Abstract

Due to rapid increased in water toxicity by organic dyes and to fulfill the energy crises, development of efficient photocatalyst has attracted a lot of research attention. Therefore, in this work, an immensely effective photocatalyst TiO₂/Ga₂O₃@MIL-125(Ti) has been developed via incorporation of TiO₂/Ga₂O₃ nanocomposite into MIL-125(Ti) by using refluxed method. Powdered XRD, SEM and UV-VIS spectroscopy methods are used for the accurate characterization of synthesized samples. These techniques reveal that all the synthesized materials have been successfully formed. It also shows that heterojunctions have been successfully developed via incorporation of pre-synthesized materials into host MOF. All the synthesized samples are used to study photodegradation efficiency of methylene blue and photoelectrochemical oxygen evolution reaction via water splitting. It has been observed that TiO₂/Ga₂O₃@MIL-125(Ti) has been emerged as highly effective catalyst toward photodegradation of methylene blue as well as oxygen evolution reaction. This high efficiency is due to collaborative effect and heterojunction formation of TiO₂/Ga₂O₃ nanocomposites with central metallic cluster of MIL-125(Ti), which increases the charge separation, reduces the electron-hole pair recombination and enhances the absorption of visible light. TiO₂/Ga₂O₃@MIL-125(Ti) has been photodegraded methylene blue upto 40.29% and delivers 100 mAcm⁻² at just 318 mV overpotential.

摘要

由于有机染料对水的毒性迅速增加以及应对能源危机，高效光催化剂的开发引起了很多研究关注。_{因此，在这项工作中，通过掺入 TiO 2} /Ga ₂ O ₃开发了一种非常有效的光催化剂 TiO ₂ /Ga ₂ O ₃ @MIL-125(Ti)采用回流法将纳米复合材料制成 MIL-125(Ti)。粉末 XRD、SEM 和 UV-VIS 光谱法用于合成样品的准确表征。这些技术表明所有合成材料都已成功形成。它还表明，通过将预合成的材料掺入主体 MOF 中已经成功地开发了异质结。所有合成的样品都用于研究亚甲蓝的光降解效率和水分解光电化学析氧反应。已经观察到，TiO ₂ /Ga ₂ O ₃@MIL-125(Ti) 已成为亚甲基蓝光降解和析氧反应的高效催化剂。这种高效率是由于 TiO ₂ /Ga ₂ O ₃纳米复合材料与 MIL-125(Ti) 中心金属簇的协同效应和异质结形成，这增加了电荷分离，减少了电子-空穴对的复合并增强了吸收可见光。TiO ₂ /Ga ₂ O ₃ @MIL-125(Ti) 已被光降解达 40.29% 的亚甲蓝，并在仅 318 mV 的过电位下提供 100 mAcm ^{-2的电流。}