Development of Fe 0 biochar composites synergistically activated with MgFe 2 O 4 and Fe 2+through one-step pyrolyzing Fe sludge and MgCl 2 for enhanced aqueous Cr(VI) removal

文献类型： 外文期刊

第一作者： Zhang, Qi

作者： Zhang, Qi;Zhao, Shouping;Huang, Xiaolei;Xiao, Wendan;Chen, De;Ye, Xuezhu;Zhang, Qi;Zhao, Shouping;Huang, Xiaolei;Xiao, Wendan;Chen, De;Ye, Xuezhu;Zhang, Qi;Zhao, Shouping;Huang, Xiaolei;Xiao, Wendan;Chen, De;Ye, Xuezhu;Li, Hui;Li, Jun

作者机构：

关键词： Fe0 biochar composite; Fe sludge; Magnesium ferrite; Cr(VI) removal; One-step pyrolysis; Synergistic activation

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：6.7； 五年影响因子：6.7 ）

ISSN： 2352-1864

年卷期： 2024 年 34 卷

页码：

收录情况： SCI

摘要： The surface passivation layer on Fe 0 severely restricts its reactivity during environmental decontamination. In this study, a new composite - an Fe 0 biochar composite (Fe 0 /BC) coupled with MgFe 2 O 4 and Fe 2+ - was first developed for enhanced Cr(VI) removal by simple co -pyrolysis of Fe sludge (FS) with MgCl 2 . The characterization results demonstrated that MgFe 2 O 4 and Fe 0 could be formed simultaneously at 700 degrees C. However, MgFe 2 O 4 disappeared at temperatures of 800 and 900 degrees C. By varying the flow rate of N 2 and holding time, Fe 0 /BC was further optimized based on the determined MgCl 2 to FS mass ratio (1.9:10.0) and temperature (700 degrees C). The optimal Fe 0 /BC (MBC700 120 -400 - 30) achieved a Cr(VI) removal efficiency of 97.67%, which was 2.43 times higher than that of the unmodified Fe 0 /BC obtained at 700 degrees C. This enhanced reactivity was directly related to the electron transfer of Fe 0 stimulated by MgFe 2 O 4 as well as the conversion of passive corrosion products into Fe 3 O 4 facilitated by soluble Fe 2+ components. The predicted maximum adsorption capacity of MBC700 120 -400 - 30 was 85.43 mg/g (pH = 5) and the removal of Cr(VI) was dominated by chemisorption. The reduction of Cr(VI) to Cr(III) was identified as the principal removal mechanism. Overall, this study demonstrates a novel strategy for developing functional Fe 0 -based materials for water contamination treatment.

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