标題: Bamboo-derived hydrophobic porous graphitized carbon for adsorption of volatile organic compounds

作者: Rong, Y (Rong, Yang); Pan, C (Pan, Cong); Song, KX (Song, Kexin); Nam, JC (Nam, Jong Chol); Wu, F (Wu, Feng); You, ZX (You, Zhixiong); Hao, ZP (Hao, Zhengping); Li, JJ (Li, Jinjun); Zhang, ZS (Zhang, Zhongshen)

來源出版物: CHEMICAL ENGINEERING JOURNAL 卷: 461 文獻号: 141979 DOI: 10.1016/j.cej.2023.141979 提前訪問日期: FEB 2023 出版年: APR 1 2023

摘要: Biomass-derived activated carbons (BACs) are often used as green adsorbents for the removal of VOCs, however, their abundant surface functional groups severely reduced their adsorption selectivity under humid conditions. In this study, hydrophobic bamboo-derived porous graphitized carbons (BPGCs) were prepared using a combined catalytic graphitization method. The optimal micro-mesoporous BPGC had a large specific surface area of 2181 m2/g and a low surface O/C ratio of 0.038. Under dry conditions, its adsorption capacities for toluene, cyclo-hexane and ethanol were 6.7, 3.8 and 2.4 mmol/g, respectively. At 80 % relative humidity, its adsorption ca-pacities for toluene and cyclohexane remained 82 % and 66 %, while the uptake of ethanol even increased by 33 %. In the two-component adsorption test, BPGC showed a high selectivity for toluene adsorption over ethanol, with 198 times more toluene than ethanol. The adsorption mechanism at the microscopic molecular level was revealed by DFT calculation. The abundant pi electrons and high polarizability of BPGC allow for strong pi-pi interactions and dispersion forces with non-polar organics, while the abundant oxygen-containing groups on BAC have strong adsorption force on water. The absorption of ethanol by capillary condensed water in mesopores of BPGC may contribute to its increased uptake under humid conditions. BPGC allowed for faster adsorption ki-netics than activated carbon. More than 90 % of the adsorbed toluene was desorbed from BPGC at 90 degrees C. Owing to abundant renewable raw materials, excellent hydrophobicity and desirable textural properties, BPGCs may be promising adsorbents.

作者關鍵詞: Biomass; Biochar; Porous graphitized carbon; Adsorption; Volatile organic compounds; DFT calculation

地址: [Rong, Yang; Pan, Cong; Song, Kexin; Nam, Jong Chol; Wu, Feng; You, Zhixiong; Li, Jinjun] Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.

[Hao, Zhengping; Zhang, Zhongshen] Univ Chinese Acad Sci, Res Ctr Environm Mat & Pollut Control Technol, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 101408, Peoples R China.

通訊作者地址: Li, JJ (通訊作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.

Zhang, ZS (通訊作者)，Univ Chinese Acad Sci, Res Ctr Environm Mat & Pollut Control Technol, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 101408, Peoples R China.

電子郵件地址: lijinjun@whu.edu.cn; zszhang@ucas.ac.cn

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