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Photocatalytic degradation of DOM in urban stormwater runoff with TiO2 nanoparticles under UV light irradiation: EEM-PARAFAC analysis and influence of co-existing inorganic ions.
Environ Pollut. 2018 Dec; 243(Pt A):177-188.EP

Abstract

In situ photocatalytic degradation of dissolved organic matter (DOM) of stormwater runoff can efficiently improve the aquatic environment quality and relieve the wastewater treatment pressure. In this work, photocatalytic degradation of DOM in TiO2 (AEROXIDE® P-25) photocatalyst under illumination of ultraviolet (UV) light was carried out, considering the influence of various factors like TiO2 dosage, solution pH along with the existence of co-existing ions (Cu2+ and H2PO4-). Generally, the variations of dissolved organic carbon (DOC), UV-based parameters and peak intensities of fluorescent constituents with UV exposure time fitted perfectly with the pseudo-first-order kinetics model. The total DOM removal efficiency was affected by diversiform factors like adsorption capacity of TiO2, UV light utilization efficiency, reactive free radicals produced and the influence of co-existing ions. The results of fluorescence excitation-emission matrix (EEM) coupled with parallel factor analysis (PARAFAC) modeling demonstrated that all the photodegradation rates for three identified fluorescent constituents (protein-like constituent 1 and 3, humic-like constituent 2) were faster than UV-absorbing chromophores, suggesting the DOM molecules in urban stormwater runoff contained much more π*-π transition structures. In addition, H2PO4- ions affected the photodegradation of DOM by capturing positive holes (h+) and hydroxyl radical (·OH), whereas Cu2+ ions were inclined to generate Cu-protein complexes that were more difficult to degrade than the other Cu-DOM complexes. This study supplied novel insights into the photocatalytic degradation mechanism of individual organic constituent in urban stormwater runoff and explored the influences of co-existing contaminants on their adsorption-photocatalysis processes.

Authors+Show Affiliations

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China; Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. Electronic address: zhwang@mail.buct.edu.cn.Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China. Electronic address: wangchongchen@bucea.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30172987

Citation

Zhao, Chen, et al. "Photocatalytic Degradation of DOM in Urban Stormwater Runoff With TiO2 Nanoparticles Under UV Light Irradiation: EEM-PARAFAC Analysis and Influence of Co-existing Inorganic Ions." Environmental Pollution (Barking, Essex : 1987), vol. 243, no. Pt A, 2018, pp. 177-188.
Zhao C, Wang Z, Wang C, et al. Photocatalytic degradation of DOM in urban stormwater runoff with TiO2 nanoparticles under UV light irradiation: EEM-PARAFAC analysis and influence of co-existing inorganic ions. Environ Pollut. 2018;243(Pt A):177-188.
Zhao, C., Wang, Z., Wang, C., Li, X., & Wang, C. C. (2018). Photocatalytic degradation of DOM in urban stormwater runoff with TiO2 nanoparticles under UV light irradiation: EEM-PARAFAC analysis and influence of co-existing inorganic ions. Environmental Pollution (Barking, Essex : 1987), 243(Pt A), 177-188. https://doi.org/10.1016/j.envpol.2018.08.062
Zhao C, et al. Photocatalytic Degradation of DOM in Urban Stormwater Runoff With TiO2 Nanoparticles Under UV Light Irradiation: EEM-PARAFAC Analysis and Influence of Co-existing Inorganic Ions. Environ Pollut. 2018;243(Pt A):177-188. PubMed PMID: 30172987.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic degradation of DOM in urban stormwater runoff with TiO2 nanoparticles under UV light irradiation: EEM-PARAFAC analysis and influence of co-existing inorganic ions. AU - Zhao,Chen, AU - Wang,Zhihua, AU - Wang,Chaoyang, AU - Li,Xiang, AU - Wang,Chong-Chen, Y1 - 2018/08/27/ PY - 2018/06/10/received PY - 2018/08/14/revised PY - 2018/08/20/accepted PY - 2018/9/3/pubmed PY - 2018/12/12/medline PY - 2018/9/3/entrez KW - Dissolved organic matter KW - EEM-PARAFAC KW - Inorganic ions KW - Photocatalytic degradation KW - Stormwater runoff SP - 177 EP - 188 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ. Pollut. VL - 243 IS - Pt A N2 - In situ photocatalytic degradation of dissolved organic matter (DOM) of stormwater runoff can efficiently improve the aquatic environment quality and relieve the wastewater treatment pressure. In this work, photocatalytic degradation of DOM in TiO2 (AEROXIDE® P-25) photocatalyst under illumination of ultraviolet (UV) light was carried out, considering the influence of various factors like TiO2 dosage, solution pH along with the existence of co-existing ions (Cu2+ and H2PO4-). Generally, the variations of dissolved organic carbon (DOC), UV-based parameters and peak intensities of fluorescent constituents with UV exposure time fitted perfectly with the pseudo-first-order kinetics model. The total DOM removal efficiency was affected by diversiform factors like adsorption capacity of TiO2, UV light utilization efficiency, reactive free radicals produced and the influence of co-existing ions. The results of fluorescence excitation-emission matrix (EEM) coupled with parallel factor analysis (PARAFAC) modeling demonstrated that all the photodegradation rates for three identified fluorescent constituents (protein-like constituent 1 and 3, humic-like constituent 2) were faster than UV-absorbing chromophores, suggesting the DOM molecules in urban stormwater runoff contained much more π*-π transition structures. In addition, H2PO4- ions affected the photodegradation of DOM by capturing positive holes (h+) and hydroxyl radical (·OH), whereas Cu2+ ions were inclined to generate Cu-protein complexes that were more difficult to degrade than the other Cu-DOM complexes. This study supplied novel insights into the photocatalytic degradation mechanism of individual organic constituent in urban stormwater runoff and explored the influences of co-existing contaminants on their adsorption-photocatalysis processes. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/30172987/Photocatalytic_degradation_of_DOM_in_urban_stormwater_runoff_with_TiO2_nanoparticles_under_UV_light_irradiation:_EEM_PARAFAC_analysis_and_influence_of_co_existing_inorganic_ions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(18)32588-0 DB - PRIME DP - Unbound Medicine ER -