Zhang Huimin, Tong Xing, Xiao Huoqing, Wang Hailong, Lu Xiuguo, Zhang Meng
Institute of Environmental Engineering, East China Jiao Tong University, Nanchang, 330013, Jiangxi, China.
Jiangxi Academy of Eco-Environmental Sciences and Planning, Nanchang, 330039, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Apr;30(17):48999-49013. doi: 10.1007/s11356-023-25727-w. Epub 2023 Feb 10.
A magnetic MnFeO/MWNT nanocomposite activated with sodium persulfate (PDS) was investigated for the removal of the widely used antibiotic tetracycline (TC). The best-performing 80 wt.% MnFeO/MWNT nanocomposite was screened for catalytic degradation of TC by comparing the catalytic and adsorption processes. The nanocomposite was evaluated using a series of physical characterizations. The effects of catalyst dosage, PDS dosage, temperature, initial pH, and initial concentration of TC on TC removal were investigated. After the reaction for 90 min, the addition of 4 mM PDS to the 80 wt.% MnFeO/CNT catalyst at 0.5 g/L degraded 78.85% of TC and 51.97% of TOC at an initial TC concentration of 40 mg/L. The reusability of MnFeO/MWNT nanocomposite was evaluated and the structural stability of the material was verified. It was demonstrated that multiple active species (SO, ·OH, ·O, O) were produced in the MnFeO/MWNT/PDS system. The catalytic mechanism was analyzed based on the XPS results. Total organic carbon (TOC) measurement indicated partial TC had completely mineralized. The presumable degradation pathway of TC was proposed according to intermediate products by the LC-MS method.
研究了用过硫酸钠（PDS）活化的磁性MnFeO/MWNT纳米复合材料对广泛使用的抗生素四环素（TC）的去除效果。通过比较催化和吸附过程，筛选出性能最佳的80 wt.% MnFeO/MWNT纳米复合材料用于TC的催化降解。使用一系列物理表征方法对该纳米复合材料进行了评估。研究了催化剂用量、PDS用量、温度、初始pH值和TC初始浓度对TC去除的影响。反应90分钟后，在初始TC浓度为40 mg/L时，向0.5 g/L的80 wt.% MnFeO/CNT催化剂中加入4 mM PDS，可降解78.85%的TC和51.97%的总有机碳（TOC）。评估了MnFeO/MWNT纳米复合材料的可重复使用性，并验证了材料的结构稳定性。结果表明，MnFeO/MWNT/PDS体系中产生了多种活性物种（SO、·OH、·O、O）。基于XPS结果分析了催化机理。总有机碳（TOC）测量表明部分TC已完全矿化。根据液相色谱-质谱法得到的中间产物，提出了TC可能的降解途径。
