基于生物质基碳纳米片的水污染物氧化脱除

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Abstract The porous two-dimensional carbon nanosheets with high graphitization and defect sites, designated M-C and M-N, were successfully synthesized via molten salt-assisted pyrolysis of glucose, with oxysalts (K₂CO₃ or KNO₃) as additives, respectively. The oxysalts significantly enhanced the specific surface area of the carbon nanosheets. Particularly, KNO₃ promoted nitrogen doping in M-N, resulting in a maximum adsorption capacity for acid orange 7 (AO7) of 480.77mg/g, surpassing that of biochar (BC) from direct pyrolysis and M-BC from molten salt-assisted pyrolysis without oxysalts. The adsorption and catalytic degradation of AO7 removal over carbon materials exhibited a synergistic effect. The catalytic activity of M-N in peroxymonosulfate (PMS) activation was 22.64times that of M-BC and 33.48times that of BC. Additionally, the impact of nitrogen doping and other structural defects on the non-radical pathway-dominated catalytic processes was preliminarily assessed using density functional theory (DFT) calculations. This study indicates that oxysalts can significantly reduce the amount of molten salt required in the preparation of carbon nanosheets, and also provides theoretical guidance for developing bifunctional biomass-based carbon materials for highly efficient organic pollutants adsorption and PMS activation.

Key words： carbon nanosheet pyrolysis adsorption catalyst advanced oxidation

Received: 13 June 2024

PACS:

X703.5

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	HAO Rong-jiang
	GU Xiang-yu
	LI Song-geng

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HAO Rong-jiang,GU Xiang-yu,LI Song-geng. Oxidative removal of water pollutants based on biomass-derived carbon nanosheets[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 144-157.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/144

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