新材料与新技术

N制掺CNT/SiO2/TiO2复合光催化材料的制备及性能

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  • 沈阳化工大学应用化学学院,沈阳110142
苑廷玉(1995-),女,硕士研究生,主要从事无机非金属材料研究,E-mail:15204042290@163.com。

收稿日期: 2020-02-07

  修回日期: 2021-02-21

  网络出版日期: 2021-06-10

基金资助

辽宁省自然科学基金项目(20180550539)

Preparation and performance of N-doped CNT/SiO2/TiO2 composite photocatalytic material

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  • Shenyang University of Chemical Technology,Shenyang 110142

Received date: 2020-02-07

  Revised date: 2021-02-21

  Online published: 2021-06-10

摘要

采用溶胶-凝胶法,以正硅酸乙酯和钛酸四正丁酯为复合溶胶前驱体,利用二乙醇胺控制正硅酸乙酯和钛酸四正丁酯的缩聚反应速率,通过原位生长法制备了N掺杂的碳纳米管/二氧化硅/二氧化钛(CNT/TiO2/SiO2)复合材料。采用扫描电镜(SEM)、光电子能谱(XPS)、粉末X射线衍射(XRD)等手段表征复合材料的表面形貌及结构,通过亚甲基蓝的光催化降解实验表征样品的光催化性能。结果表明:N掺杂的CNT/TiO2/SiO2复合材料较光催化剂商业二氧化钛(P25)具有更好的紫外光催化性能。此外,由二乙醇胺引入的N元素掺杂到TiO2晶格中,由于N和O的2p轨道杂化,使复合材料的禁带宽度收窄,产生可见光活性,从而使N掺杂CNT/TiO2/SiO2复合材料具有良好的可见光光催化性能。

本文引用格式

苑廷玉, 盛永刚 . N制掺CNT/SiO2/TiO2复合光催化材料的制备及性能[J]. 化工新型材料, 2021 , 49(5) : 120 -123 . DOI: 10.19817/j.cnki.issn 1006-3536.2021.05.027

Abstract

Adopting sol-gel method,using ethyl orthosilicate and tetra-n-butyl titanate as precursors of composite sol,and using diethanolamine to control the polycondensation reaction of isopropyl titanate and ethyl orthosilicate,N-doped CNT/TiO2/SiO2 composites were prepared by in-situ growth method.Scanning electron microscope (SEM),photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD) were used to characterize the surface morphology and structure of the composite material,and characterized the photocatalytic performance of samples by photocatalytic degradation of methylene blue.The results shown that the N-doped CNT/TiO2/SiO2 had better UV photocatalytic performance than the photocatalyst P25.In addition,the N element introduced by diethanolamine was successfully doped into the TiO2 lattice.Due to the hybridization of the 2p orbitals of N and O,the band gap width of the material was narrowed and generated the visible light activity,thereby making N-doped CNT/TiO2/SiO2 composites had good visible light photocatalytic performance.

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