Enhanced photocatalytic hydrogen evolution over graphitic carbon nitride modified with Ti-activated mesoporous silica

Shaohua Shen; Daming Zhao; Jie Chen; Liejin Guo; Samuel S. Mao

doi:10.1016/j.apcata.2015.11.004

Enhanced photocatalytic hydrogen evolution over graphitic carbon nitride modified with Ti-activated mesoporous silica

Shaohua Shen, Daming Zhao, Jie Chen, Liejin Guo, Samuel S. Mao

Mechanical & Nuclear Engineering

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

In this study, it was demonstrated that the visible light photocatalytic hydrogen evolution performance of g-C₃N₄ could be enhanced when g-C₃N₄ was loaded onto the MCM-41 mesoporous silica, and the photocatalytic activity of obtained MCM-41/g-C₃N₄ was 1.2 times as high as that of pure g-C₃N₄. This is mainly because the high dispersion of g-C₃N₄ on MCM-41 leads to the improved separation efficiency of electrons and holes photoexcited in g-C₃N₄. By introducing Ti into the MCM-41 framework structure to create [Ti⁴⁺-O^2-] active centers, the visible light driven photocatalytic activity of the obtained Ti-MCM-41/g-C₃N₄ was further increased, with hydrogen production rate reaching 80.76 μmol h^-1 g^-1, which was 1.6 times as high as that of pure g-C₃N₄. In the Ti-MCM-41/g-C₃N₄ composite photocatalysts, the photo-generated electrons in the conduction band of g-C₃N₄ can be easily transferred to the [Ti⁴⁺-O^2-] active centers in Ti-MCM-41 framework, hence, the separation efficiency of the photo-generated charge carriers was further improved, achieving higher photocatalytic activity of Ti-MCM-41/g-C₃N₄ than MCM-41/g-C₃N₄ as well as pure g-C₃N₄.

Original language	British English
Pages (from-to)	111-117
Number of pages	7
Journal	Applied Catalysis A: General
Volume	521
DOIs	https://doi.org/10.1016/j.apcata.2015.11.004
State	Published - 5 Jul 2016

Keywords

Active centers
g-CN
Photocatalytic hydrogen production
Ti-MCM-41

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apcata.2015.11.004

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@article{0698660e97a94c1292e51c2e1873ed25,

title = "Enhanced photocatalytic hydrogen evolution over graphitic carbon nitride modified with Ti-activated mesoporous silica",

abstract = "In this study, it was demonstrated that the visible light photocatalytic hydrogen evolution performance of g-C3N4 could be enhanced when g-C3N4 was loaded onto the MCM-41 mesoporous silica, and the photocatalytic activity of obtained MCM-41/g-C3N4 was 1.2 times as high as that of pure g-C3N4. This is mainly because the high dispersion of g-C3N4 on MCM-41 leads to the improved separation efficiency of electrons and holes photoexcited in g-C3N4. By introducing Ti into the MCM-41 framework structure to create [Ti4+-O2-] active centers, the visible light driven photocatalytic activity of the obtained Ti-MCM-41/g-C3N4 was further increased, with hydrogen production rate reaching 80.76 μmol h-1 g-1, which was 1.6 times as high as that of pure g-C3N4. In the Ti-MCM-41/g-C3N4 composite photocatalysts, the photo-generated electrons in the conduction band of g-C3N4 can be easily transferred to the [Ti4+-O2-] active centers in Ti-MCM-41 framework, hence, the separation efficiency of the photo-generated charge carriers was further improved, achieving higher photocatalytic activity of Ti-MCM-41/g-C3N4 than MCM-41/g-C3N4 as well as pure g-C3N4.",

keywords = "Active centers, g-CN, Photocatalytic hydrogen production, Ti-MCM-41",

author = "Shaohua Shen and Daming Zhao and Jie Chen and Liejin Guo and Mao, {Samuel S.}",

note = "Funding Information: The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 51323011, 51236007), the Program for New Century Excellent Talents in University (No. NCET-13-0455), the Natural Science Foundation of Shaanxi Province (No. 2014KW07-02), the Natural Science Foundation of Jiangsu Province (No. BK20141212) and the Nano Research Program of Suzhou City (Nos. ZXG201442, ZXG2013003). S. Shen was supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China (No. 201335) and the “Fundamental Research Funds for the Central Universities.” Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2016",

month = jul,

day = "5",

doi = "10.1016/j.apcata.2015.11.004",

language = "British English",

volume = "521",

pages = "111--117",

journal = "Applied Catalysis A: General",

issn = "0926-860X",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Enhanced photocatalytic hydrogen evolution over graphitic carbon nitride modified with Ti-activated mesoporous silica

AU - Shen, Shaohua

AU - Zhao, Daming

AU - Chen, Jie

AU - Guo, Liejin

AU - Mao, Samuel S.

N1 - Funding Information: The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 51323011, 51236007), the Program for New Century Excellent Talents in University (No. NCET-13-0455), the Natural Science Foundation of Shaanxi Province (No. 2014KW07-02), the Natural Science Foundation of Jiangsu Province (No. BK20141212) and the Nano Research Program of Suzhou City (Nos. ZXG201442, ZXG2013003). S. Shen was supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China (No. 201335) and the “Fundamental Research Funds for the Central Universities.” Publisher Copyright: © 2015 Elsevier B.V.

PY - 2016/7/5

Y1 - 2016/7/5

N2 - In this study, it was demonstrated that the visible light photocatalytic hydrogen evolution performance of g-C3N4 could be enhanced when g-C3N4 was loaded onto the MCM-41 mesoporous silica, and the photocatalytic activity of obtained MCM-41/g-C3N4 was 1.2 times as high as that of pure g-C3N4. This is mainly because the high dispersion of g-C3N4 on MCM-41 leads to the improved separation efficiency of electrons and holes photoexcited in g-C3N4. By introducing Ti into the MCM-41 framework structure to create [Ti4+-O2-] active centers, the visible light driven photocatalytic activity of the obtained Ti-MCM-41/g-C3N4 was further increased, with hydrogen production rate reaching 80.76 μmol h-1 g-1, which was 1.6 times as high as that of pure g-C3N4. In the Ti-MCM-41/g-C3N4 composite photocatalysts, the photo-generated electrons in the conduction band of g-C3N4 can be easily transferred to the [Ti4+-O2-] active centers in Ti-MCM-41 framework, hence, the separation efficiency of the photo-generated charge carriers was further improved, achieving higher photocatalytic activity of Ti-MCM-41/g-C3N4 than MCM-41/g-C3N4 as well as pure g-C3N4.

AB - In this study, it was demonstrated that the visible light photocatalytic hydrogen evolution performance of g-C3N4 could be enhanced when g-C3N4 was loaded onto the MCM-41 mesoporous silica, and the photocatalytic activity of obtained MCM-41/g-C3N4 was 1.2 times as high as that of pure g-C3N4. This is mainly because the high dispersion of g-C3N4 on MCM-41 leads to the improved separation efficiency of electrons and holes photoexcited in g-C3N4. By introducing Ti into the MCM-41 framework structure to create [Ti4+-O2-] active centers, the visible light driven photocatalytic activity of the obtained Ti-MCM-41/g-C3N4 was further increased, with hydrogen production rate reaching 80.76 μmol h-1 g-1, which was 1.6 times as high as that of pure g-C3N4. In the Ti-MCM-41/g-C3N4 composite photocatalysts, the photo-generated electrons in the conduction band of g-C3N4 can be easily transferred to the [Ti4+-O2-] active centers in Ti-MCM-41 framework, hence, the separation efficiency of the photo-generated charge carriers was further improved, achieving higher photocatalytic activity of Ti-MCM-41/g-C3N4 than MCM-41/g-C3N4 as well as pure g-C3N4.

KW - Active centers

KW - g-CN

KW - Photocatalytic hydrogen production

KW - Ti-MCM-41

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U2 - 10.1016/j.apcata.2015.11.004

DO - 10.1016/j.apcata.2015.11.004

M3 - Article

AN - SCOPUS:84964978063

SN - 0926-860X

VL - 521

SP - 111

EP - 117

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

ER -

Enhanced photocatalytic hydrogen evolution over graphitic carbon nitride modified with Ti-activated mesoporous silica

Abstract

Keywords

UN SDGs

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