Oxidative degradation of oxytetracycline by a Fenton-like process with Al0-Gr-Fe0 activated of O2
CHEN Yong1, HU Lu1, TAN Ni1, YANG Xin-yu1, ZENG Hong-wen1, LIU Yong1,2
1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China; 2. Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System, Chengdu 610066, China
Abstract：Fenton oxidation is an effective method to remove antibiotics from aqueous solution. However, there are main disadvantages in the conventional Fenton system. For example, the inconveniences of transport and storage of H2O2, the difficulty of recovering the catalyst, and the acidic pH conditions. To address these issues, this project developed a new functional material novel Fenton-like catalyst (Al0-Gr-Fe0) capable of activating O2 to produce H2O2/·OH in situ was prepared by high energy ball milling-high temperature sintering-liquid phase reduction method. The Al0-Gr-Fe0 could activate O2 to in-situ produce H2O2/·OH. The Al0-Gr-Fe0 was characterized by XRD, SEM, EDS and VSM, respectively. The degradation efficiency and degradation pathways of oxytetracycline (OTC) in water by Al0-Gr-Fe0/O2 system were discussed explored. The results showed that the removal efficiencies of OTC and total organic carbon (TOC) were 100.00% and 92.93%, respectively, after 60min reaction at the initial pH of 6, and Al0-Gr-Fe0 dosage of 2g/L and reaction time of 60min, the degradation efficiency of OTC and the removal efficiency of TOC were 100.00% and 92.93%, respectively. After 4cycles, the degradation efficiency of OTC by Al0-Gr-Fe0 was still decreased to 79.27% after 3 cycles, indicating that Al0-Gr-Fe0 had a good reusability. It was proved by free radical scavenge experiments and free radical capture experiments that ·OH was the main active species for OTC degradation in Al0-Gr-Fe0/O2 system was determined to be ·OH by free radical quenching and capture tests. The excellent degradation mechanism ability of OTC degradation by Al0-Gr-Fe0/O2 system for OTC was attributed to that Al0-Gr-Fe0 the O2 could be selectively reduced O2 into H2O2/·OH; by Al0-Gr-Fe0 and the reduction of Al0 in Al0-Gr-Fe0 could promote Fe cyclinge, thereby effectively improving the catalytic performance activity of Fe and promoting the decomposition of H2O2 to produce ·OH.
陈勇, 胡鹭, 谭旎, 杨昕昱, 曾泓文, 刘咏. Al0-Gr-Fe0活化O2类Fenton氧化降解土霉素的研究[J]. 中国环境科学, 2021, 41(10): 4645-4653.
CHEN Yong, HU Lu, TAN Ni, YANG Xin-yu, ZENG Hong-wen, LIU Yong. Oxidative degradation of oxytetracycline by a Fenton-like process with Al0-Gr-Fe0 activated of O2. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4645-4653.
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