Efficient removal of Cr6+ by magnetically modified biochar from aqueous solution:Removal mechanism investigation

IF 5.3 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Arabian Journal of Chemistry Pub Date : 2024-07-31 DOI:10.1016/j.arabjc.2024.105943

Chao Lv , Peng Liu

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引用次数: 0

Abstract

The magnetic biochar is prepared by one-pot method using waste wooden building formwork as feedstock in the existence of the FeCl₃ for Cr⁶⁺ removal form wastewater. Characterization analysis indicates that magnetic biochar exists Fe₃O₄ with specific surface area of the 333.89–496.35 m²/g, contributing to Cr⁶⁺ removal. Cr⁶⁺ removal process can be well analyzed by the Pseudo-second order and Hill models with adsorption capacity of 30.41 mg/g. The adsorption process analysis indicates that Cr⁶⁺ removal mechanism includes surface complexation, electrostatic attraction, reduction and pore filling. The influence of Fe²⁺ on Cr⁶⁺ removal is analyzed, indicating Fe²⁺ participation into Cr⁶⁺ removal by reduction. The magnetic biochar has excellent reusability after three cycles. The Cr⁶⁺ removal process is also investigated using column adsorption experiment, indicating that magnetic biochar has column adsorption amount of the 56.64 mg/g. The economic feasibility of the magnetic biochar is investigated and calculated with the production cost of $2.48/1kg. The waste wooden building formwork is converted into the efficient magnetic biochar for Cr⁶⁺ removal from wastewater.

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磁性改性生物炭从水溶液中高效去除 Cr6+：去除机理研究

磁性生物炭是以废旧木质建筑模板为原料，在存在氯化铁的情况下，通过一锅法制备的，用于去除废水中的铬。表征分析表明，磁性生物炭中存在比表面积为 333.89-496.35 m/g 的 FeO，有助于除铬。通过伪二阶和希尔模型可以很好地分析铬的去除过程，其吸附容量为 30.41 毫克/克。吸附过程分析表明，铬的去除机理包括表面络合、静电吸引、还原和孔隙填充。分析了铁对铬去除的影响，表明铁通过还原作用参与了铬的去除。磁性生物炭经过三次循环后具有良好的重复使用性。还利用柱吸附实验研究了铬的去除过程，结果表明磁性生物炭的柱吸附量为 56.64 mg/g。研究并计算了磁性生物炭的经济可行性，生产成本为 2.48 美元/1 千克。将废弃的木质建筑模板转化为高效的磁性生物炭，用于去除废水中的铬。

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来源期刊

Arabian Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

10.80

自引率

3.30%

发文量

763

审稿时长

63 days

期刊介绍： The Arabian Journal of Chemistry is an English language, peer-reviewed scholarly publication in the area of chemistry. The Arabian Journal of Chemistry publishes original papers, reviews and short reports on, but not limited to: inorganic, physical, organic, analytical and biochemistry. The Arabian Journal of Chemistry is issued by the Arab Union of Chemists and is published by King Saud University together with the Saudi Chemical Society in collaboration with Elsevier and is edited by an international group of eminent researchers.