Adsorption of Basic Dyes Using Walnut Shell-based Biochar Produced by Hydrothermal Carbonization

doi:10.1007/s40242-018-8018-0

Abstract

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 aromati-city, 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.

Key words: Biochar, Adsorption, Walnut shell, Hydrothermal carbonization, Basic dye

KANG Chunli, ZHU Ling, WANG Yixue, WANG Yuhan, XIAO Kunkun, TIAN Tao. Adsorption of Basic Dyes Using Walnut Shell-based Biochar Produced by Hydrothermal Carbonization[J]. Chemical Research in Chinese Universities, 2018, 34(4): 622-627.

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