Abstract
Hydrothermal carbon(HC) was prepared from walnut shells, which are abundant in Northeastern China. The prepared HC was used as a precursor to produce nitric acid modified carbon(MC). The hydrothermal carbonization included dehydration and decarboxylation processes wherein the hemicellulose was completely decomposed and the cellulose was partly decomposed, with some oxygen-containing functional groups being produced. The aromaticity, specific surface area and pore content of the HC increased, but its polarity decreased. With 6 mol/L nitric acid and a modification time of 15 min, the specific surface area and pore content decreased, but the proportion of oxygen-containing functional groups on the surface increased significantly, thereby improving the dye adsorption performance. The adsorption of methylene blue and malachite green was best described by the pseudo-second-order kinetic and Langmuir isotherm models. The adsorption capacity of MC was determined to be much larger than that of HC.
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Supported by the Scientific and Technological Project of Jilin Province, China(No.20140101008JC).
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Kang, C., Zhu, L., Wang, Y. et al. Adsorption of Basic Dyes Using Walnut Shell-based Biochar Produced by Hydrothermal Carbonization. Chem. Res. Chin. Univ. 34, 622–627 (2018). https://doi.org/10.1007/s40242-018-8018-0
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DOI: https://doi.org/10.1007/s40242-018-8018-0