School of Environmental Science and Engineering, Tianjin Key Lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, China.
Tianjin International Engineering Institute, Tianjin 300072, China.
Sci Total Environ. 2020 Nov 1;741:140492. doi: 10.1016/j.scitotenv.2020.140492. Epub 2020 Jun 24.
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 O 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.
一种创新性的 1D/2D γ-MnOOH-rGO 催化剂通过将 γ-MnOOH 纳米线锚定在 rGO 纳米片上成功合成。通过 PMS/模拟太阳光系统中苯达松的降解来全面评估其催化活性。结果表明，在耦合体系中，γ-MnOOH-rGO 催化剂在 90 分钟内实现了苯达松的 96.1%分解，与 γ-MnOOH 介导体系相比提高了 26.7%。此外，新设计的 γ-MnOOH-rGO 表现出了苯达松去除的稳定性、可回收性和实用性。机理研究表明，γ-MnOOH-rGO 表面暴露了更多的活性位点，为 PMS 的活化和苯达松的降解提供了更多的机会。此外，rGO 可以转移光诱导电子，加速基于自由基的反应。更重要的是，γ-MnOOH-rGO/PMS/模拟太阳光系统中出现了 ∙OH 和 O，它们在苯达松的去除中起着至关重要的作用。展望未来，γ-MnOOH-rGO 在 PMS/光催化体系中对难降解污染物的修复具有广阔的应用前景。
