Synthesis and Application for Pb2+ Removal of a Novel Magnetic Biochar Embedded with FexOy Nanoparticles

IF 2.2 3区综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES

Symmetry-Basel Pub Date : 2025-03-28 DOI:10.3390/sym17040516

Youzhi Yao, Tiancheng Yao, Cheng Qian

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引用次数: 1

Abstract

Biochar (BC) is a widely studied economic and environment-friendly material. However, its application is limited by its underdeveloped pore structure, small specific surface area, low degree of graphitization, and difficulty in being separated from liquids during the application process. Raw cotton contains almost 100% cellulose and has a high yield for preparing biochar. A novel type of magnetic biochar composite was prepared by the impregnation–calcination method using cotton and iron nitrate nonahydrate(Fe(NO3)3·9H2O). The material was characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, thermogravimetric analysis (TG), and specific surface area testing (BET). The results show that FexOy nanoparticles with a uniform morphology and an average particle size of less than 20 nm are embedded in the composite; the saturation magnetization strength of the composite material reaches 21.6 emu/g; and compared to the original biochar, the composite material has a larger specific surface area (326 m2/g). As an adsorbent, the composite material has a fast removal rate for Pb2+ of 95% in 50 min. The Langmuir model calculation results show that the maximum adsorption capacity of the composite for Pb2+ is 252.7 mg/g. FexOy-BC easily achieves solid–liquid separation and can be recycled for Pb2+ wastewater treatment through adsorption–desorption–regeneration.

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feexoy纳米颗粒包埋新型磁性生物炭的合成及其去除Pb2+的应用

生物炭（BC）是一种被广泛研究的经济环保材料。但由于其孔隙结构不发达，比表面积小，石墨化程度低，在应用过程中难以与液体分离，限制了其应用。原棉几乎含有100%的纤维素，在制备生物炭方面产量很高。以棉花和非水合硝酸铁（Fe(NO3)3·9H2O）为原料，采用浸渍-煅烧法制备了一种新型磁性生物炭复合材料。采用扫描电子显微镜（SEM）、能谱（EDS）、透射电子显微镜（TEM）、x射线衍射（XRD）、x射线光电子能谱（XPS）、拉曼光谱、热重分析（TG）和比表面积测试（BET）对材料进行了表征。结果表明：复合材料中嵌入了形貌均匀、平均粒径小于20 nm的feexoy纳米颗粒；复合材料的饱和磁化强度达到21.6 emu/g；与原始生物炭相比，复合材料具有更大的比表面积（326 m2/g）。作为吸附剂，复合材料对Pb2+的去除率在50 min内达到95%。Langmuir模型计算结果表明，复合材料对Pb2+的最大吸附量为252.7 mg/g。FexOy-BC易于实现固液分离，可通过吸附-解吸-再生循环用于Pb2+废水处理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Symmetry-Basel MULTIDISCIPLINARY SCIENCES-

CiteScore

5.40

自引率

11.10%

发文量

2276

审稿时长

14.88 days

期刊介绍： Symmetry (ISSN 2073-8994), an international and interdisciplinary scientific journal, publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided, so that results can be reproduced.