ from simulated acid mine wastewater on bentonite-steel slag composite adsorbent,the existing form of Fe²⁺ on the adsorbent surface and the adsorption mechanism were studied. The results show that：In the treatment of simulated Fe²⁺-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 Fe²⁺ 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 Fe²⁺ on the composite adsorbent is accord with the BET isotherm adsorption model and quasi second-order kinetics model.