Effective elimination of As(iii) via simultaneous photocatalytic oxidation and adsorption by a bifunctional cake-like TiO2 derived from MIL-125(Ti)†,Catalysis Science & Technology

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Effective elimination of As(iii) via simultaneous photocatalytic oxidation and adsorption by a bifunctional cake-like TiO2 derived from MIL-125(Ti)†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-03-19 00:00:00 , DOI: 10.1039/c8cy00125a
Zhongmin Liu _{1,

2,

3,

4} , Yongchuan Wu _{1,

2,

3,

4} , Jitao Chen _{1,

2,

3,

4} , Yaru Li _{1,

2,

3,

4} , Jingyu Zhao _{1,

2,

3,

4} , Kaihua Gao _{1,

2,

3,

4} , Ping Na _{1,

2,

3,

4,

5}

Affiliation

A bifunctional cake-like TiO₂ was successfully synthesized via calcination of MIL-125(Ti) at a suitable temperature by a one-step method and was applied for As(III) removal by simultaneous photocatalytic oxidation and adsorption. The as-synthesized samples were characterized by XRD, TGA/DSC, SEM, TEM, N₂ adsorption–desorption isotherms, PL spectra, photocurrent, FTIR and XPS. The effects of calcination temperature on the specific surface areas of the samples, transformation of the TiO₂ crystal phase and properties of As(III) removal were investigated. The results showed that higher calcination temperature resulting in a lower specific surface area and more transformations of the TiO₂ crystal phase from anatase to rutile. The TiO₂ calcined at 380 °C (MIL-125(Ti)-380 °C) exhibited excellent properties for As(III) removal, including photocatalytic oxidation of As(III) and simultaneous adsorption of the generated As(V). In addition, MIL-125(Ti)-380 °C could be reused at least four times without significant reduction in the photocatalytic oxidation and adsorption performances. The excellent photocatalytic oxidation and adsorption abilities of MIL-125(Ti)-380 °C can be attributed to the synergistic effects of strong photogenerated electron–hole separation and high specific surface area. The bifunctional cake-like TiO₂ provides a wonderful strategy to remove As(III) completely from contaminated water using a single step.

中文翻译：

作为（的有效消除III）通过同时光催化氧化和吸附由双官能饼状的TiO ₂从MIL-125（Ti）的衍生†

通过一步法在适当温度下MIL-125（Ti）煅烧成功合成了双功能饼状TiO _2，并通过同时进行光催化氧化和吸附去除As（III）。合成后的样品通过XRD，TGA / DSC，SEM，TEM，N ₂吸附-解吸等温线，PL光谱，光电流，FTIR和XPS进行了表征。研究了煅烧温度对样品比表面积，TiO ₂晶相转变和As（Ⅲ）去除性能的影响。结果表明，较高的煅烧温度导致较低的比表面积和更多的TiO转变从锐钛矿到金红石的₂晶相。在380°C（MIL-125（Ti）-380°C）下煅烧的TiO₂表现出优异的As（ III）去除性能，包括光催化氧化As（ III）和同时吸附生成的As（ V）。此外，MIL-125（Ti）-380°C可以重复使用至少四次，而不会显着降低光催化氧化和吸附性能。MIL-125（Ti）-380°C具有出色的光催化氧化和吸附能力，这归因于强大的光生电子-空穴分离和高比表面积的协同效应。双功能饼状TiO₂提供了一种去除As（ III的绝妙策略），只需一步即可完全将其从受污染的水中清除。

更新日期：2018-03-19

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