Abstract
Sulfidation of zero-valent iron(ZⅥ)has attracted broad attention in recent years for improving the se-questration of contaminants from water.However,sulfidated ZⅥ(S-ZⅥ)is mostly synthesized in the aqueous phase,which usually causes the formation of a thick iron oxide layer on the ZⅥ surface and hinders the efficient electron transfer to the contaminants.In this study,an alcohothermal strategy was employed for S-ZⅥ synthesis by the one-step reaction of iron powder with elemental sulfur.It is found that ferrous sulfide(FeS)with high purity and fine crystallization was formed on the ZⅥ surface,which is extremely favorable for electron transfer.Cr(Ⅵ)removal experiments confirm that the rate constant of S-ZⅥ synthesized by the alcohothermal method was 267.1-and 5.4-fold higher than those of un-sulfidated ZVI and aqueous-phase synthesized S-ZⅥ,respectively.Systematic characterizations proved that Cr(Ⅵ)was reduced and co-precipitated on S-ZⅥ in the form of a Fe(Ⅲ)/Cr(Ⅲ)/Cr(Ⅵ)composite,suggesting its environmental benignancy.
基金项目
National Key Research and Development Program of China(2019YFC1806203)
维普
万方数据