Photocatalytic degradation of organic pollutants coupled with simultaneous photocatalytic H2 evolution over graphene quantum dots/Mn-N-TiO2/g-C3N4 composite catalysts: Performance and mechanism

Nie, Yu-Chun; Yu, Fan; Wang, Lai-Chun; Xing, Qiu-Ju; Liu, Xia; Pei, Yong; Zou, Jian-Ping; Dai, Wei-Li; Li, Yan; Suib, Steven L.

doi:10.1016/j.apcatb.2018.01.033

Photocatalytic degradation of organic pollutants coupled with simultaneous photocatalytic H₂ evolution over graphene quantum dots/Mn-N-TiO₂/g-C₃N₄ composite catalysts: Performance and mechanism

Journal Article · Sun Jul 01 00:00:00 EDT 2018 · Applied Catalysis. B, Environmental

DOI:https://doi.org/10.1016/j.apcatb.2018.01.033· OSTI ID:1597843

Nie, Yu-Chun ^[1]; Yu, Fan ^[2]; Wang, Lai-Chun ^[2]; Xing, Qiu-Ju ^[2]; Liu, Xia ^[3]; Pei, Yong ^[3]; Zou, Jian-Ping ^[2]; Dai, Wei-Li ^[2]; Li, Yan ^[4]; Suib, Steven L. ^[5]

Nanchang Hangkong Univ., Nanchang (China). Key Lab. of Jiangxi Province for Persistent Pollutants Control and Resources Recycle; Univ of Connecticut
Nanchang Hangkong Univ., Nanchang (China). Key Lab. of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
Xiangtan Univ. (China). Key Lab. of Environmentally Friendly Chemistry and Applications of Ministry of Education
East China Univ. of Science and Technology, Shanghai (China). School of Chemistry & Molecular Engineering
Univ. of Connecticut, Storrs, CT (United States)

Graphene quantum dots/Mn-N-TiO₂/g-C₃N₄ (GQDs/TCN) composite photocatalysts have been designed, synthesized and characterized by XRD, SEM, TEM, Raman, BET, and XPS. The photodegradation of organic pollutants (p-nitrophenol, diethyl phthalate and ciprofloxacin, called as 4-NP, CIP and DEP, respectively) coupled with simultaneous photocatalytic production of hydrogen was successfully achieved using the GQDs/TCN catalysts. The 5%GQDs/TCN-0.4 sample shows the best photocatalytic hydrogen production and organic pollutant degradation rate under simulated solar irradiation in the simultaneous photocatalytic oxidation and reduction system. Furthermore, the photocatalytic H₂ evolution rates in the solution of 4-NP, CIP and DEP are all larger than that in pure water system over the 5%GQDs/TCN-0.4 catalyst. And the H₂ evolution rate in the solution of 4-NP is smaller than that in the solutions of CIP and DEP. Accordingly, the photodegradation rate of 4-NP is larger than that of CIP and DEP. The analyses of density functional theory and liquid chromatography mass spectrometry indicate that some photogenerated electrons were used in the photodegradation process of 4-NP but not in that of CIP and DEP. And it leads to the photocatalytic rate of H₂ evolution in the 4-NP solution smaller than that in the solution of CIP and DEP. For the first time, the present work illuminates the photocatalytic enhancement of the GQDs/TCN-0.4 catalyst and the mechanism of the effect of different organic pollutants on photocatalytic H₂ evolution.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FG02-86ER13622

OSTI ID:: 1597843

Alternate ID(s):: OSTI ID: 1537977

Journal Information:: Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Journal Issue: C Vol. 227; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
Degradation
Graphitic carbon nitride
Hydrogen evolution
Organic pollutants
Photocatalysis