铁-镧复合氧化物颗粒吸附剂除氟特性的研究

Fluoride removal from water by a granular Fe-La complex hydroxide

对新型铁-镧复合氧化物颗粒吸附剂的比表面积、孔径分布和物相进行了表征,考察了该吸附剂的除氟吸附速率和吸附等温线,分析了pH和共存离子对吸附剂吸附性能的影响。结果表明,该铁-镧复合氧化物颗粒是无定型态体相的微孔材料,比表面积为103.3 m2/g;吸附速率遵从拟二级动力学模型,吸附速率受内扩散和表面吸附的影响;吸附等温线符合Freundlich方程,当氟离子平衡质量浓度为35mg/L时,吸附容量达到30mg/g;吸附的最佳pH为4,共存离子中HPO24-对吸附效果影响最大。

A granular Fe-La complex hydroxide adsorbent has been characterized by measurement of specific surface area and pore distribution,and phase analysis.The granular Fe-La complex hydroxide was a microporous amorphous material with a specific surface area of 103.3m2/g.Batch adsorption of fluoride onto the adsorbent was studied,including measuring adsorption rates and adsorption isotherms and the effects of pH and co-existing ions were investigated.Batch tests showed that the adsorption rate fitted a pseudo-second-order kinetics equation,and the adsorption of fluoride was affected by both intraparticle diffusion and surface adsorption.The adsorption isotherm data were in accordance with the Freundlich model,and the adsorption capacity reached 30 mg/g when the equilibrium concentration was 35 mg/L.The optimal adsorption pH was 4,and the presence of HPO2-4 had a significant adverse effect on fluoride adsorption capacity.