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Novel ball-milled biochar-vermiculite nanocomposites effectively adsorb aqueous As(Ⅴ).

ABSTRACT: Ball milling was used to fabricate a nanocomposite of 20% hickory biochar (600 °C) and 80% expanded vermiculite (20%-BC/VE). This novel composite adsorbent had much higher removal of As(V) from aqueous solutions than ball-milled biochar and expanded vermiculite. Characterization of these adsorbents showed that the enhanced As(V) adsorption was ascribed to much larger surface area and pore volume (2-6 times), notable changes in crystallinity, activation of cations, and increased functional groups in the nanocomposite compared with the ball-milled products of their pristine counterparts. The As(V) adsorption process by the 20%-BC/VE fitted well with the pseudo-second-order kinetic model (R²= 0.990) and Langmuir isotherm model (R²= 0.989) with a maximum adsorption capacity of 20.1 mg g^-1. The 20%-BC/VE best performed at pH about 6. The adsorption efficiency was not sensitive to the competition of NO₃^-, Cl^-, SO₄^2-, as well as the coexistence of humic acid. However, the adsorption capacity for As(V) was significantly reduced by coexisting with PO₄^3-. The 20%-BC/VE composite can potentially serve as a superior low-cost adsorbent for As(V) removal in real-world applications.

SUBMITTER: Li F

PROVIDER: S-EPMC11346315 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Novel ball-milled biochar-vermiculite nanocomposites effectively adsorb aqueous As(Ⅴ).

Li Fang F Wan Yongshan Y Chen Jianjun J Hu Xin X Tsang Daniel C W DCW Wang Hailong H Gao Bin B

Chemosphere 20200708

Ball milling was used to fabricate a nanocomposite of 20% hickory biochar (600 °C) and 80% expanded vermiculite (20%-BC/VE). This novel composite adsorbent had much higher removal of As(V) from aqueous solutions than ball-milled biochar and expanded vermiculite. Characterization of these adsorbents showed that the enhanced As(V) adsorption was ascribed to much larger surface area and pore volume (2-6 times), notable changes in crystallinity, activation of cations, and increased functional groups ...[more]

PMID: 32663674

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Dataset Information

Novel ball-milled biochar-vermiculite nanocomposites effectively adsorb aqueous As(Ⅴ).

Publications

Novel ball-milled biochar-vermiculite nanocomposites effectively adsorb aqueous As(Ⅴ).

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