餐厨垃圾水热炭对全(多)氟烷基化合物的吸附性能

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Abstract This study focused on the preparation of activated hydrochar (AC) from high water content food waste through hydrothermal carbonization combined with high temperature activation. Multiple methods were used to characterize the physicochemical properties of the AC. Adsorption experiments and kinetic analysis were conducted to investigate the adsorption behavior of per- and polyfluoroalkyl substances (PFAS), a class of emerging pollutants of global concern, with the aim of providing insights for waste treatment and pollution control. The results showed that the AC possessed a high specific surface area (206.97m²/g) and hydrophobic surface properties, which facilitated the adsorption of PFAS. At environmentally relevant concentrations (~40μg/L), the adsorption distribution coefficients (log K_d) of PFAS on AC ranged from 2.38 to 6.49L/kg, higher than those reported for other biochars. This highlighted the favorable adsorption performance of AC towards the studied PFAS. The Langmuir isotherm adsorption model and the Elovich kinetic model effectively described the adsorption process, suggesting that PFAS adsorption on AC occurred similarly to monolayer chemisorption. Additionally, for PFCA and PFSA, the log K_d values exhibited a positive correlation with the perfluoroalkyl chain length, indicating the significance of hydrophobic interactions in the adsorption of PFAS on AC.

Key words： food waste hydrochar PFAS adsorption

Received: 27 March 2023

PACS:

X705

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	Articles by authors
	CHEN Fan
	CHEN Jiang-liang
	LIU Xue-mei
	ZHI Yue
	LI Wei
	WANG Xiao-ming

Cite this article:

CHEN Fan,CHEN Jiang-liang,LIU Xue-mei等. Adsorption performance of per- and polyfluoroalkyl substances (PFAS) on hydrochar derived from food waste[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5303-5309.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5303

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