An efficient, economical, and easy mass production biochar supported zero-valent iron composite derived from direct-reduction natural goethite for Cu(II) and Cr(VI) remove
An efficient, economical, and easy mass production biochar supported zero-valent iron composite derived from direct-reduction natural goethite for Cu(II) and Cr(VI) remove
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一种高效、经济且易于大规模生产的生物炭负载零价铁复合材料，源自直接还原天然针铁矿，用于去除 Cu(II) 和 Cr(VI)
DOI：
10.1016/j.chemosphere.2021.131539
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Zhu Jianyu
中科院分区：
文献类型：
--
作者：
Cai Miao;Zeng Jian;Chen Yaozong;He Peng;Chen Fang;Wang Xu;Liang Jinye;Gu Chunyao;Huang Dongli;Zhang Ke;Gan Min;Zhu Jianyu
本研究采用一锅共热解还原法合成了一种新型生物炭负载零价铁（ZVI）复合材料，并用于去除Cu（II）和Cr（VI）。复合材料的原料来源于天然甘蔗渣/稻草和针铁矿。采用扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、热重（TG）和BET分析对生物炭及其负载ZVI复合材料进行表征。批次去除实验的初始pH值和柠檬酸浓度的影响，以及动力学研究和等温实验进行。复合材料对Cu（II）和Cr（VI）的去除效果优于单一生物炭和矿物材料，Cu（II）和Cr（VI）的去除与pH值有关，并通过非均相多层化学吸附进行。电化学分析表明，秸秆生物炭负载ZVI复合材料具有更大的电导率和电子传递速率比纯生物炭和ZVI。红外光谱和X射线光电子能谱（XPS）阐明了吸附机制，表明Cu（II）和Cr（VI）很容易吸附到生物炭表面，然后被ZVI还原。结果表明，生物炭负载ZVI复合材料对重金属污染具有良好的修复效果，且经济、环保，适合大规模生产。
In this study, a novel biochar-supported zero-valent iron (ZVI) composite was synthesised by a one-pot co-pyrolysis reduction method, and was used to remove Cu(II) and Cr(VI). The raw materials for the composite were derived from natural bagasse/straw and goethite. Scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Fourier-transform infrared (FTIR) spectroscopy, thermogravimetry (TG), and Brunauer-Emmett-Teller (BET) analysis were used to characterise the biochar and biochar-supported ZVI composites. Batch removal experiments on the effects of the initial pH and citric acid concentrations were performed as well as kinetic studies and isotherm experiments. The composite materials showed better Cu(II) and Cr(VI) removal performance than single biochar and mineral. The removal of Cu(II) and Cr(VI) is pH-dependent, and proceeds via heterogeneous multilayer chemisorption. Electrochemical analysis revealed that straw biochar-supported ZVI composite exhibited greater electrical conductivity and electron transfer rate than pure biochar and ZVI. FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS) elucidated the uptake mechanism, showing that Cu(II) and Cr(VI) were easily adsorbed onto the biochar surface and were then reduced by ZVI. These results indicate that biochar-supported ZVI composite is effective for heavy metal remediation, which is economical, environment-friendly, and suitable for mass production.