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| 木质纤维基碳量子点/介孔TiO2复合体系的构建及光催化性能的研究 |
| Preparation of Lignocellulose Based Carbon Quantum Dots/Mesoporous TiO2 Composite and Its Photocatalytic Performance |
| 收稿日期：2020-10-03 |
| DOI：10.11980/j.issn.0254-508X.2021.03.002 |
| 关键词: 介孔TiO2 碳量子点 玉米芯残渣 木素 光催化 |
| Key Words:mesoporous TiO2 carbon quantum dots corncob residues lignin photocatalysis |
| 基金项目: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）。 |
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| 摘要:本研究以氮掺杂酶解玉米芯残渣碳量子点（E-N-CQDs）和介孔TiO2进行复合，构建了介孔TiO2/E-N-CQDs复合光催化剂体系，对其进行了分析表征，并探讨了其对水相中亚甲基蓝（MB）的降解能力。结果表明，E-N-CQDs具有良好的荧光性能，且其表面羧基、氨基等发色基团和助色基团增强了其荧光特性；介孔TiO2具有较大的比表面积，孔径8~32 nm；与介孔TiO2相比，光照300 min时，介孔TiO2/E-N-CQDs对MB的降解率达到89%，提高了59%。由此可见，碳量子点的加入可显著提高介孔TiO2的光催化降解能力，提高了对可见光的利用率。 |
| 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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