Superoxide radical mediated Mn(III) formation is the key process in the activation of peroxymonosulfate (PMS) by Mn-incorporated bacterial-derived biochar

被引:101
作者
Gao, Bixia [1 ]
Zhu, Simeng [1 ]
Gu, Jialiang [1 ]
Liu, Yang [1 ]
Yi, Xianliang [1 ]
Zhou, Hao [1 ]
机构
[1] Dalian Univ Technol, Sch Ocean Sci & Technol, Key Lab Ind Ecol & Environm Engn, Minist Educ, Panjin Campus, Panjin, Peoples R China
基金
中国国家自然科学基金;
关键词
Bacteria; Biochar; Peroxymonosulfate; Superoxide; Advanced oxidation; ACID ORANGE 7; NONRADICAL ACTIVATION; ORGANIC POLLUTANTS; DEGRADATION; OXIDATION; EFFICIENCY; MECHANISM; PERSULFATE; CATALYSTS; HYDROXYL;
D O I
10.1016/j.jhazmat.2022.128549
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Biochar was used as a heterogeneous activator for peroxymonosulfate (PMS), and the activation performance strongly depended on the structure, functional groups, and modification of the biochar. In this study, a new type of modified biochar was synthesized by utilizing the Mn(II) adsorption capacity of bacteria. After one-step py-rolysis of Mn(II)-adsorbed bacterial cells at 800 degrees C, a Mn-incorporated bacterial-derived biochar (Mn-BBC) was successfully produced. It exhibited structural heterogeneity, with MnO located at the surface of the BBC matrix, as shown on the result of SEM and XRD. Compared to BBC, Mn-BBC showed a 10-fold increase (0.0727 min(-1) versus 0.0069 min(-1)) of pollutant removal rate. In addition, it also showed anti-interference capacity against common water matrix (except 10 mM CO32-) and great stability/reusability. Chemical quenching, electron spin resonance, and pyrophosphate trapping indicated an indirect but important role of the superoxide, formed during the self-decomposition of PMS. The MnO on Mn-BBC can be oxidized by superoxide to produce surface Mn (III), which then binds to PMS and forms a surface complex. This complex promotes electron transfer from the pollutant to the Mn-BBC, facilitating the oxidation of the contaminants. Overall, this study confirmed the PMS activation capacity and mechanism of Mn-BBC, which expands the application of BBC-based materials derived from metal-adsorbed microbes.
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页数:12
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