Efficient degradation of bentazone via peroxymonosulfate activation by 1D/2D γ-MnOOH-rGO under simulated sunlight: Performance and mechanism insight

Ning Li; Rui Li; Yang Yu; Jianhui Zhao; Beibei Yan; Guanyi Chen

doi:10.1016/j.scitotenv.2020.140492

Efficient degradation of bentazone via peroxymonosulfate activation by 1D/2D γ-MnOOH-rGO under simulated sunlight: Performance and mechanism insight

Sci Total Environ. 2020 Nov 1:741:140492. doi: 10.1016/j.scitotenv.2020.140492. Epub 2020 Jun 24.

Authors

Ning Li¹, Rui Li¹, Yang Yu², Jianhui Zhao³, Beibei Yan¹, Guanyi Chen⁴

Affiliations

¹ School of Environmental Science and Engineering, Tianjin Key Lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, China.
² Tianjin International Engineering Institute, Tianjin 300072, China.
³ School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China.
⁴ School of Environmental Science and Engineering, Tianjin Key Lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, China; Georgia Tech Shenzhen Institute, Tianjin University, Shenzhen 518071, China. Electronic address: chen@tju.edu.cn.

PMID: 32886992
DOI: 10.1016/j.scitotenv.2020.140492

Abstract

An innovative 1D/2D γ-MnOOH-rGO catalyst was successfully synthesized by anchoring γ-MnOOH nanowires on rGO nanosheets. Its catalytic activity was comprehensively evaluated by bentazone degradation in PMS/simulated sunlight system. Results showed that the γ-MnOOH-rGO catalyst achieved 96.1% decomposition of bentazone within 90 min in the coupled system, improving by 26.7% compared to that obtained in the γ-MnOOH mediated system. Moreover, the newly-designed γ-MnOOH-rGO exhibited stability, recyclability and practicability for bentazone elimination. Mechanism insight highlighted that more active sites exposed on γ-MnOOH-rGO surface, providing more opportunities for PMS activation and bentazone degradation. Besides, the rGO could transfer photo-induced electrons, accelerating radical-based reactions. More importantly, ∙OH and ¹O₂ appeared in γ-MnOOH-rGO/PMS/simulated sunlight system, which played an overwhelming role in bentazone removal. In prospect, the γ-MnOOH-rGO showed promising potential for refractory contaminants remediation from aquatic environment in PMS/photocatalytic system.

Keywords: Bentazone degradation; Nonradical reactions; PMS/simulated sunlight system; Persulfate radical; γ-MnOOH-rGO.