Mg/Fe金属氧化物吸附水体中硫酸根机理研究

摘要

以Mg/Fe金属氧化物作为吸附剂去除水体中超标SO42-，通过吸附动力学、初始pH值变化、 XRD和FT-IR表征等手段研究吸附机理。结果表明：动力学吸附满足拟二级动力学模型，反应主要为化学反应控制，层间扩散模型多次的变化过程表明反应是复杂的。在不同的初始pH值条件下吸附剂都具有较高的吸附SO42-能力，表明反应不仅仅包括表面吸附和离子交换；结合XRD、 FT-IR表征表明吸附机理包括表面吸附、离子交换和结构重建。%Mg/Fe metal oxide was employed as adsorbent to remove excessive SO42- in water, and the ad-sorption mechanism was studied through aspects of adsorption kinetics, initial pH value variation, XRD and FT-IR characterization. The results showed that, the adsorption kinetics fit pseudo-second-order kinetic model, showing the reaction was chemical controlled. The multiple changing process of the intraparticle diffusion model indicated that the reaction was complicated. The adsorbent had high adsorption capacity on SO42-under different initial pH value conditions, which made it clear that the reaction was not just surface adsorption and ions ex-change. XRD and FT-IR characterization proved that the adsorption mechanism included surface adsorption, ions exchange and structure reconstruction.