Ag-Ag2O/TiO2-g-C3N4纳米复合材料的制备及可见光催化性能

胡金娟; 马春雨; 王佳琳; 王宁; 秦福文; 张庆瑜

doi:10.13801/j.cnki.fhclxb.20191217.001

Ag-Ag₂O/TiO₂-g-C₃N₄纳米复合材料的制备及可见光催化性能

doi: 10.13801/j.cnki.fhclxb.20191217.001

大连理工大学　物理学院三束材料改性教育部重点实验室，大连 116024

基金项目: 中央高校基本科研业务费专项资金（DUT19LAB14）

详细信息

通讯作者:
马春雨，博士，副教授，研究方向为半导体复合光催化材料　E-mail：chunyuma@dlut.edu.cn

中图分类号: O643+36；TQ340.64
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-18
- 录用日期: 2019-12-06
- 网络出版日期: 2019-12-18
- 刊出日期: 2020-06-15

Preparation and photocatalytic properties of Ag-Ag₂O/TiO₂-g-C₃N₄ nanocomposites

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 近年来，半导体光催化技术作为一项快速发展的新型环保技术，在降解水体中污染物和可再生清洁能源的生产领域有很大的应用前景。本文以所制备出的20 wt%类石墨烯碳氮化合物(g-C₃N₄)/TiO₂为基质，利用水热法中纳米Ag颗粒部分氧化行为成功合成了Ag修饰异质结型Ag-Ag₂O/TiO₂-g-C₃N₄复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)、光致荧光光谱(PL)、瞬态光电流响应等分析测试手段对Ag-Ag₂O/TiO₂-g-C₃N₄复合材料的晶体结构、形貌、光学性质等进行表征和分析。以亚甲基蓝溶液为目标降解物，研究了Ag-Ag₂O/TiO₂-g-C₃N₄复合材料的可见光催化性能。结果表明：在纳米Ag颗粒修饰的Ag-Ag₂O/TiO₂-g-C₃N₄复合材料中，Ag部分氧化成Ag₂O；与g-C₃N₄的协同作用使Ag-Ag₂O/TiO₂-g-C₃N₄复合催化剂具有良好的可见光催化活性；可见光照射4 h后，Ag-Ag₂O/TiO₂-g-C₃N₄复合催化剂对亚甲基蓝的降解率接近50%。
- g-C₃N₄/TiO₂ /
- Ag₂O /
- 贵金属 /
- 异质结 /
- 可见光催化
Abstract: In recent years, semiconductor photocatalysis technology as a fast-developing environmental technology, has great application prospects in degradation of pollutants in water and production of renewable clean energy. In this paper, Ag-modified Ag-Ag₂O/TiO₂-graphitic carbon nitride (g-C₃N₄) heterojunction composites, which were based on the prepared 20 wt%g-C₃N₄/TiO₂ composites, were successfully synthesized by partially oxidizing nano-Ag particles during the hydrothermal process. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence spectroscopy (PL) and transient photocurrent analytical tests were used to characterize and analyze the crystal structure, morphology and optical properties of Ag-Ag₂O/TiO₂-g-C₃N₄ photocatalysts. The photocatalytic activity of the Ag-Ag₂O/TiO₂-g-C₃N₄ was also investigated through degradation of methylene blue (MB) under visible light irradiation. It is found that Ag is partially oxidized to Ag₂O, and their synergistic effects with g-C₃N₄ make the Ag-Ag₂O/TiO₂-g-C₃N₄ composites have good visible light photocatalytic activity. After 4 h of visible light irradiation, the degradation rate of MB by the Ag-Ag₂O/TiO₂-g-C₃N₄photocatalyst is close to 50%.
- g-C₃N₄/TiO₂ /
- Ag₂O /
- noble metal /
- heterojunction /
- visible light catalysis

HTML全文

图 1 TiO₂、类石墨烯碳氮化合物(g-C₃N₄)、g-C₃N₄/TiO₂复合材料和Ag-Ag₂O/TiO₂-g-C₃N₄复合材料的XRD图谱

Figure 1. XRD patterns of TiO₂, graphene-like carbon and nitrogen compounds(g-C₃N₄), g-C₃N₄/TiO₂ composite and Ag-Ag₂O/TiO₂-g-C₃N₄composite

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图 2 Ag-Ag₂O/TiO₂-g-C₃N₄复合材料的XPS图谱

Figure 2. XPS spectra of Ag-Ag₂O/TiO₂-g-C₃N₄ composite

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图 3 TiO₂、g-C₃N₄、g-C₃N₄/TiO₂ 复合材料和Ag-Ag₂O/TiO₂-g-C₃N₄复合材料的SEM图像

Figure 3. SEM images of TiO₂,g-C₃N₄, g-C₃N₄/TiO₂ composite and Ag-Ag₂O/TiO₂-g-C₃N₄composite

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图 4 TiO₂、g-C₃N₄、g-C₃N₄/TiO₂ 复合材料和Ag-Ag₂O/TiO₂-g-C₃N₄复合材料的紫外-可见漫反射光谱(UV-Vis DRS)、内插图为样品的带隙宽图(a)和光致荧光(PL)光谱(b)

Figure 4. UV-visible diffuse reflectance spectra(UV–vis DRS), the inset is the (αhv)^1/2 vs. photon energy plots(a) and photofluorescence(PL) spectra (b) of TiO₂,g-C₃N₄, g-C₃N₄/TiO₂ composite and Ag-Ag₂O/TiO₂-g-C₃N₄composite

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图 5 TiO₂、g-C₃N₄/TiO₂复合材料和 Ag-Ag₂O/TiO₂-g-C₃N₄复合材料对MB溶液的降解曲线(a)和降解动力学拟合曲线(b)及瞬态光电流响应曲线(c)

Figure 5. Photocatalytic degradation (a) and kinetic fitting curves of degradation (b) of MB of TiO₂, g-C₃N₄/TiO₂ composite and Ag-Ag₂O/TiO₂-g-C₃N₄composite and their corresponding photocurrent response curves under visible light irradiation (c)

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图 6 TiO₂(a)、g-C₃N₄(b)和Ag₂O(c)的带隙宽图及其在0.5 mol/L Na₂SO₄溶液中的M-S曲线图(内插图)及Ag-Ag₂O/TiO₂-g-C₃N₄复合材料催化剂可能光催化机制示意图(d)

Figure 6. (αhv)^1/2 vs. photon energy plots of TiO₂(a), g-C₃N₄(b) and Ag₂O(c), and the insets show the M-S plots for samples in 0.5 mol/L Na₂SO₄ aqueous solution and schematic of possible photocatalytic mechanisms of Ag-Ag₂O/TiO₂-g-C₃N₄ composite photocatalyst(d)

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