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Enhanced photocatalytic activity of reduced graphene oxide/SrSnO3 nanocomposite for aqueous organic pollutant degradation
Optik ( IF 3.1 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.ijleo.2019.164055
G. Venkatesh , M. Geerthana , S. Prabhu , R. Ramesh , K.M. Prabu

In this present work, a novel heterostructure rGO - SrSnO3 nanocomposites with different weight percentage of reduced graphene oxide were successfully synthesised by hydrothermal method. The formation of crystalline structure, morphology, elemental composition and optical properties were characterized using Powder X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), Energy dispersive X-ray analysis (EDX), and UV–vis diffuse reflectance spectroscopy (UV DRS) and photoluminescence (PL) spectroscopy techniques. The photocatalytic activity of pure and composite materials was assessed by degradation of aqueous methylene blue dye under UV light irradiation. The highest degradation efficiency of 97 % was obtained for 10 wt.% rGO - SrSnO3 composite. Enhancement in the photocatalytic activity is mainly due to the suppressed photoexcited charge carrier’s recombination rate. Moreover, the reusable and stability of the photocatalyst demonstrated after four consecutive runs of photocatalytic test.



中文翻译:

还原型氧化石墨烯/ SrSnO 3纳米复合材料的光催化活性对水性有机污染物的降解

在本工作中,一种新型异质结构rGO-SrSnO 3通过水热法成功地合成了不同重量百分比的氧化石墨烯纳米复合材料。利用粉末X射线衍射(XRD),场发射扫描电子显微镜(FESEM),透射电子显微镜(TEM),傅里叶变换红外光谱(FTIR),能量色散X射线分析(EDX)以及紫外可见漫反射光谱(UV DRS)和光致发光(PL)光谱技术。通过在紫外光照射下降解亚甲基蓝染料水溶液来评估纯材料和复合材料的光催化活性。10 wt。%rGO-SrSnO 3的最高降解效率为97%综合。光催化活性的提高主要是由于抑制了光激发电荷载流子的复合速率。此外,在连续四次光催化测试之后,证明了光催化剂的可重复使用性和稳定性。

更新日期:2020-01-27
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