介孔氧化硅<strong>/</strong>氧化铈核壳双相复合颗粒的制备及其光催化降解活性

doi:10.11901/1005.3093.2020.326

材料研究学报

2021, Vol. 35

Issue (5): 364-370 DOI: 10.11901/1005.3093.2020.326

研究论文

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介孔氧化硅/氧化铈核壳双相复合颗粒的制备及其光催化降解活性

穆兆宇, 蔡文杰, 陈悦, 潘洁, 陈杨(

)

常州大学材料科学与工程学院常州 213164

Preparation and Photocatalytic Activity of Meso-silica/ceria Binary Composites with a Core/shell Structure

MU Zhaoyu, CAI Wenjie, CHEN Yue, PAN Jie, CHEN Yang(

)

School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China

引用本文:

穆兆宇, 蔡文杰, 陈悦, 潘洁, 陈杨. 介孔氧化硅/氧化铈核壳双相复合颗粒的制备及其光催化降解活性[J]. 材料研究学报, 2021, 35(5): 364-370.
Zhaoyu MU, Wenjie CAI, Yue CHEN, Jie PAN, Yang CHEN. Preparation and Photocatalytic Activity of Meso-silica/ceria Binary Composites with a Core/shell Structure[J]. Chinese Journal of Materials Research, 2021, 35(5): 364-370.

全文: PDF(9687 KB) HTML

摘要:

将CeO₂纳米粒子负载在介孔氧化硅(W-mSiO₂)支撑体上，制备了核壳结构的W-mSiO₂/CeO₂双相光催化复合颗粒。用X射线衍射、扫描电镜、透射电镜、氮气吸脱附、STEM-EDX mapping、Raman光谱、荧光光谱、紫外-可见漫反射光谱等手段分析样品的结构和性质，考察了复合光催化材料对亚甲基蓝(MB)的光催化降解反应活性。结果表明，复合颗粒中介孔氧化硅内核的尺寸为180~200 nm、比表面积高达1627 m²/g，包覆层(厚度约20 nm)由大量尺寸为数纳米的氧化铈粒子组成。介孔内核对MB有较强的吸附能力，使之富集在CeO₂活性粒子周围，从而提高了复合颗粒对MB的光催化降解效果。对壳层CeO₂纳米粒子进行Er³⁺掺杂改性并在非氧化性气氛(氮气)中保护煅烧，有助于进一步提高复合颗粒对MB的光催化降解活性。

关键词 ：复合材料, 氧化铈, 介孔氧化硅, 核壳结构, 光催化, 亚甲基蓝

Abstract：

In order to improve the photocatalytic activity and efficiency of ceria materials, the binary composite photocatalyst with a core/shell structure was fabricated by grafting CeO₂ nanoparticles on the surfaces of worm-like mesoporous silica supports. The prepared composite was characterized by means ofXRD, SEM, TEM, STEM-EDX mapping, UV-Vis, Raman, PL, N₂ adsorption-desorption measurements. The photodegradation towards methylene blue catalyzed by composite particles was tracked under UV irradiation. The results show that the particle size of mesoporous silica with a specific area up to 1627 m²/g is in the range of 180~200 nm, which was covered with an uniform layer of ca. 20 nm in thickness composed of a large number of nanometer ceria particles. The mesoporous cores exhibited a strong adsorption capacity for MB and therefore enriched MB around CeO₂ active nanoparticles, resulting in enhanced photodegradation activity for MB. Furthermore, it is worth noting that CeO₂ nanoparticles in the shell were doped with Er³⁺ and then calcinated in nitrogen atmosphere, can further enhance the photodegradation reaction activity of the binary composite photocatalyst.

Key words： composite ceria mesoporous silica core/shell structure photocatalysis methylene blue

收稿日期: 2020-08-05

ZTFLH:

TB332

基金资助:国家自然科学基金(51575058)

作者简介: 穆兆宇，男，1996年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.326 或 https://www.cjmr.org/CN/Y2021/V35/I5/364

图1 W-mSiO2样品的SEM和TEM照片

图2 W-mSiO2样品的氮气吸/脱附等温线和 XRD图谱

图3 复合颗粒样品的XRD、Raman图谱和氮气吸/脱附等温线

图4 复合颗粒样品的SEM和TEM照片

图5 单个复合颗粒S2的STEM-EDX元素分布

图6 复合颗粒的紫外吸收光谱、Kubelka-Munk函数以及荧光光谱图

图7 样品对MB的光催化降解率和光催化机理

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