Bromate removal from water intended for human consumption by heterogeneous photocatalysis: Effect of major dissolved water constituents.

Autor: Morais DFS; Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade Do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal., Boaventura RAR; Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade Do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal., Moreira FC; Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade Do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal. Electronic address: francisca.moreira@fe.up.pt., Vilar VJP; Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade Do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal. Electronic address: vilar@fe.up.pt.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2021 Jan; Vol. 263, pp. 128111. Date of Electronic Publication: 2020 Sep 03.
DOI: 10.1016/j.chemosphere.2020.128111
Abstrakt: This study focuses on the influence of major dissolved constituents naturally found in waters intended for human consumption on bromate (BrO 3 - ) reduction by heterogeneous photocatalysis. The individual and combined effect of chloride (Cl - ), bicarbonate/carbonic acid (HCO 3 - /H 2 CO 3 ), nitrate (NO 3 - ), sulphate (SO 4 2- ) and humic acids (HAs) on BrO 3 - reduction was evaluated in synthetic waters (SWs). Additionally, freshwaters (FWs) from a drinking water treatment plant (DWTP) were tested and directly compared to SWs. Cl - was beneficial for contents in the range 0.47-1.4 mM, with negligible influence for lower and higher contents. NO 3 - had a null effect regardless of its content (0.024-0.81 mM). HCO 3 - /H 2 CO 3 (0.061/0.45 mM), SO 4 2- (0.12-2.6 mM) and HAs (0.11-1.0 mM C) had a negative effect in the tested contents. The BrO 3 - reduction rate was 2.8 times lower in SW with a mixture of water constituents compared to SW without constituents addition. This decline on BrO 3 - reduction rate corresponded to the sum of the individual species contribution and so there was no evidence of synergetic effects. By contrast, the use of FWs provided BrO 3 - reduction rates only slightly lower than that found for SW without constituents addition (∼1.2-fold), which can be attributed to: (i) the distinct characteristics of the organic matter of FWs (HAs, fulvic acids and humins with distinct molecular weights and functional groups) compared to that of SW (pure HAs), and/or (ii) the presence in FWs of other inorganics in addition to those here addressed. The heterogeneous TiO 2 photocatalysis proved to be a promising process for BrO 3 - reduction in DWTPs.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: