Stabilization and Utilization of Pyrite under Light Irradiation: Discussion of Photocorrosion Resistance

ACS Omega
Qian ZhangXiaohua Shu

Abstract

The control of pyrite (FeS2) oxidation from a source is a problem of great concern on treatment of acid mine drainage (AMD). Compared with air and water, the effect of light on pyrite oxidation has not attracted enough attention. However, we found that pyrite photocorrosion in the light promoted the oxidation of pyrite. Herein, we introduce a method of coating pyrite with graphene oxide (GO), which can inhibit the oxidation and photocorrosion of pyrite while it can also degrade organic pollutants. The characterization results show that a covalent bond forms between the GO and pyrite. The stable and uniform GO coating prevents the permeation of O2 and H2O and promotes the transfer of photogenerated electrons. Moreover, it changes the conduction band (CB) and valence band (VB) levels of GO-pyrite. All of these are vital for preventing the corrosion of pyrite and promoting its photocatalytic ability. More importantly, the effect of CB and VB levels on the oxidized species was discussed. The inhibition of photocorrosion is achieved by the reaction of GO with the photoinduced h+, •OH, and •O2-. The study provides insights for source treatment of AMD under light and the reuse of massive abandoned pyrite.

References

Jan 31, 2007·Chemical Reviews·David Rickard, George W Luther
Jul 30, 2015·Journal of the American Chemical Society·Kaifeng WuTianquan Lian
Feb 25, 2017·Journal of the American Chemical Society·Mengye WangYang Chai
Apr 24, 2019·Proceedings of the National Academy of Sciences of the United States of America·Anhuai LuMichael F Hochella

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Methods Mentioned

BETA
X-ray
transmission electron microscopy
scanning electron microscopy
ESR

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