摘要
赤铁矿广泛存在于自然界,不可避免地影响各种污染物的迁移转化。抗坏血酸根与赤铁矿晶面的相互作用表明,抗坏血酸根在赤铁矿{001}晶面的双齿单核配位比在赤铁矿{012}晶面的单齿单核配位更有利于铁的还原溶出过程。抗坏血酸根在赤铁矿不同晶面上的两种不同构型用于催化H2O2分解来降解除草剂甲草胺。结果显示,在赤铁矿{001}晶面的双齿单核比{012}晶面的单齿单核更有利于甲草胺的降解。本研究不仅加深了我们对抗坏血酸根与赤铁矿晶面的相互作用的认识,而且从原子层面阐明了赤铁矿的环境效应。
Hematite is ubiquitous existence in natural environments,and therefore inevitably affects the mobility and transformation of contaminants.The interaction of ascorbate and hematite facets demonstrated that the bidentate mononuclear iron-ascorbate complexes on the {001} facets favored the reduction dissolution processes than the monodentate mononuclear iron-ascorbate counterparts on the {012} facets.The two types of iron-ascorbate complexes on the hematite facets were then used to catalyze the H2O2 decomposition for the degradation of herbicide alachlor.It was found that the bidentate mononuclear iron-ascorbate complexes on the {001} facets exhibited better performance than the monodentate mononuclear counterparts on the {012} facets.This study can deepen our understanding on the interaction of ascorbate and hematite facets,and also shed light on the environmental effects of hematite at the atomic level.
引文
[1]Huang,X.P.;Hou,X.J.;Song,F.H.;Zhao,J.C.;Zhang,L.Z.Environ.Sci.Technol.2016,50:1964.
[2]Huang,X.P.;Hou,X.J.;Zhao,J.C.;Zhang,L.Z.Appl.Catal.B:Environ.2016,181:127.