Highly reactive iron/nickel bimetallic biochar composites for highly efficient remediation of Cr(vi)†

IF 2.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

New Journal of Chemistry Pub Date : 2025-02-04 DOI:10.1039/D5NJ00107B

Runhong Zhu, Yunlong Shi, Yi Zhou, Yi Xia, Qin Qi, Xiaojie Liang, Meijuan Kuang, Zhenya Jia, Mengyue Wang and Changjiang Yu

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Abstract

In this study, a type of FeNi alloy embedded in biochar (BC) was prepared by a simple, efficient, and pollution-free method to form core–shell type BC@FeNi magnetic materials (BC@FeNi-T-X). The reduction behavior of Fe³⁺ and Ni²⁺ during preparation was analyzed, showing their transformation from ionic states to oxidized states, forming metal monomers and alloys. Increasing the Ni content in the SA–Fe³⁺/Ni²⁺ gel led to the formation of Fe_0.64Ni_0.36 and (Fe,Ni) alloys. Mechanistic insights were obtained through adsorption kinetics and isotherm data fitting and by analyzing composite changes before and after Cr(VI) adsorption. BC@FeNi-900-3 exhibited superior corrosion performance compared to the Fe biochar composite (BC@Fe-900-3), enhancing Cr(VI) reduction. Mechanistic studies revealed that Cr(VI) removal by BC@FeNi-900-3 primarily involved (i) Cr(VI) reduction to Cr(III) by Fe_0.64Ni_0.36 and Fe, (ii) Cr(VI) reduction to Cr(III) by Fe²⁺, (iii) Cr(VI) reduction to Cr(III) by H˙ generated via Fe_0.64Ni_0.36 corrosion, and (iv) Cr(VI) adsorption by BC@FeNi-900-3.

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高效修复Cr（vi）†的高活性铁/镍双金属生物炭复合材料

本研究采用一种简单、高效、无污染的方法制备了一种FeNi合金包埋在生物炭（BC）中，形成核壳型BC@FeNi磁性材料（BC@FeNi-T-X）。分析了制备过程中Fe3+和Ni2+的还原行为，表明它们从离子态转变为氧化态，形成金属单体和合金。随着SA-Fe3 +/Ni2+凝胶中Ni含量的增加，形成fe0.64、ni0.36和（Fe,Ni）合金。通过吸附动力学和等温线数据拟合以及分析吸附Cr（VI）前后复合材料的变化，获得了机理见解。BC@FeNi-900-3与铁生物炭复合材料（BC@Fe-900-3）相比，表现出更好的腐蚀性能，增强了Cr（VI）的还原。机理研究表明，BC@FeNi-900-3对Cr（VI）的去除主要涉及(i) Fe0.64Ni0.36和Fe将Cr（VI）还原为Cr(III), (ii) Fe2+将Cr（VI）还原为Cr(III), (III) Fe0.64Ni0.36腐蚀产生的H˙将Cr（VI）还原为Cr(III)，以及（iv） BC@FeNi-900-3吸附Cr（VI）。

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