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Catalytic potential of CuFe 2 O 4 /GO for activation of peroxymonosulfate in metronidazole degradation: study of mechanisms
Journal of Environmental Health Science and Engineering ( IF 3.4 ) Pub Date : 2020-09-07 , DOI: 10.1007/s40201-020-00518-4
Roghayeh Noroozi 1 , Mitra Gholami 1, 2 , Mahdi Farzadkia 1, 2 , Ahmad Jonidi Jafari 1, 2
Affiliation  

Application of magnetite nanoparticles (CuFe2O4/GO) were anchored on graphene oxide (GO), as a Heterogeneous nanocomposite for activating of peroxymonosulfate (PMS) into Metronidazole (MNZ) destruction. The effect of solution pH, reaction time, effectiveness of water matrix components and trapping factors, different catalyst concentrations, PMS and contaminants were evaluated as operating factors on the efficiency of MNZ degradation. Also, mineralization, stability, reactivity and Recycling tests of the catalyst, and the degradation kinetics were performed. MNZ degradation and mineralization were obtained under optimal conditions (0.2 g/L catalyst, pH = 5, 30 mg/L MNZ and 2 mM PMS), 100% and 41.02%, respectively over 120 min. Leaching of Fe and Cu was found <0.2 mg/L for CuFe2O4/GO showed a high stability of catalyst, and a significant recyclability was achieved CuFe2O4/GO within 5 times consecutive use. MNZ degradation affected by anions was reduced as follows: HCO3 > NO3 > Cl > SO42−. The experimental data were very good agreement with pseudo-first-order kinetic model, and during quenching tests SO4•- radicals played a dominant role in the degradation process of MNZ. As a result, the CuFe2O4/GO/PMS system can be described as a promising activation of PMS in MNZ degradation, due to its high stability, reusability and good catalyst reactivity, and the production of reactive species simultaneously.



中文翻译:

CuFe 2 O 4 /GO 在甲硝唑降解中活化过硫酸盐的催化潜力:机制研究

磁铁矿纳米颗粒 (CuFe 2 O 4 /GO) 的应用被锚定在氧化石墨烯 (GO) 上,作为一种多相纳米复合材料,用于将过硫酸盐 (PMS) 活化为甲硝唑 (MNZ) 破坏。溶液 pH 值、反应时间、水基质组分的有效性和捕集因子、不同的催化剂浓度、PMS 和污染物被评估为对 MNZ 降解效率的操作因素。此外,还进行了催化剂的矿化、稳定性、反应性和回收试验,以及降解动力学。在最佳条件下(0.2 g/L 催化剂,pH = 5、30 mg/L MNZ 和 2 mM PMS)、100% 和 41.02%,分别在 120 分钟内获得了 MNZ 降解和矿化。发现 Fe 和 Cu 的浸出对于 CuFe 来说 <0.2 mg/L2 O 4 /GO表现出催化剂的高稳定性,连续使用5次后CuFe 2 O 4 /GO实现了显着的可回收性。受阴离子影响的 MNZ 降解减少如下:HCO 3 -  > NO 3 -  > Cl -  > SO 4 2-。实验数据与拟一级动力学模型非常吻合,在淬火试验中SO 4 •-自由基在 MNZ 的降解过程中起主导作用。因此,CuFe2O4/GO/PMS 系统由于其高稳定性、可重复使用性和良好的催化剂反应性,以及同时产生活性物种,可以被描述为在 MNZ 降解中 PMS 的有希望的活化。

更新日期:2020-09-08
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