Mesoporous sulfur-modified iron oxide as an effective Fenton-like catalyst for degradation of bisphenol A

Authors
Du, JiangkunBao, JianguoFu, XiaoyanLu, ChenghangKim, Sang Hoon
Issue Date
2016-05-05
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.184, pp.132 - 141
Abstract
A mesoporous sulfur-modified iron oxide (MS-Fe) was prepared as a heterogeneous H2O2 catalyst for degradation of BPA. The physico-chemical properties of MS-Fe and bare M-Fe were characterized by BET surface area measurement, SEM, XRD, MIR and XPS. Both M-Fe and MS-Fe composites appeared as cubic microparticles with abundant pores and cracks as well as large surface area. As depicted by XRD, EDX and XPS, M-Fe is mainly consisted of hematite while MS-Fe is a kind of S-doped iron oxide with about 5-6% of sulfur element in terms of atomic ratio. In contrast to the poor catalytic activity of bare M-Fe, the MS Fe composites showed greatly improved efficiencies for H2O2 activation for BPA degradation. The high catalytic activity of this new Fenton-like catalyst can be obtained at different initial pH in range of 3.0-9.0. The time evolution of degradation of BPA followed pseudo-first-order kinetics, and the first-order rate constants showed a linear relationship with parameters of initial pH, catalyst dosage and concentration of BPA. However, the H2O2 dosage showed a dual effect on BPA degradation because excessive H2O2 addition lead to scavenging of hydroxyl radicals ((OH)-O-center dot). The investigation of working mechanisms of MS Fe suggested a synergistic effect of homogeneous and heterogeneous degradation reaction, wherein a strong acidic environment, abundant surface-bonded hydroxyl group and electron-mediating effect of sulfur all contributed to fast activation of H2O2. Overall, this new material overcomes the limitation of narrow working pH range and shows a fast oxidation of BPA with a low H2O2 and catalyst dosage, would have a good potential for environmental application. (C) 2015 Elsevier B.V. All rights reserved.
Keywords
HYDROGEN-PEROXIDE; OXIDATIVE-DEGRADATION; EFFICIENT DEGRADATION; DOPED ALPHA-FE2O3; DECOMPOSITION; MECHANISM; NANOPARTICLES; CARBON; WATER; IONS; HYDROGEN-PEROXIDE; OXIDATIVE-DEGRADATION; EFFICIENT DEGRADATION; DOPED ALPHA-FE2O3; DECOMPOSITION; MECHANISM; NANOPARTICLES; CARBON; WATER; IONS; Mesoporous sulfur-modified iron oxide; Bisphenol A; Fenton-like oxidation
ISSN
0926-3373
URI
https://pubs.kist.re.kr/handle/201004/124074
DOI
10.1016/j.apcatb.2015.11.015
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KIST Article > 2016
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