Large-flake graphene-modified biochar for the removal of bisphenol S from water: rapid oxygen escape mechanism for synthesis and improved adsorption performance

文献类型： 外文期刊

第一作者： Gao, Yurong

作者： Gao, Yurong;Chen, Hanbo;Meng, Jun;Chen, Wenfu;Gao, Yurong;Fang, Zheng;Lin, Wenhui;Chen, Hanbo;Xie, Yanhai;Bao, Yanping;Zhao, Hongting;Wang, Hailong;Gao, Yurong;Chen, Hanbo;Meng, Jun;Chen, Wenfu;Bhatnagar, Amit;Li, Jianhong;Chen, Junfeng;Wang, Hailong;Wang, Hailong

作者机构： Shenyang Agr Univ, Agron Coll, Shenyang 110866, Peoples R China;Foshan Univ, Biochar Engn Technol Res Ctr Guangdong Prov, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China;Minist Agr & Rural Affairs, Key Lab Biochar & Soil Improvement, Shihezi, Peoples R China;LUT Univ, LUT Sch Engn Sci, Dept Separat Sci, Sammonkatu 12, FI-50130 Mikkeli, Finland;Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China;Qufu Normal Univ, Sch Life Sci, Qufu 273165, Peoples R China;Guangdong Green Technol Co Ltd, Foshan 528100, Peoples R China;Foshan Univ, Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

关键词： Graphene oxide; Engineered biochar; Adsorption; Bisphenol S; Water treatment

期刊名称：ENVIRONMENTAL POLLUTION （ 2022影响因子：8.9； 五年影响因子：9.5 ）

ISSN： 0269-7491

年卷期： 2023 年 317 卷

页码：

收录情况： SCI

摘要： The combined effects of graphene and biochar for enhanced adsorption of organic pollutants have not been demonstrated yet. Therefore, the mechanisms of graphene-modified biochar synthesis and its application to adsorption of contaminants remain unclear. In this study, the effect of flake-size graphene on biochar modification and its bisphenol S (BPS) adsorption performance was explored for the first time. Three sizes of graphene oxide were used as the precursor to prepare graphene/biochar composites using pyrolysis. It was found that the graphene with a small flake size was interspersed in the macropores of biochar, while the biochar was completely or mostly wrapped by the large-sized graphene sheet, which effectively prevented the agglomeration and pore blockage of biochar. Large-flake graphene oxide modified biochar (LGB) showed the highest adsorption capacity towards BPS, exhibiting 2.8 times higher adsorption than pristine biochar. Density functional theory (DFT) calculation suggested that the maximum diffusion barrier of O atoms in graphene coated cellulose (most frequently used biochar representative) could be reduced significantly (similar to 46%) at pyrolysis temperature of 873 K. Taking the advantage of small amount of graphene and enhanced adsorption performance, LGB could be a promising adsorbent for the removal of certain organic pollutants from wastewater and is conducive for the development of high-valued biochar modification.

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