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Effect of morphology and temperature treatment control on the photocatalytic and photoluminescence properties of SrWO4 crystals.
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2020-01-24 , DOI: 10.1039/c9pp00331b
Nadine Dirany 1 , Abdelali Hallaoui , Jean Christophe Valmalette , Madjid Arab
Affiliation  

This work reports the combined effect of the morphology and crystallization degree of the strontium tungstate (SrWO4) scheelite structure on its photocatalytic and photoluminescence properties. The difference in the precursor ratio leads to two morphologies, spindle and sphere, which remain unchanged with heat treatment up to 500 °C. However, the crystallite sizes of the as-obtained samples and samples treated at 300 and 500 °C are about 50-74 nm for spindles and 44-110 nm for spheres. Both morphologies and thermal treatments lead to the variation in the photoluminescence and photodegradation of rhodamine (RhB) and methylene blue (MB) dyes under UV irradiation. A stronger photodegradation efficiency was found for RhB (90%) than for MB (72%). The photoinduced mechanism is more significant for RhB and becomes more efficient for samples treated at high temperature, while the photocatalysis of MB is weak due to the adsorption process. A broad visible photoluminescence band was observed at room temperature and chromaticity coordinates were identified, which confirmed the emission wavelength. The most intense photoluminescence was obtained for samples treated at 300 °C, corresponding to the optimal disordered structures and accompanied by a redshift wavelength for both spheres and spindles. In this case, the spindles showed the most intense photoluminescence, almost ten times higher than that in spheres.

中文翻译:

形态和温度控制对SrWO4晶体光催化和光致发光性能的影响。

这项工作报告钨酸锶(SrWO4)白钨矿结构的形态和结晶度对其光催化和光致发光性能的综合影响。前驱体比率的差异导致纺锤形和球形两种形态,在高达500°C的热处理条件下它们保持不变。但是,所得样品以及在300和500°C下处理过的样品的微晶尺寸对于纺锤体约为50-74 nm,对于球体约为44-110 nm。形态和热处理都会导致若丹明(RhB)和亚甲基蓝(MB)染料在紫外线照射下的光致发光和光降解变化。发现RhB(90%)比MB(72%)的光降解效率更高。对于RhB而言,光诱导机理更为重要,对于在高温下处理的样品,其光诱导机理变得更为有效,而MB的光催化作用由于吸附过程而较弱。在室温下观察到宽的可见光致发光带,并且鉴定了色度坐标,这确认了发射波长。在300°C下处理的样品获得最强的光致发光,对应于最佳的无序结构,并伴有球形和纺锤形的红移波长。在这种情况下,纺锤体显示出最强烈的光致发光,几乎是球体的十倍。在室温下观察到宽的可见光致发光带,并且鉴定了色度坐标,这确认了发射波长。在300°C下处理的样品获得最强的光致发光,对应于最佳的无序结构,并伴有球形和纺锤形的红移波长。在这种情况下,纺锤体显示出最强烈的光致发光,几乎是球体的十倍。在室温下观察到宽的可见光致发光带,并且鉴定了色度坐标,这确认了发射波长。在300°C下处理的样品获得最强的光致发光,对应于最佳的无序结构,并伴有球形和纺锤形的红移波长。在这种情况下,纺锤体显示出最强烈的光致发光,几乎是球体的十倍。
更新日期:2020-02-19
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