Design of TiO2-mesoporous silica composite photocatalysts and their application to water purification under irradiation of UV and visible light

IF 2.8 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Research on Chemical Intermediates Pub Date : 2024-11-29 DOI:10.1007/s11164-024-05458-4

Takashi Kamegawa, Yoshitsugu Maitani

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Abstract

Design of TiO₂ photocatalyst and mesoporous silica composites were carried out for application to water purification. Two different types of precursors (titanium ammonium oxalate and ammonium hexafluorotitanate) for anchoring of TiO₂ on mesoporous silica were adopted for comparative studies to show the roles of chemical constituents in both precursors. In the utilization of ammonium hexafluorotitanate, hydrophobic nature on the surface of mesoporous silica as well as the high crystallinity and visible light absorption performance of TiO₂ were achieved by the co-existence of fluorine and nitrogen during the decomposition of precursors to TiO₂ at elevated temperature. Based on these fascinating functions of composite photocatalyst, good photocatalytic activity was realized in the degradation of phenol in water under UV light (λ > 290 nm) irradiation. This composite photocatalyst also exhibited photocatalytic activity even under visible light (λ > 420 nm) irradiation.

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二氧化钛-介孔二氧化硅复合光催化剂的设计及其在紫外和可见光下的水净化应用

设计了用于水净化的TiO2光催化剂和介孔二氧化硅复合材料。采用草酸钛铵和六氟钛酸钛铵两种不同类型的前驱体（用于在介孔二氧化硅上锚定TiO2）进行对比研究，以显示两种前驱体中化学成分的作用。在利用六氟钛酸铵的过程中，由于前驱体在高温下分解为TiO2时氟氮共存，使得介孔二氧化硅表面具有疏水性，TiO2的高结晶度和可见光吸收性能得以实现。基于复合光催化剂的这些令人着迷的功能，在紫外（λ > 290 nm）照射下，复合光催化剂对水中苯酚的降解实现了良好的光催化活性。该复合光催化剂在可见光（λ > 420 nm）照射下也表现出光催化活性。

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来源期刊

Research on Chemical Intermediates 化学-化学综合

CiteScore

5.70

自引率

18.20%

发文量

229

审稿时长

2.6 months

期刊介绍： Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry. The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.