Ti3+/C/N-TiO2@NGQDs纳米复合光催化剂的制备及其可见光催化性能研究

doi:10.11896/cldb.23090142

材料导报

2024, Vol. 38

Issue (23): 23090142-6 https://doi.org/10.11896/cldb.23090142

无机非金属及其复合材料

Ti³⁺/C/N-TiO₂@NGQDs纳米复合光催化剂的制备及其可见光催化性能研究

唐新德^*, 刘水林, 伍素云, 刘宁, 张春燕, 龚升高

湖南工学院化学与环境工程学院,湖南衡阳 421002

Preparation of Ti³⁺/C/N-TiO₂@NGQDs Nanocomposite Photocatalyst and Its Visible Light Catalytic Performance

TANG Xinde^*, LIU Shuilin, WU Suyun, LIU Ning, ZHANG Chunyan, GONG Shenggao

School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China

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摘要采用两步水热法制备了Ti³⁺、C和N共掺杂TiO₂@氮掺杂石墨烯量子点(Ti³⁺/C/N-TiO₂@NGQDs)纳米复合光催化剂,通过X射线衍射、透射电子显微镜、X射线光电子能谱和紫外可见漫反射光谱对其进行了详细表征,且通过降解甲基橙溶液研究了其可见光催化性能。结果表明,Ti³⁺、C和N成功地共掺杂了TiO₂,纳米NGQDs附着在共掺杂的TiO₂上; Ti³⁺/C/N-TiO₂@NGQDs降解甲基橙的动力学一阶速率常数分别是纯TiO₂、C/N-TiO₂和C/N-TiO₂ @ NGQDs的25.7倍、4.7倍和1.7倍,提升的可见光催化性能归因于其具有更强的可见光吸收、更快的光生电荷传输和分离效率。超氧自由基和光生空穴是Ti³⁺/C/N-TiO₂@NGQDs可见光降解甲基橙过程中的主要活性物质。此外,Ti³⁺/C/N-TiO₂@NGQDs具有非常高的稳定性。这种TiO₂基的复合光催化剂可适用于实际废水处理过程。

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关键词: Ti³⁺、C和N共掺杂 TiO₂ 氮掺杂石墨烯量子点废水处理可见光

Abstract: Ti³⁺, C, and N co-doped TiO₂@ nitrogen doped graphene quantum dots (Ti³⁺/C/N-TiO₂@NGQDs) nanocomposite photocatalyst was prepared by a two-step hydrothermal method and characterized in detail by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectroscopy, and its visible photocatalytic performance was studied by degrading methyl orange solution. The results showed that TiO₂ was successfully co-doped with Ti³⁺, C, and N, and nano NGQDs adhered to the co-doped TiO₂. The first-order kinetic rate constant for degradation of methyl orange by Ti³⁺/C/N-TiO₂@NGQDs was 25.7 times, 4.7 times, and 1.7 times that of pure TiO₂, C/N-TiO₂, and C/N-TiO₂@NGQDs, respectively. The enhanced visible light catalytic performance was attributed to its stronger visible light absorption and faster photoinduced charge transfer and separation efficiency. Superoxide radicals and photogenerated holes were key active substances during methyl orange degradation by Ti³⁺/C/N-TiO₂@NGQDs composite photocatalysts. In addition, Ti³⁺/C/N-TiO₂@NGQDs had very high stability. This TiO₂-based composite photocatalyst will have practical applications for wastewater treatment.

Key words: Ti³⁺,N,and B co-doped TiO₂ NGQDs wastewater treatment visible light

出版日期: 2024-12-10 发布日期: 2024-12-10

ZTFLH:

O643

基金资助: 湖南省自然科学基金(2021JJ50084; 2023JJ50113);湖南省教育厅重点项目(19A119; 22A0631)

通讯作者: * 唐新德,湖南工学院化学与环境工程学院教授。1998年中南林业科技大学工业学院化工工艺专业本科毕业,2010年中南大学化学化工学院化学工艺专业博士毕业。团队主要研究方向包括:光催化与纳米功能材料的设计及制备、有毒废水处理及利用。主持完成省自然科学基金项目3项,参加完成国家自然科学基金项目 3 项,发表学术论文30余篇。txd738011@126.com

引用本文:

唐新德, 刘水林, 伍素云, 刘宁, 张春燕, 龚升高. Ti³⁺/C/N-TiO₂@NGQDs纳米复合光催化剂的制备及其可见光催化性能研究[J]. 材料导报, 2024, 38(23): 23090142-6.
TANG Xinde, LIU Shuilin, WU Suyun, LIU Ning, ZHANG Chunyan, GONG Shenggao. Preparation of Ti³⁺/C/N-TiO₂@NGQDs Nanocomposite Photocatalyst and Its Visible Light Catalytic Performance. Materials Reports, 2024, 38(23): 23090142-6.

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http://www.mater-rep.com/CN/10.11896/cldb.23090142 或 http://www.mater-rep.com/CN/Y2024/V38/I23/23090142

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