Persulfate adsorption and activation by carbon structure defects provided new insights into ofloxacin degradation by biochar
Persulfate adsorption and activation by carbon structure defects provided new insights into ofloxacin degradation by biochar
复制标题
碳结构缺陷对过硫酸盐的吸附和活化为生物炭降解氧氟沙星提供了新的见解
DOI：
10.1016/j.scitotenv.2021.150968
复制
发表时间：
2022
影响因子：
9.8
通讯作者：
Pan Bo
中科院分区：
文献类型：
--
作者：
Li Hao;Liu Yi;Jiang Feng;Bai Xing;Li Huijie;Lang Di;Wang Lin;Pan Bo
制备了在持久性自由基（PFR）、含氧官能团和缺陷结构方面存在显着差异的纤维素和木质素衍生的生物炭，以探索生物炭介导的过硫酸盐（PS）活化的机制。 EPR自旋捕获和猝灭技术结合降解实验证实，缺陷结构可以激活PS产生超氧阴离子（O2•−），超氧阴离子（O2•−）转化为单线态氧（1O2），特别是在酸性条件下。1O2主导氧氟沙星（OFL，一种氟喹诺酮类抗生素）的降解。采用改进的碘量测量法对生物炭上吸附的 PS 进行直接定量。 PS 的吸附量与 OFL 的降解一致，并且反应过程中测量的电流表明 PS 吸附是 PS 活化的先决条件，这在以前的研究中可能被忽略。本研究结果强调了生物炭上缺陷结构和 PS 吸附对于 PS 活化的关键作用。
Cellulose and lignin derived biochars with significant differences in persistent free radicals (PFRs), oxygen-containing functional groups, and defective structure were prepared to explore the mechanism of biochar mediated persulfate (PS) activation. EPR spin trapping and quenching technique coupled with degradation experiments confirmed that the defective structures could activate PS to generate superoxide anions (O2•−), which was converted to singlet oxygen (1O2), especially in the acidic condition.1O2dominated the degradation of ofloxacin (OFL, a fluoroquinolone antibiotic). An improved iodometric measurement was applied for direct quantification of adsorbed PS on biochar. The amounts of adsorbed PS were consistent with the degradation of OFL and the measured electric current during the reaction indicated that PS adsorption was a prerequisite for PS activation, which may be neglected in previous studies. The results of this study highlighted the key roles of defective structure and adsorption of PS on biochar for the activation of PS.