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Title: High surface area DPA-hematite for efficient detoxification of bisphenol A via peroxymonosulfate activation
Authors: Oh, Wen-Da
Lua, Shun-Kuang
Dong, Zhili
Lim, Teik-Thye
Keywords: DRNTU::Engineering::Environmental engineering::Water treatment
Issue Date: 2014
Source: Oh, W.-D., Lua, S.-K., Dong, Z., & Lim, T.-T. (2014). High surface area DPA-hematite for efficient detoxification of bisphenol A via peroxymonosulfate activation. Journal of Materials Chemistry A, 2(38), 15836-15845.
Series/Report no.: Journal of materials chemistry A
Abstract: A novel dipicolinic acid-functionalized hematite (DPA-hematite) with high surface area was prepared by co-precipitation of a Fe(III)–DPA complex. It was used as a catalyst to activate peroxymonosulfate (PMS) for bisphenol A (BPA) detoxification. The XRD, FESEM, TEM and FTIR characterization indicated that nano-sized DPA-hematite with aggregated quasi-nanosphere morphology was obtained with a 1 : 1 ratio of Fe(III) to DPA. Higher catalytic activity of DPA-hematite over other Fe(III)-based catalysts was observed for BPA oxidation in the presence of oxone. The kinetics of BPA removal was investigated using a kinetic model with BPA concentration, initial oxone dosage and surface area of DPA-hematite. For the first time, the acute toxicity of BPA solution over time with elimination of oxone toxicity interference was studied using Vibrio fischeri bacteria and the results indicated that the evolution of acute toxicity was highly dependent on the initial oxone dosage. Under deficit oxone conditions, BPA was completely transformed to by-products along with decreased intrinsic toxicity but ring-opening reactions were barely observed which can be explained based on the dimerization–mineralization degradation pathways. Under excess oxone conditions, the intrinsic toxicity of BPA solution decreased along with ring-opening reactions leading to a greater extent of mineralization. The DPA-hematite can be reused for BPA detoxification for at least three cycles in the presence of 2.0 g L−1 oxone.
ISSN: 2050-7488
DOI: 10.1039/C4TA02758B
Rights: © 2014 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Materials Chemistry A, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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