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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 Name | Affiliation | Postcode | | 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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