Citation: Zhongsen Wang, Lijun Qiu, Yunhua Huang, Meng Zhang, Xi Cai, Fanyu Wang, Yang Lin, Yanbiao Shi, Xiao Liu. Alcohothermal synthesis of sulfidated zero-valent iron for enhanced Cr(Ⅵ) removal[J]. Chinese Chemical Letters, ;2024, 35(7): 109195. doi: 10.1016/j.cclet.2023.109195 shu

Alcohothermal synthesis of sulfidated zero-valent iron for enhanced Cr(Ⅵ) removal

Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China

liuxiao71@ccnu.edu.cn

Received Date: 27 June 2023
Revised Date: 21 September 2023
Accepted Date: 11 October 2023
Available Online: 13 October 2023

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Sulfidation of zero-valent iron (ZVI) has attracted broad attention in recent years for improving the sequestration 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.
- Zero-valent iron,
- Sulfidation,
- Alcohothermal method,
- Cr(Ⅵ) removal
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