Yu Na, Ma Hanyu, Wen Zhihong, Zhang Wenbin, Chen Jiahao, Yuan Yong, Zhou Lihua
School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, 510006, China.
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
Environ Sci Pollut Res Int. 2023 Jul;30(35):83289-83301. doi: 10.1007/s11356-023-28202-8. Epub 2023 Jun 20.
Carbon-based catalysts for activating persulfate to drive advanced oxidation processes (AOPs) are widely used in wastewater treatment. In this study, Shewanella oneidensis MR-1, a typical ferric reducing electroactive microorganism, was utilized as the raw material of biochar (BC) to prepare a novel green catalyst (MBC). The effect of MBC on activating persulfate (PS) to degrade rhodamine B (RhB) was evaluated. Experimental results showed that MBC could effectively activate PS to degrade RhB to reach 91.70% within 270 min, which was 47.4% higher than that of pure strain MR-1. The increasing dosage of PS and MBC could improve the removal of RhB. Meanwhile, MBC/PS can well perform in a wide pH range, and MBC showed good stability, achieving 72.07% removal of RhB with MBC/PS after 5 cycles. Furthermore, the free radical quenching test and EPR experiments confirmed the presence of both free radical and non-free radical mechanisms in the MBC/PS system, with •OH, SO and O contributing to the effective degradation of RhB. This study successfully provided a new application for bacteria to be used in the biochar field.
用于活化过硫酸盐以驱动高级氧化过程（AOPs）的碳基催化剂在废水处理中被广泛应用。在本研究中，典型的铁还原电活性微生物——希瓦氏菌MR-1被用作生物炭（BC）的原料来制备新型绿色催化剂（MBC）。评估了MBC对活化过硫酸盐（PS）降解罗丹明B（RhB）的效果。实验结果表明，MBC能有效活化PS降解RhB，在270分钟内降解率达到91.70%，比纯菌株MR-1高47.4%。增加PS和MBC的用量可提高RhB的去除率。同时，MBC/PS在较宽的pH范围内都能良好发挥作用，且MBC表现出良好的稳定性，经过5个循环后，MBC/PS对RhB的去除率仍达到72.07%。此外，自由基淬灭试验和电子顺磁共振实验证实了MBC/PS体系中同时存在自由基和非自由基机制，其中•OH、SO和O对RhB的有效降解有贡献。本研究成功为细菌在生物炭领域的应用提供了新途径。
