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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Green synthesis of Ag/TiO(2)composite coated porous vanadophosphates with enhanced visible-light photo-degradation and catalytic reduction performance for removing organic dyes
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Green synthesis of Ag/TiO(2)composite coated porous vanadophosphates with enhanced visible-light photo-degradation and catalytic reduction performance for removing organic dyes

机译：Ag / TiO（2）复合涂层多孔钒磷酸的绿色合成，具有增强的可见光光降解和催化还原性能，用于去除有机染料

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As environmental pollution and energy shortages have become global concerns, the construction of highly efficient catalysts using facile and green methods remains a long-term goal. In the present study, we proposed a facile catalyst preparation method in which Ag/TiO(2)composites were coated on the surface of the porous pure inorganic crystalline vanadium phosphates (VPO) by a one-step strategy. More importantly, thein situreduction of Ag nanoparticles was achieved at room temperature without severe conditions or hydrogen atmosphere in which the porous VPO was employed as the reductant. The prepared Ag/VPO@TiO(2)composites act as a class of efficient bifunctional catalysts for visible light photodegradation of MB molecules and catalytic reduction ofp-nitrophenol (4-NP). Among these samples, the 6.82%Ag/VPO@TiO(2)composite exhibited a superior photocatalytic activity in the degradation of MB and an ultrafast reduction rate for 4-NP of about 0.1 mM/40 s. The photocatalytic mechanistic studies revealed that the encapsulated VPO with a narrow band gap not only efficiently enhances the photosensitivity of the TiO(2)but also largely facilitates the photogenerated charge separation. The subsequent deposition of Ag NPs is able to further promote electron transfer ability, which leads to the higher photocatalytic activity. Moreover, the contact of Ag NPs with the surface of semiconductor TiO(2)can result in an electron-enhanced area in their interface that could effectively facilitate the uptake of electrons by the 4-NP molecules and then improve the reduction activity.
机译：随着环境污染和能源短缺已成为全球担忧，使用轻型和绿色方法的高效催化剂的构建仍然是长期目标。在本研究中，我们提出了一种容易催化剂制备方法，其中通过单步策略将Ag / TiO（2）复合材料涂覆在多孔纯无机结晶钒磷酸盐（VPO）的表面上。更重要的是，在室温下达到Ag纳米颗粒的TheIn位于室温，而没有严重的条件或氢气氛，其中采用多孔VPO作为还原剂。制备的Ag / VPO @ TiO（2）复合材料作为一类有效的双官能催化剂，用于可见光光降解MB分子和催化还原的P-NITOLOPHOL（4-NP）。在这些样品中，6.82%AG/VPO@TiO（2）复合材料在Mb的降解中表现出优异的光催化活性，并超快降低率为4-np约0.1mm / 40 s。光催化机械研究表明，具有窄带隙的包封VPO不仅有效增强TiO（2）的光敏性，而且很大程度上促进了光催化的电荷分离。随后的Ag NPS沉积能够进一步促进电子转移能力，这导致光催化活性较高。此外，与半导体TiO（2）表面的Ag NP的接触可以导致其界面中的电子增强区域，其可以有效地促进通过4-NP分子的吸收，然后改善还原活性。

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