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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)。
作者单位邮编
严亚韩 天津科技大学天津市制浆造纸重点实验室天津300457 300457
桑然然 天津科技大学天津市制浆造纸重点实验室天津300457 300457
刘苇 天津科技大学天津市制浆造纸重点实验室天津300457
牡丹江恒丰纸业股份有限公司黑龙江牡丹江157013 
157013
宁晨汐 天津科技大学天津市制浆造纸重点实验室天津300457 300457
侯庆喜 天津科技大学天津市制浆造纸重点实验室天津300457 300457
李劲松 牡丹江恒丰纸业股份有限公司黑龙江牡丹江157013 157013
王玉 天津科技大学天津市制浆造纸重点实验室天津300457 300457
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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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