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Liu, Qian; Deng, Wen-Yong; Zhang, Lie-Yuan; Liu, Chang-Xiang; Jie, Wei-Wei; Su, Rui-Xuan; Zhou, Bin; Lu, Li-Min; Liu, Shu-Wu; Huang, Xi-Gen
Materials, 02/2023, Volume: 16, Issue: 4Journal Article
Biomass-derived raw bamboo charcoal (BC), NaOH-impregnated bamboo charcoal (BC-I), and magnetic bamboo charcoal (BC-IM) were fabricated and used as bio-adsorbents and Fenton-like catalysts for methylene blue removal. Compared to the raw biochar, a simple NaOH impregnation process significantly optimized the crystal structure, pore size distribution, and surface functional groups and increase the specific surface area from 1.4 to 63.0 m /g. Further magnetization of the BC-I sample not only enhanced the surface area to 84.7 m /g, but also improved the recycling convenience due to the superparamagnetism. The maximum adsorption capacity of BC, BC-I, and BC-IM for methylene blue at 328 K was 135.13, 220.26 and 497.51 mg/g, respectively. The pseudo-first-order rate constants at 308 K for BC, BC-I, and BC-IM catalytic degradation in the presence of H O were 0.198, 0.351, and 1.542 h , respectively. A synergistic mechanism between adsorption and radical processes was proposed.
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