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Shape dependence of photosensitive properties of WO_3 oxide for photocatalysis under solar light irradiation

机译：WO_3氧化物光敏性能的形状依赖性在太阳光照射下的光催化

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摘要

Two morphologies of nanostructured WO3, nanoplatelets (NP) and pseudospheres (PS), were synthesized using a simple chemical route. The obtained powders were structurally characterized using thermal analyses and a combined XRD with Rietveld refinement. Their morphological and growth mechanisms were followed by SEM during the maturation phase. The results showed a square/rectangular shape and pseudospherical morphology, which exhibited a monoclinic phase after calcination at 400 degrees C and an orthorhombic phase after calcination at 500 degrees C. The temperature treatment induced an increase of grain size for the NP lateral size, while the PS size remains temperature independent. The photocatalytic activity was evaluated by the degradation of methylene blue under solar light irradiation. The degradation process was investigated by studying the photosensitive properties, optical absorption, photoluminescence and photoresistance. The photodegradation activity of methylene blue is composed of a rapid and strong adsorption step followed by a photoinduced catalytic process. The PS sample revealed a higher adsorption rate than NP powders at the low calcination temperature, while the photoinduced catalysis is better at the high calcination temperature, reaching 88% at 500 degrees C. The photosensitive properties showed a low luminescence intensity and a long charge carrier recombination time, thus indicating the photocatalytic efficiency of the elaborated samples.
机译：使用简单的化学途径合成纳米结构WO3，纳米键（NP）和假膜（PS）的两种形态。使用热分析和具有Rietveld改进的XRD在结构表征所得粉末。它们在成熟阶段的形态和生长机制之后是SEM。结果表明，正方形/矩形形状和假物形态，其在煅烧后在煅烧后在500℃下煅烧后的煅烧后的单岩相。温度处理诱导为NP横向尺寸的粒度增加PS尺寸保持温度无关。通过在太阳光照射下通过亚甲基蓝的降解来评估光催化活性。通过研究光敏性能，光学吸收，光致发光和光致抗蚀剂来研究降解过程。亚甲蓝的光降解活性由快速且强的吸附步骤组成，然后是光致催化过程。 PS样品揭示了比低煅烧温度低的NP粉末更高的吸附速率，而光致催化在高煅烧温度下更好，达到500℃的88％。光敏性能显示出低发光强度和长电荷载体重组时间，从而表明阐述样品的光催化效率。

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