Fabrication of AgI-TiO2 loaded on carbon nanofibers and its excellent recyclable and renewable performance in visible-light catalysis
Fabrication of AgI-TiO2 loaded on carbon nanofibers and its excellent recyclable and renewable performance in visible-light catalysis
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碳纳米纤维负载AgI-TiO2的制备及其在可见光催化中优异的可回收和可再生性能
DOI：
10.1016/j.molcata.2016.04.005
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发表时间：
2016-08
期刊：
影响因子：
--
通讯作者：
Li, Chunping
中科院分区：
文献类型：
--
作者：
Bai, Jie;Liang, Haiou;Ma, Tengfei;Li, Chunping
采用原位还原、静电纺丝、溶剂热合成和气固氧化相结合的方法合成了新型可见光驱动AgI-TiO2/CNFs杂化材料。采用场发射扫描电镜（FE-SEM）、透射电镜（TEM）、x射线衍射（XRD）、x射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）对制备的AgI-TiO2/CNFs的形貌和化学成分进行了表征。表征结果表明，AgI与tio2和CNFs都有密切的联系。不同催化剂的光催化活性表明，AgI是主要的光活性成分，而AgI-TiO2/CNFs的光催化活性增强是由于AgI-TiO2与CNFs之间的协同作用，包括CNFs良好的吸附能力和导电性，以及AgI、TiO2和CNFs之间的密切联系。所制备的催化剂对甲基橙、酸性红18、荧光钠和苯酚具有普遍的降解活性。回收试验表明，AgI- tio2 /CNFs具有一定的光化学稳定性和可再生性能，而MO降解效率的下降是由于AgI的光分解。此外，所制备的杂化材料由于其一维结构特性，易于从液相中分离和回收。此外，自由基捕获实验表明，h+和自由基dotO2−是MO光催化氧化的主要活性物质，并提出了AgI-TiO2/CNFs可能的双阶段光催化机制。
Novel visible-light-driven AgI-TiO2/CNFs hybrid materials were synthesized by a combination of in-situ reduction, electrospinning, solvothermal synthesis, and gas/solid oxidation method. The morphology and chemical components of the as-prepared AgI-TiO2/CNFs were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectra (FTIR). The characterization results indicated that AgI had an intimate connection with both TiO2and CNFs. The photocatalytic activity of the different catalysts showed that AgI was the dominant photoactive component, while the enhanced photocatalytic activity of AgI-TiO2/CNFs was attributed to the synergic effect between AgI-TiO2and CNFs, which included the good adsorption ability and electrical conductivity of CNFs as well as the intimate connection among AgI, TiO2, and CNFs. The as-prepared catalysts displayed an universal degradation activity towards methyl orange, acid red 18, sodium fluorescence, and phenol. The recycling tests indicated AgI-TiO2/CNFs had a certain photochemical stability and renewable performance, while the decreased degradation efficiency of MO was attributed to the photodecomposition of AgI. Besides, the as-prepared hybrid materials could be easily separated and reclaimed from the liquid phase due to their 1D structural properties. Moreover, the radical-trapping experiments suggested that h+and radical dotO2−were the major active species in the photocatalytic oxidation of MO and a possible two-satges photocatalytic mechanism of AgI-TiO2/CNFs was also proposed.
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