餐厨垃圾水热炭对全(多)氟烷基化合物的吸附性能

陈帆; 陈江亮; 刘雪梅; 智悦; 李伟; 王小铭

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5303-5309.

固体废物

餐厨垃圾水热炭对全(多)氟烷基化合物的吸附性能

陈帆¹, 陈江亮¹, 刘雪梅¹, 智悦^1,2, 李伟^1,2, 王小铭^1,2

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Adsorption performance of per- and polyfluoroalkyl substances (PFAS) on hydrochar derived from food waste

CHEN Fan¹, CHEN Jiang-liang¹, LIU Xue-mei¹, ZHI Yue^1,2, LI Wei^1,2, WANG Xiao-ming^1,2

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摘要

以高湿餐厨垃圾为对象，通过水热碳化结合高温活化制备水热炭（AC）.采用多种表征手段对水热炭的理化性质进行刻画，并对一类全球关注的新污染物——全（多）氟烷基化合物（PFAS）进行吸附实验及动力学分析，以期为“以废治污”提供新思路.结果显示，经过活化处理的水热炭具有较高的比表面积（206.97m²/g）和疏水表面特性，有利于与PFAS的吸附结合.在环境相关浓度下（~40μg/L），PFAS在AC上的吸附分配系数（log K_d）在2.38~6.49L/kg范围内，高于其他生物炭的报道结果，说明AC对目标PFAS具有良好的吸附性能.吸附过程较符合Langmuir等温吸附模型及Elovich动力学模型，证明PFAS在AC上的吸附从机理上近似单分子层化学吸附过程.此外，对于PFCA和PFSA，log K_d值与全氟烷基链长呈正相关，表明疏水作用在AC与PFAS的吸附过程中发挥重要作用.

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.

导出引用

陈帆, 陈江亮, 刘雪梅, 智悦, 李伟, 王小铭. 餐厨垃圾水热炭对全(多)氟烷基化合物的吸附性能[J]. 中国环境科学. 2023, 43(10): 5303-5309

CHEN Fan, CHEN Jiang-liang, LIU Xue-mei, ZHI Yue, LI Wei, WANG Xiao-ming. Adsorption performance of per- and polyfluoroalkyl substances (PFAS) on hydrochar derived from food waste[J]. China Environmental Science. 2023, 43(10): 5303-5309

中图分类号： X705

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