离子热碳化制备Fe/N共掺杂生物炭及其催化性能研究  

Ion-thermal carbonization of biomass to construct Fe/N-doped biochar for catalytic degradation of organic pollutants

作　　者：季翔宇 刘武军[1] 俞汉青[1] JI Xiang-yu;LIU Wu-jun;YU Han-qing(CAS Key Laboratory of Urban Pollutant Conversion,Department of Environmental Sciences and Engineering,University of Science and Technology of China,Hefei 230026,China;Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中科院城市污染物转化重点实验室,中国科学技术大学环境科学与工程系,安徽合肥230026 [2]中国科学技术大学应用化学系,安徽合肥230026

出　　处：《现代化工》2022年第3期85-91,共7页Modern Chemical Industry

基　　金：国家自然科学基金(21976170)。

摘　　要：以铁基离子液体[BMIm]FeCl_(4)和木质纤维类生物质废弃物为前驱体,采用离子热碳化方法制得铁/氮共掺杂生物炭(Fe-N/BC)催化剂,并对其性质进行了表征。研究了Fe-N/BC催化剂活化过一硫酸盐(PMS)处理有机污染物罗丹明B和双酚A的性能,并对Fe-N/BC催化剂进行了吸附实验、催化动力学实验和自由基淬灭实验。结果表明,Fe-N/BC为包覆有铁金属纳米颗粒的氮掺杂石墨化碳材料,空泡结构和发达的孔隙结构使其具有很强的吸附性能,60 min后才达到吸附平衡,吸附50%的双酚A;加入氧化剂过一硫酸盐后,30 min后对双酚A的降解率达到95.5%,远远快于氮掺杂生物炭(N/BC)材料和生物炭(BC)。Fe-N/BC活化PMS降解双酚A过程中对pH不敏感,反应方式主要通过非自由基路径实现。Using ionic liquid [BMIm]FeCl_(4)and lignocellulosic biomass wastes as precursors, iron/nitrogen co-doped biochar(Fe-N/BC) catalysts are prepared via a two-step ion-thermal carbonization process, and analyzed via various physicochemical methods.The as-prepared Fe-N/BC catalysts are employed to activate permonosulfate(PMS) for degrading rhodamine B and bisphenol A.The adsorption experiments, catalytic kinetics experiments and free radical quenching experiments are carried out to evaluate the catalytic performance of Fe-N/BC catalysts.It is indicated that Fe-N/BC catalysts show a high efficiency in the activation of PMS to degrade organic pollutants, much higher than the biochar materials without Fe or N doping.The degradation process of pollutants by Fe-N/BC activated PMS is insensitive to pH,and non-radical pathway is identified as the main mechanism for the degradation of pollutants.

关 键 词：过一硫酸盐(PMS) 非均相类芬顿催化剂 生物炭 双酚A(BPA) 非自由基路径 

分 类 号：O69[理学—化学]