Pt/Bi2WO6：具有高可見光光催化性易回收之複合微孔花狀光觸媒材料

Abstract

隨著工業的發展與環保意識的抬頭，為了處理廢水造成的水汙染，光觸媒是具有潛力的環保材料，是近十年來的主要研究之一，本研究透過水熱法及光化學沉積法合成1.5~2 µm的Pt/Bi2WO6微孔花狀複合材料（沉積濃度：0.5％Pt、1％Pt、2％Pt、4％Pt），在掃描式電子顯微鏡(SEM)中顯示Bi2WO6為數個奈米片所組成的花狀結構，透過穿透式電子顯微鏡(TEM)證實Pt納米顆粒成功的沉積於Bi2WO6表面上。此外，沉積的Pt納米顆粒在可見光照射下在促進酸橙7降解中的光催化性能中起了重要作用，以1％Pt的沉積有最佳的光催化活性，相較於純的Bi2WO6光催化活性增加2.8倍，而光催化活性的提升是由於沉積Pt納米粒子增強了可見光吸收，降低了電子電洞對的複合速率並促進了OH自由基的產生。此外，Pt/Bi2WO6微孔花狀結構具有獨特分層結構有助於在水性光催化反應中的循環及再利用，是非常有潛力的光觸媒材料。

With the rise of industrial development and awareness of environmental protection, photocatalysts are potential environmental protection materials for the treatment of water pollution caused by wastewater, and are one of the major researches in the past decade. In this work, 1.5–2 μm Pt/Bi2WO6 composites microflowers were synthesized by hydrothermal synthesis and photo-deposition method (mass concentration: 0.5% Pt, 1% Pt, 2% Pt, 4% Pt). Scanning electron microscopy (SEM) showed that Bi2WO6 was a flower-like structure composed of several nanosquares. It was confirmed by transmission electron microscopy (TEM) that Pt nanoparticles were successfully deposited on the surface of Bi2WO6. In addition, the deposited Pt nanoparticles play an important role in promoting photocatalytic degradation of acid orange II under visible light irradiation, with the best photocatalytic activity for deposition of 1% Pt, compared to pure Bi2WO6 photocatalysis. The increase in activity was 2.8-fold, and the increase in photocatalytic activity was due to the enhanced absorption of visible light by the deposition of Pt nanoparticles, which reduced the recombination rate of electron hole pairs and promoted the generation of OH-. In addition, the Pt/Bi2WO6 compostie microflowers have hierarchical structures and they are easy to settle, which benefits their recycling in photocatalytic reacations .We believe that material is a promising photocatalyst material.