铝同晶替代对铁(氢)氧化物表面活性的影响研究进展

Effect of Al Substitution on Surface Reactivity of Iron(Hydr)Oxides:A Review

铝同晶替代现象在铁(氢)氧化物中普遍存在,可改变铁(氢)氧化物的结构、表面特性和反应活性,影响土壤中元素的行为、形态和归趋。运用文献计量法分析了铝同晶替代铁(氢)氧化物的国内外研究现状,分别综述了铝同晶替代对铁(氢)氧化物晶体结构、表面电荷和界面过程的影响,从静电作用、比表面积、位点组成与密度、Fe/Al位点亲和性以及空位缺陷等方面阐明了铝同晶替代对铁(氢)氧化物表面活性和吸附行为的影响机制。在此基础上,提出了未来研究应着眼于构建铝替代量–结构–反应活性定量关系、深入探究铝同晶替代铁(氢)氧化物不同晶面上的界面机制,以及将研究对象与体系过渡到实际土壤等。

Natural iron(hydr)oxides commonly encounters Al substitution for Fe,which alters the microstructure,surface characteristics and reactivity of iron(hydr)oxides,and affects the chemical speciation and fate of elements in the soil.In this paper,the research progress on Al substitution of iron(hydr)oxides was summarized by bibliometrics,the effects of Al substitution on the microstructure,surface charge and interfacial reaction of iron(hydr)oxides were reviewed,and the mechanism of how Al substitution affected the surface adsorption of iron(hydr)oxides was elucidated from the aspects of electrostatic interaction,specific surface area,the composition and density of surface sites,the affinity of Fe/Al sites and vacancy defects.On the above bases,we proposed that future research should focus on the construction of a quantitative relationship of Al-substituted amount-microstructure-reactivity,the analysis of the adsorption mechanism of different crystal faces on Al-substituted iron(hydr)oxides,and the transition of the research object and system to the real soil.