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An economical preparation strategy of magnetic biochar with high specific surface area for efficient removal of methyl orange

文献类型： 外文期刊

作者： Hu, Jian 1 ; Mi, Baobin 1 ; Chen, Long 1 ; Yuan, Yifan 1 ; Zhang, Jilong 1 ; Wu, Fangfang 1 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Sch Chem & Mat Sci, Changsha 410128, Hunan, Peoples R China

2.Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China

3.Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China

关键词： Magnetic biochar; Synthesis condition; Methyl orange; Adsorption mechanisms

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2024 年 276 卷

页码：

收录情况： SCI

摘要： Magnetic biochar (MBC) was obtained from pepper straw by impregnation-microwave pyrolysis method. The pyrolysis temperature and FeCl3 3 impregnation concentration were investigated on the structural properties of MBC and the adsorption of methyl orange (MO) in water. Characterization results showed that pyrolysis temperature and iron species significantly increased the specific surface area of MBC, which could reach the maximum of 2038.61 m2/g, 2 /g, and also provided more active adsorption sites by promoting the generation of graphitized structures and surface polar functional groups. MBC0.2-900 0.2 - 900 was selected as the adsorbent for MO with the maximum adsorption capacity reached 437.18 mg & sdot;g-1, & sdot; g- 1 , 3.4 times higher than the virgin biochar. The adsorption process was dominated by chemisorption as well as spontaneous and exothermic. The adsorption mechanisms included pore-filling interaction, it-it EDA interaction, electrostatic interaction, hydrogen bonding, and Lewis acid-base electron interaction. In addition, MBC also exhibited excellent separability and reusability as a low-cost adsorbent. This study provided some theoretical foundation and technological support for producing high-performance biochar and developing pollutant removal technology in wastewater.

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