Preparation and performance of Ag modified PVA/SrTiO3/TiO2 photocatalytic materials

doi:10.19965/j.cnki.iwt.2021-1010

Abstract

Abstract:

The recyclable polyvinyl alcohol/strontium titanate/titanium dioxide/silver（PVA/SrTiO₃/TiO₂/Ag） composite with high photocatalytic performance was successfully synthesized by sol-gel method and chemical precipitation method. The synthesized samples were characterized by XRD，SEM，TEM，EDX，XPS，UV-Vis DRS，fluorescence spectrophotometer and EPR. The structural characterization results showed that the PVA/SrTiO₃/TiO₂/Ag composite had a uniform，layered porous network structure. UV-Vis DRS showed that due to the doping of Ag atoms，the composite had strong light absorption in the ultraviolet and visible region and surface plasmon resonance effect. Fluorescence spectrophotometer test results confirmed that the composite material effectively inhibited the recombination of photogenerated electron-hole pairs. The samples were tested for photocatalytic activity，and the result showed that the PVA/SrTiO₃/TiO₂/Ag composite had excellent photocatalytic performance for the degradation of methylene blue（MB） under ultraviolet light. The photocatalytic performance was closely related to the initial MB concentration and pH. Repeated studies showed that the composite retained nearly 90% of the initial photocatalytic degradation performance after three cycles，exhibiting excellent stability and reusability.

Key words: photocatalyst, PVA/SrTiO₃/TiO₂/Ag, recyclability

摘要：

采用溶胶-凝胶法和化学沉淀法成功合成具有高光催化性能的可回收聚乙烯醇/钛酸锶/二氧化钛/银（PVA/SrTiO₃/TiO₂/Ag）复合材料。所合成样品通过XRD、SEM、TEM、EDX、XPS、UV-Vis DRS、荧光分光光度计和EPR进行表征。结构表征结果显示其具有均匀的、分层的多孔网络结构。UV-Vis DRS测试结果表明由于Ag原子的掺杂，复合材料在紫外-可见光区域具有强烈的光吸收能力，并且产生表面等离子共振效应。荧光分光光度计测试结果证实该复合材料有效地抑制了光生电子-空穴对的复合。对样品进行光催化活性测试，结果证明，在紫外光下PVA/SrTiO₃/TiO₂/Ag复合材料对亚甲基蓝（MB）的降解具有优异的光催化性能，且光催化性能与初始MB浓度和pH密切相关。重复性研究表明，该复合材料在3个循环后，仍保持初始光催化降解活性的近90％，展现出极好的稳定性和重复使用性。

关键词: 光催化, PVA/SrTiO₃/TiO₂/Ag, 可回收性

CLC Number:

X703
O643.36

Fuhua LIU. Preparation and performance of Ag modified PVA/SrTiO₃/TiO₂ photocatalytic materials[J]. Industrial Water Treatment, 2022, 42(7): 125-132.

刘富华. Ag改性PVA/SrTiO₃/TiO₂光催化材料的制备及性能[J]. 工业水处理, 2022, 42(7): 125-132.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-1010

https://www.iwt.cn/EN/Y2022/V42/I7/125

Figures/Tables 10

Fig. 1 XRD of SrTiO₃/TiO₂，SrTiO₃/TiO₂/Ag and PVA/SrTiO₃/TiO₂/Ag

Fig. 2 SEM of PVA（a），SrTiO₃/TiO₂/Ag（b） and PVA/SrTiO₃/TiO₂/Ag（c），and EDX spectroscopy of PVA/SrTiO₃/TiO₂/Ag（d）

Fig. 3 The XPS spectrum of PVA/SrTiO₃/TiO₂/Ag

Fig. 4 UV-Vis DRS and PL analysis

Fig. 5 Catalytic performance of different catalysts for MB degradation （a） and corresponding photocatalytic kinetics （b）

Fig. 6 Catalytic performance （a） and the corresponding photocatalytic kinetics （b） of PVA/SrTiO₃/TiO₂/Ag under different MB initial mass concentration

Fig. 7 Catalytic performance （a） and the corresponding photocatalytic kinetics （b） of PVA/SrTiO₃/TiO₂/Ag at different pH

Fig. 8 The reusability of PVA/SrTiO₃/TiO₂/Ag on MB photodegradation

Fig. 9 EPR spectrum of PVA/SrTiO₃/TiO₂/Ag composite

Fig. 10 Electron-hole transfer mechanism of PVA/SrTiO₃/TiO₂/Ag composite under ultraviolet light

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Preparation and performance of Ag modified PVA/SrTiO₃/TiO₂ photocatalytic materials

Ag改性PVA/SrTiO₃/TiO₂光催化材料的制备及性能

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