Activation of sodium persulfate by magnetic carbon xerogels (CX/CoFe) for the oxidation of bisphenol A: Process variables effects, matrix effects and reaction pathways

WATER RESEARCH

卷:124

Article

Outsiou, Alexandra¹  Frontistis, Zacharias¹  Ribeiro, Rui S.^2,3  Antonopoulou, Maria⁴  Konstantinou, Ioannis K.⁵  Silva, Adrian M. T.³  Faria, Joaquim L.³  Gomes, Helder T.²  Mantzavinos, Dionissios¹ 

[1] Univ Patras, Dept Chem Engn, Caratheodory 1,Univ Campus, GR-26504 Patras, Greece

[2] Inst Politecn Braganca, Escola Super Tecnol & Gestao, LSRE LCM, Campus Santa Apolonia, P-5300253 Braganca, Portugal

[3] Univ Porto, Fac Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Oporto, Portugal

[4] Univ Patras, Dept Environm & Nat Resources Management, 2 Seferi St, GR-30100 Agrinion, Greece

[5] Univ Ioannina, Dept Chem, Lab Ind Chem, GR-45110 Ioannina, Greece

关键词: Chloride;    Endocrine disruptors;    Fenton-like;    Intermediates;    Operating parameters;    Radicals;   

DOI  :  10.1016/j.watres.2017.07.046

来源: Elsevier

【 摘 要 】

An advanced oxidation process comprising sodium persulfate (SPS) and a novel magnetic carbon xerogel was tested for the degradation of bisphenol A (BPA), a model endocrine-disrupting compound. The catalyst, consisting of interconnected carbon microspheres with embedded iron and cobalt micropartides, was capable of activating persulfate to form sulfate and hydroxyl radicals at ambient conditions. The pseudo-first order degradation rate of BPA in ultrapure water (UPW) was found to increase with (i) increasing catalyst (25-75 mg/L) and SPS (31-250 mg/L) concentrations, (ii) decreasing BPA concentration (285-14,200 mu g/L), and (iii) changing pH from alkaline to acidic values (9-3). Besides UPW, tests were conducted in drinking water, treated wastewater, groundwater and surface water; interestingly, the rate in UPW was always lower than in any other matrix containing several organic and inorganic constituents. The effect of natural organic matter (in the form of humic acids) and alcohols was detrimental to BPA degradation owing to the scavenging of radicals. Conversely, chlorides at concentrations greater than 50 mg/L had a positive effect due to the formation and subsequent participation of chlorine-containing radicals. Liquid chromatography time-of-flight mass spectrometry was employed to identify major transformation by-products (TBPs) of BPA degradation in the absence and presence of chlorides; in the latter case, several chlorinated TBPs were detected confirming the role of Cl-related radicals. Based on TBPs, main reaction pathways are proposed. (C) 2017 Elsevier Ltd. All rights reserved.

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