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Efficient degradation of atrazine with porous sulfurized Fe2O3 as catalyst for peroxymonosulfate activation

2019; Elsevier BV; Volume: 259; Linguagem: Inglês

10.1016/j.apcatb.2019.118056

1873-3883

Han Zheng, Jianguo Bao, Ying Huang, Luojing Xiang, Muhammad Faheem, Bangxing Ren, Jiangkun Du, Mallikarjuna N. Nadagouda, Dionysios D. Dionysiou,

Environmental remediation with nanomaterials

In this study, magnetic porous sulfurized Fe2O3 (PS-Fe2O3) composites were prepared through the co-precipitation method and were applied to activate peroxymonosulfate (PMS) for the degradation of emerging contaminants. Characterization results indicated that PS-Fe2O3 catalyst with uniform elemental distribution possessed a large number of micro- and meso- pores. When the molar ratio of FeSO4:S2O32− was 2:1 during the synthesis process, the PS-Fe2O3-2 exhibited the best performance on PMS activation for atrazine (ATZ) removal. The catalytic activity of PS-Fe2O3 catalysts was enhanced with increased sulfurization extent. The effects of catalyst dosage, PMS concentration, pH, and water impurities (i.e. Cl−, HCO3−, NO3− and humic acid) on ATZ degradation were investigated. Both sulfate radicals and hydroxyl radicals were detected in the PS-Fe2O3-2/PMS system, and sulfate radicals played the predominant role for the degradation of ATZ. The cycle of Fe(II)/Fe(III) and surface-bonded hydroxyl group both contributed to the PMS activation, and the reduction of Fe3+ to Fe2+ was significantly accelerated by the low-valent sulfur species (such as sulfite) on the catalyst surface. The transformation products of ATZ in PS-Fe2O3-2/PMS system were monitored on LC/MS, which were probably generated through lateral chain oxidation and dechlorination-hydroxylation. Overall, PS-Fe2O3 has potential to be a feasible catalyst for the removal of organic pollutants from water.