Journal
MATERIALS
Volume 16, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ma16041528
Keywords
bamboo charcoal; methylene blue; adsorption; degradation; kinetics
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Bamboo charcoal was impregnated with NaOH and magnetized, leading to increased surface area and improved adsorption and catalytic degradation of methylene blue.
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(2)/g. Further magnetization of the BC-I sample not only enhanced the surface area to 84.7 m(2)/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 k at 308 K for BC, BC-I, and BC-IM catalytic degradation in the presence of H2O2 were 0.198, 0.351, and 1.542 h(-1), respectively. A synergistic mechanism between adsorption and radical processes was proposed.
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