4.7 Article

Iron-sulphur transformation control for enhancing Cr(VI) removal in flake and nanoscale porous pyrrhotite (Fe7S8) added wastewater

期刊

JOURNAL OF HAZARDOUS MATERIALS
卷 436, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129079

关键词

Fe7S8; Cr(VI); Reduction; Adsorption; Fe3+/Fe2+ circulation

资金

  1. National Key Research and Development Plan [2019YFC1805800, 2020YFC1808200]
  2. National Natural Science Foundation of China [41877377, 41907318, 41907165, 42077401, 42177386]
  3. Innovation Program of Shanghai Municipal of Science and Technology Commission [19DZ1205200, 19DZ1205300, 19010500200]
  4. Shu Guang Project - Shanghai Municipal Education Commission [19SG35X]
  5. Shanghai Education Development Foundation

向作者/读者索取更多资源

A novel porous pyrrhotite amendment was synthesized for efficiently removing Cr(VI) by controlling and optimizing iron-sulfur transformation, achieving significant enhancement in removal efficiency.
Hexavalent chromium (Cr(VI)) contaminated wastewater should be addressed efficiently in the environmental field. In previous applications, nano iron sulfides amendment has not been well controlled for iron-sulfur transformation. In this study, the novel flake and nanoscale porous pyrrhotite (Fe7S8) (FNPP) amendment was synthesized. The iron-sulphur transformation of FNPP was controlled and optimized for enhancing Cr(VI) removal. The specific surface area and average pore diameter of the FNPP amendment reached 115.7 m(2)/g and 2.1 nm. The maximum adsorption capacity of total chromium reached 66.3 mg/g. The optimized iron-sulphur transformation condition was an initial FNPP and Cr(VI) molar ratio of 8, pH at 5.6, in which the Cr(VI) removal reached 96.5% and all producing S2- was utterly consumed. It is confirmed that S2- fast induced Fe3+/Fe2+ circulation and FNPP has a speedier adsorption rate for Cr(III) than Cr(VI). Fe2+ and S2- mediated the Cr(VI) reduction to Cr(III), thus, much faster Cr(VI) removal was achieved. High efficiency removal mechanism of Cr(VI) was combined with surface adsorption/reduction and solution reduction/precipitation. The research demonstrated that controlling and optimizing the iron-sulphur transformation of Fe7S8 amendment can significantly enhance Cr(VI) removal.

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