Determination of the roles of FeIII in the interface between titanium dioxide and montmorillonite in FeIII-doped montmorillonite/titanium dioxide composites as photocatalysts
Determination of the roles of FeIII in the interface between titanium dioxide and montmorillonite in FeIII-doped montmorillonite/titanium dioxide composites as photocatalysts
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DOI：
10.1016/j.clay.2022.106577
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发表时间：
2022-09
影响因子：
5.6
通讯作者：
Li Zhang;Chitiphon Chuaicham;V. Balakumar;K. Sekar;B. Ohtani;K. Sasaki
中科院分区：
文献类型：
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作者：
Li Zhang;Chitiphon Chuaicham;V. Balakumar;K. Sekar;B. Ohtani;K. Sasaki
铁/公吨/ Fe ~（3+）掺杂在蒙脱石上的TiO_2（Mt.）在三种温度下合成了Fe Ⅲ阳离子掺杂的Fe-TiO_2。X射线荧光光谱（XRF）和X射线衍射（XRD）结果表明，与Fe III位置的影响相比，合成温度对TiO 2的生成有一定的影响。通过紫外漫反射光谱（DRS）、光致发光光谱（PL）、光电流和电化学阻抗谱（EIS）等表征手段，表明Fe/Mt./ TiO 2复合材料比Mt./ Fe-TiO 2复合材料电子陷阱的能量分辨分布（ERDT）图显示了Fe/Mt./ TiO 2和Mt./ Fe/Mt./TiO 2复合光催化剂的光催化性能与Fe/Mt./TiO 2复合光催化剂基本相同。TiO 2和Mt./ Fe-TiO 2。研究了Fe/Mt./ TiO_2比Mt./ Fe-TiO_2薄膜的光致发光、光电流和电化学阻抗谱的结果与DRS、PL、EIS的结果一致。一个异质结之间的山。和TiO 2在Fe/Mt./ TiO 2的存在解释了两种复合材料光催化性能和光催化性能的不一致性以及复合材料表面TiO 2颗粒光催化性能的一致性。为了提高Fe/Mt./ TiO 2，FeIII掺杂的Mt.可以与TiO 2价带上的空穴耦合，导致电子和空穴的有效分离以及减少和/或避免复合。
Fe/Mt./TiO2with FeIIIcation doped on montmorillonite (Mt) and, Mt./Fe-TiO2with FeIIIcation doped on TiO2were synthesized at three temperatures. Compared with the influence from the position of FeIII, the synthesis temperature had moderate interference on the TiO2formation as was implied by X-ray fluorescence (XRF) and X-ray diffraction (XRD). Characterizations of diffuse reflectance UV–vis spectroscopy (DRS), photoluminescence spectroscopy (PL), photocurrent, and electrochemical impedance spectroscopy (EIS) indicated the more excellent photocatalytic property of Fe/Mt./TiO2composite than Mt./Fe-TiO2composite. The energy-resolved distribution of electron traps (ERDT) pattern revealed a distinguished phase composing from the surface to the bulk for both Fe/Mt./TiO2and Mt./Fe-TiO2and demonstrated almost the same photocatalytic property of the TiO2particle surface on both Fe/Mt./TiO2and Mt./Fe-TiO2. The photocatalytic activities test for phenol decomposition on Fe/Mt./TiO2was better than Mt./Fe-TiO2which is consistent with the DRS, PL, photocurrent, and EIS results. A heterojunction between the Mt. and TiO2in Fe/Mt./TiO2was proposed to explain the inconsistency of the photocatalytic property and photocatalytic performance for the two composites and the consistency of the photocatalytic property for the surface of TiO2particles on the composites. To increase the photocatalytic activity of Fe/Mt./TiO2, the electron at the Fermi level on FeIII-doped Mt. may be coupled with the hole on the valance band of TiO2, resulting in effective separation of electron and hole and reduction and/or avoidance of recombination.