Tags

Type your tag names separated by a space and hit enter

Visible light-activated degradation of natural organic matter (NOM) using zinc-bismuth oxides-graphitic carbon nitride (ZBO-CN) photocatalyst: Mechanistic insights from EEM-PARAFAC.
Chemosphere. 2019 Jun; 224:597-606.C

Abstract

In this study, the complex degradation behavior of natural organic matter (NOM) was explored using photocatalytic oxidation systems with a novel catalyst based on a hybrid composite of zinc-bismuth oxides and g-C3N4 (ZBO-CN). The photooxidation system demonstrated the effective removal of NOM under low-intensity visible light irradiation, presenting removal rates of 53-74% and 65-88% on the basis of dissolved organic carbon (DOC) and the UV absorption coefficient (UV254), respectively, at 1.5 g/L of the catalyst. The NOM removal showed an increasing trend with a higher ZBO-CN dose. Comparative experiments with the hole and OH radical scavengers revealed that the direct oxidation occurring on the catalyst's surface might be the governing photocatalytic mechanism. Fluorescence excitation emission matrix-parallel factor analysis (EEM-PARAFAC) revealed the individual removal behavior of the different constituents in bulk NOM. Different tendencies towards preferential adsorption and subsequent oxidative removal were found among dissimilar fluorescent components within a bulk terrestrial NOM, following the order of terrestrial humic-like (C1) > humic-like (C2) > microbial humic-like (C3) components. The result suggests the dominant operation of π-π and/or hydrophobic interactions between the NOM and the catalyst. The discriminative removal behavior was more pronounced in visible light versus UV-activated systems, probably due to the incapability of visible light to excite è - h+ pairs of ZnO and the triplet state of NOM. The high photoactivity and structural stability of ZBO-CN under visible light implies its potential for an effective, low-cost and energy-saving treatment technology to selectively remove large sized humic-like substances from water.

Authors+Show Affiliations

Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.Department of Chemistry, Changwon National University, Changwon 51140, South Korea.Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.Department of Chemistry, Changwon National University, Changwon 51140, South Korea.Department of Environment and Energy, Sejong University, Seoul 05006, South Korea. Electronic address: jinhur@sejong.ac.kr.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30844591

Citation

Truong, Hai Bang, et al. "Visible Light-activated Degradation of Natural Organic Matter (NOM) Using Zinc-bismuth Oxides-graphitic Carbon Nitride (ZBO-CN) Photocatalyst: Mechanistic Insights From EEM-PARAFAC." Chemosphere, vol. 224, 2019, pp. 597-606.
Truong HB, Huy BT, Ly QV, et al. Visible light-activated degradation of natural organic matter (NOM) using zinc-bismuth oxides-graphitic carbon nitride (ZBO-CN) photocatalyst: Mechanistic insights from EEM-PARAFAC. Chemosphere. 2019;224:597-606.
Truong, H. B., Huy, B. T., Ly, Q. V., Lee, Y. I., & Hur, J. (2019). Visible light-activated degradation of natural organic matter (NOM) using zinc-bismuth oxides-graphitic carbon nitride (ZBO-CN) photocatalyst: Mechanistic insights from EEM-PARAFAC. Chemosphere, 224, 597-606. https://doi.org/10.1016/j.chemosphere.2019.02.171
Truong HB, et al. Visible Light-activated Degradation of Natural Organic Matter (NOM) Using Zinc-bismuth Oxides-graphitic Carbon Nitride (ZBO-CN) Photocatalyst: Mechanistic Insights From EEM-PARAFAC. Chemosphere. 2019;224:597-606. PubMed PMID: 30844591.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Visible light-activated degradation of natural organic matter (NOM) using zinc-bismuth oxides-graphitic carbon nitride (ZBO-CN) photocatalyst: Mechanistic insights from EEM-PARAFAC. AU - Truong,Hai Bang, AU - Huy,Bui The, AU - Ly,Quang Viet, AU - Lee,Yong-Ill, AU - Hur,Jin, Y1 - 2019/02/27/ PY - 2018/12/07/received PY - 2019/02/13/revised PY - 2019/02/23/accepted PY - 2019/3/8/pubmed PY - 2019/6/14/medline PY - 2019/3/8/entrez KW - EEM-PARAFAC KW - Graphitic carbon nitride KW - NOM KW - Photocatalytic degradation KW - Visible light SP - 597 EP - 606 JF - Chemosphere JO - Chemosphere VL - 224 N2 - In this study, the complex degradation behavior of natural organic matter (NOM) was explored using photocatalytic oxidation systems with a novel catalyst based on a hybrid composite of zinc-bismuth oxides and g-C3N4 (ZBO-CN). The photooxidation system demonstrated the effective removal of NOM under low-intensity visible light irradiation, presenting removal rates of 53-74% and 65-88% on the basis of dissolved organic carbon (DOC) and the UV absorption coefficient (UV254), respectively, at 1.5 g/L of the catalyst. The NOM removal showed an increasing trend with a higher ZBO-CN dose. Comparative experiments with the hole and OH radical scavengers revealed that the direct oxidation occurring on the catalyst's surface might be the governing photocatalytic mechanism. Fluorescence excitation emission matrix-parallel factor analysis (EEM-PARAFAC) revealed the individual removal behavior of the different constituents in bulk NOM. Different tendencies towards preferential adsorption and subsequent oxidative removal were found among dissimilar fluorescent components within a bulk terrestrial NOM, following the order of terrestrial humic-like (C1) > humic-like (C2) > microbial humic-like (C3) components. The result suggests the dominant operation of π-π and/or hydrophobic interactions between the NOM and the catalyst. The discriminative removal behavior was more pronounced in visible light versus UV-activated systems, probably due to the incapability of visible light to excite è - h+ pairs of ZnO and the triplet state of NOM. The high photoactivity and structural stability of ZBO-CN under visible light implies its potential for an effective, low-cost and energy-saving treatment technology to selectively remove large sized humic-like substances from water. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/30844591/Visible_light_activated_degradation_of_natural_organic_matter__NOM__using_zinc_bismuth_oxides_graphitic_carbon_nitride__ZBO_CN__photocatalyst:_Mechanistic_insights_from_EEM_PARAFAC_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)30395-9 DB - PRIME DP - Unbound Medicine ER -