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Preparation of biochar adsorption material from walnut shell by supercritical CO2 pretreatment by Zitong Zhuang; Yanbing Liu; Wenwen Wei; Jinwen Shi; Hui Jin is a Environmental Science article available to read on EtoBox.

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## Abstract In order to treat dyes in the wastewater of the printing industry and to reutilize walnut shell (WS) waste generate economic benefits, supercritical carbon dioxide (SC-CO~2~) pretreatment technology was developed to prepare porous biochar as a precursor for adsorption material. Orthogonal experiments were conducted at the temperatures of 200, 300, and 400 °C with durations of 20, 40, and 60 min, and a control group was set up using N~2~ pretreatment. Then, KOH activation was employed to prepare biochar adsorption material. The biochars were analyzed and characterized using TGA, BET, SEM, FT-IR, and XRD, and the liquid and gas phase products of the pretreatment process were analyzed semi-quantitatively and quantitatively using GC–MS and gas chromatography. Methylene blue (MB) dye was selected as an indicator to measure the adsorption capacity of biochar, and adsorption kinetics were analyzed based on the data. The results indicate that pretreatment with SC-CO~2~ effectively enhanced the performance and yield of the activated carbon. The highest specific surface area increased by 18%, and the maximum adsorption of MB increased by 23% compared to the N~2~ control group. Th

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Author

Zitong Zhuang; Yanbing Liu; Wenwen Wei; Jinwen Shi; Hui Jin

Publisher

Springer Science and Business Media LLC

Published

2024

Language

EN

Field

Environmental Science (Physical Sciences)