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Preparation of Lignocellulose Based Carbon Quantum Dots/Mesoporous TiO2 Composite and Its Photocatalytic Performance
Received:October 03, 2020  
DOI：10.11980/j.issn.0254-508X.2021.03.002
Key Words:mesoporous TiO2  carbon quantum dots  corncob residues  lignin  photocatalysis
Fund Project:中国博士后基金面上项目（2019M651050）；天津市制浆造纸重点实验室项目（201802）；天津市大学生创新创业项目（201910057042，202010057006）。
Author NameAffiliationPostcode
YAN Yahan Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 300457
SANG Ranran Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 300457
LIU Wei Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457
Mudanjiang Hengfeng Paper Co.， Ltd.， Mudanjiang， Heilongjiang Province， 157013 		157013
NING Chenxi Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 300457
HOU Qingxi Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 300457
LI Jinsong Mudanjiang Hengfeng Paper Co.， Ltd.， Mudanjiang， Heilongjiang Province， 157013 157013
WANG Yu Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 300457
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Abstract:In this study， a composite photocatalyst system （mesoporous TiO2/E-N-CQDs） was constructed by using nitrogen-doped CQDs （E-N-CQDs） from enzymatically hydrolyzed corncob residues and mesoporous TiO2. The resultant mesoporous TiO2/E-N-CQDs was characterized and explored to use for the photocatalytic degradation of methylene blue （MB） solution. The results showed that E-N-CQDs exhibited good fluorescence properties， and the chromophoric and auxochromic groups such as carboxyl groups and amino groups on the surface of E-N-CQDs enhanced its fluorescence. The prepared mesoporous TiO2 had a large specific surface area with a pore size distribution in the range of 8~32 nm. The photocatalytic degradation ratio of MB solution using mesoporous TiO2/E-N-CQDs achieved 89% when irradiation time was 300 mins， increased by 59% compared with using mesoporous TiO2， suggesting that the addition of E-N-CQDs significantly enhanced the photocatalytic ability of mesoporous TiO2， improved the utilization efficiency of the visible light.
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