Preparation and photocatalytic properties of Ag2O/WO3-SiO2 aerogels

doi:10.19965/j.cnki.iwt.2022-0334

Abstract

Abstract:

In order to expand the visible light absorption range of WO₃-SiO₂ aerogel and improve its photocatalytic effect，WO₃-SiO₂ aerogel was fabricated by sol-gel method firstly，and then Ag₂O/WO₃-SiO₂ composite aerogel photocatalysts with different Ag₂O loadings were synthesized through impregnation route. The composites were characterized by scanning electron microscopy（SEM），X-ray diffraction analysis（XRD），X-ray photoelectron spectroscopy（XPS），ultraviolet-visible spectroscopy（UV-vis），and fluorescence spectrophotometer（PL）. The photocatalytic degradation of methylene blue（MB） by the composite samples were investigated under the light source of 464 nm wavelength. The characterization analyses showed that the loaded Ag₂O could interact with WO₃ in the WO₃-SiO₂ aerogel by electron transfer，and the Ag₂O/WO₃ heterojunction was formed. The heterojunction narrowed the band gap width of the catalyst，which was beneficial to the excitation of photogenerated electrons and holes，while suppressing the recombination of electron-hole pairs. Based on the results of the photocatalytic degradation of MB，the Ag₂O/WO₃ heterostructure formed by loading Ag₂O enhanced the visible light absorption ability and improved the photocatalytic performance. The MB degradation rate of 0.4% Ag₂O/WO₃-SiO₂ aerogel reached 94.91% within 2 h，which was 58.17% higher than that of unmodified WO₃-SiO₂ aerogel. According to the band structure analysis of the catalyst，the possible mechanism of MB degradation by Ag₂O/WO₃ aerogel was proposed as Ⅱ-scheme heterostructure.

Key words: tungsten oxide, photocatalysis, aerogel, silver oxide, methylene blue, heterostructure

摘要：

为扩大WO₃-SiO₂气凝胶的可见光吸收范围，改善其光催化效果，先以溶胶-凝胶法制备了WO₃-SiO₂气凝胶，再采用浸渍法制备了不同Ag₂O负载量的Ag₂O/WO₃-SiO₂复合气凝胶光催化剂。通过扫描电镜（SEM）、Ｘ射线衍射分析仪（XRD）、Ｘ射线光电子能谱仪（XPS）、紫外-可见光谱仪（UV-vis）、荧光分光光度计（PL）对样品进行了表征分析，并在464 nm波长光源下考察了样品光催化降解亚甲基蓝（MB）的性能。表征结果表明，负载的Ag₂O与WO₃-SiO₂气凝胶中的WO₃存在电子转移相互作用，形成了Ag₂O/WO₃异质结；Ag₂O/WO₃异质结使催化剂的带隙宽度变窄，有利于光生电子-空穴的激发，同时抑制了电子-空穴对的复合。结合光催化剂降解MB的效果，负载Ag₂O形成的Ag₂O/WO₃异质结增强了Ag₂O/WO₃-SiO₂气凝胶的可见光吸收能力，提高了其光催化性能。其中，Ag₂O负载量为0.4%（质量分数）的Ag₂O/WO₃-SiO₂气凝胶具有最佳的催化降解性能，2 h内对MB的降解率达到94.91%，较WO₃/SiO₂气凝胶提高了58.17%。根据催化剂的能带结构分析，推断了Ag₂O/WO₃异质结降解MB的可能机理为Ⅱ型异质结机理。

关键词: 氧化钨, 光催化, 气凝胶, 氧化银, 亚甲基蓝, 异质结

CLC Number:

X703

Baoning CHEN, Chunhua DING, Yanxiong FANG, Quanbing LIU. Preparation and photocatalytic properties of Ag₂O/WO₃-SiO₂ aerogels[J]. Industrial Water Treatment, 2023, 43(2): 136-141.

陈宝宁, 丁春华, 方岩雄, 刘全兵. Ag₂O/WO₃-SiO₂气凝胶的制备及光催化性能研究[J]. 工业水处理, 2023, 43(2): 136-141.

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URL: https://gyscl.magtechjournal.com/EN/10.19965/j.cnki.iwt.2022-0334

https://gyscl.magtechjournal.com/EN/Y2023/V43/I2/136

Figures/Tables 8

Fig. 1 XRD patterns of Ag₂O/WO₃-SiO₂ aerogels containing different mass fractions of Ag₂O

Fig. 2 SEM of Ag₂O/WO₃-SiO₂ aerogels and WO₃-SiO₂ aerogels

Fig. 3 XPS spectras of Ag₂O/WO₃-SiO₂ aerogels

Fig. 4 UV-vis spectras of Ag₂O/WO₃-SiO₂aerogels containing different mass fractions of Ag₂O

Fig. 5 UV-vis diffuse reflectance spectroscopy（a）and energy gap diagram（b）of Ag₂O，WO₃ and Ag₂O/WO₃-SiO₂ aerogels

Fig. 6 Fluorescence spectra of Ag₂O/WO₃-SiO₂ aerogels and WO₃-SiO₂ aerogels

Fig. 7 Degradation performance of different photocatalysts on MB

Fig. 8 Possible mechanism of photocatalytic degradation of MB by Ag₂O/WO₃-SiO₂ aerogels

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Preparation and photocatalytic properties of Ag₂O/WO₃-SiO₂ aerogels

Ag₂O/WO₃-SiO₂气凝胶的制备及光催化性能研究

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