餐厨垃圾水热炭对全(多)氟烷基化合物的吸附性能  

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

作　　者：陈帆 陈江亮 刘雪梅 智悦[1,2] 李伟 王小铭[1,2] CHEN Fan;CHEN Jiang-liang;LIU Xue-mei;ZHI Yue;LI Wei;WANG Xiao-ming(Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400044,China;College of Environment and Ecology,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400044 [2]重庆大学环境与生态学院,重庆400044

出　　处：《中国环境科学》2023年第10期5403-5409,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(52170123)。

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 Kd)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 Kd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.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 Kd)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 Kd values exhibited a positive correlation with the perfluoroalkyl chain length,indicating the significance of hydrophobic interactions in the adsorption of PFAS on AC.

关 键 词：餐厨垃圾 水热炭 全(多)氟烷基化合物 吸附 

分 类 号：X705[环境科学与工程—环境工程]