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首页> 外文期刊>RSC Advances >Photocatalytic-degradation and reduction of organic compounds using SnO2 quantum dots (via a green route) under direct sunlight
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Photocatalytic-degradation and reduction of organic compounds using SnO2 quantum dots (via a green route) under direct sunlight

机译：在阳光直射下使用SnO2量子点（通过绿色路线）光催化降解和还原有机化合物

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SnO2 Quantum Dots (QDs) were synthesized by a facile and green biological method using sugar cane juice. The biomolecules present in the juice act as complexing as well as capping agents. No other external agents are required for the production of the SnO2 Quantum Dots (QDs). This method resulted in the formation of spherical SnO2 QDs having a particle size of similar to 3-4.5 nm with a tetragonal crystal structure. The biosynthesized SnO2 QDs were characterized by transmission electron microscopy (TEM), selected area electron diffraction (SAED), Energy Dispersive Spectroscopy (EDS) and Fourier transform infrared spectroscopy (FT-IR). The optical properties were investigated using UV-visible spectroscopy. In the electronic spectra, a clear blue shift in the band gap energy is observed with a decrease in particle size. This is because of three dimensional quantum confinement effects. The biosynthesized SnO2 QDs act as an efficient photocatalyst for the degradation of rose bengal and methylene blue dye under direct sunlight. The catalytic activity of the biosynthesized SnO2 QDs were also evaluated by the conversion of p-nitrophenol to p-aminophenol in the presence of NaBH4. The reaction was carried out in a green solvent i.e., water at room temperature. It was observed that 99.5% of p-nitrophenol was reduced in the presence of SnO2 QDs within 60 min. These investigations indicate that the biosynthesized SnO2 QDs may be effective and potential materials for the elimination of hazardous pollutants from wastewater.
机译：SnO2量子点（QDs）是使用甘蔗汁通过简便且绿色的生物方法合成的。果汁中存在的生物分子既可以作为络合剂，也可以作为封端剂。 SnO2量子点（QD）的生产不需要其他外部试剂。该方法导致形成具有四方晶体结构的粒径近似于3-4.5nm的球形SnO 2 QD。通过透射电子显微镜（TEM），选择区域电子衍射（SAED），能量色散光谱（EDS）和傅里叶变换红外光谱（FT-IR）对生物合成的SnO2量子点进行了表征。使用紫外-可见光谱研究光学性质。在电子光谱中，随着颗粒尺寸的减小，观察到带隙能量发生了明显的蓝移。这是由于三维量子限制效应。生物合成的SnO2量子点在阳光直射下可作为降解玫瑰红和亚甲基蓝染料的有效光催化剂。还通过在NaBH4存在下将对硝基苯酚转化为对氨基苯酚来评估生物合成的SnO2 QD的催化活性。反应在绿色溶剂，即室温下的水中进行。观察到，在SnO2 QD存在下60分钟内，还原了99.5％的对硝基苯酚。这些研究表明，生物合成的SnO2 QDs可能是消除废水中有害污染物的有效和潜在材料。

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