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Fabrication of ZnO–TiO2 nanohybrids for rapid sunlight driven photodegradation of textile dyes and antibiotic residue molecules
Optical Materials ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.optmat.2020.110138
Jaspal Singh , Sanjeev Kumar , Rishikesh , Ashis K. Manna , R.K. Soni

Abstract Semiconductor nanohybrids garner huge interest among environmentalists for the various applications owing to their efficiency, cost-effectiveness and benignity. We report the fabrication of TiO2 nanoparticles (TNPs) functionalized ZnO nanoflakes (ZNFs) and their outstanding detoxification ability towards the methylene blue (MB), rhodamine 6G (R6G) and Oxytetracycline (OTC) molecules solution in water. TEM studies confirm the formation of 3D architecture of ZnO–TiO2 nanohybrids while high-resolution transmission electron microscopy assures the uniform functionalization of TNPs over ZNFs. Scanning electron microscopy studies reveal the modulation in the surface morphology with the tenability in volume ratios of Zn and Ti sources. Significant PL quenching in ZnO–TiO2 nanohybrids spectrum as compared to ZNFs confirms the improvement in the charge separation which is highly favorable for the enhancement in the photodegradation efficiency. The 3D architecture of ZnO–TiO2 with volume ratio (Zn: Ti: 4:1) showed superior photodegradation activity and decompose OTC, MB and R6G dye solution within 8 min, 6 min and 30 min respectively under natural solar light (~862 W/cm2). Most efficient ZnO–TiO2 nanohybrid exhibits extremely high rate constant values for MB, R6G and OTC molecules which are 7, 5 and 4.8 times of the rate constant value of pure ZNFs. Extremely superior photodegradation performance of 3D architecture of ZnO–TiO2 nanohybrid could be ascribed to the charge separation and synergistic effect between the TNPs and ZNFs which is responsible for the high density of electrons in the conduction band of ZnO–TiO2 nanohybrids. ZnO–TiO2 nanohybrids reveal the extremely high photodegradation rate for the decomposition of azo dyes and pharmaceutical residue which has not been reported till now.

中文翻译:

制备 ZnO-TiO2 纳米杂化物,用于纺织染料和抗生素残留分子的快速阳光驱动光降解

摘要 半导体纳米杂化物因其效率、成本效益和良性而在各种应用中引起环保主义者的极大兴趣。我们报告了 TiO2 纳米粒子 (TNPs) 功能化 ZnO 纳米薄片 (ZNFs) 的制备及其对亚甲蓝 (MB)、罗丹明 6G (R6G) 和土霉素 (OTC) 分子水溶液的出色解毒能力。TEM 研究证实了 ZnO-TiO2 纳米杂化物的 3D 结构的形成,而高分辨率透射电子显微镜确保了 TNP 在 ZNF 上的均匀功能化。扫描电子显微镜研究揭示了表面形态的调制与 Zn 和 Ti 源体积比的稳定性。与 ZNF 相比,ZnO-TiO2 纳米杂化物光谱中显着的 PL​​ 猝灭证实了电荷分离的改善,这非常有利于光降解效率的提高。具有体积比(Zn:Ti:4:1)的 ZnO-TiO2 的 3D 结构显示出优异的光降解活性,并在自然太阳光(~862 W)下分别在 8 分钟、6 分钟和 30 分钟内分解 OTC、MB 和 R6G 染料溶液/cm2)。最有效的 ZnO-TiO2 纳米杂化物对 MB、R6G 和 OTC 分子表现出极高的速率常数值,是纯 ZNF 速率常数值的 7、5 和 4.8 倍。ZnO-TiO2 纳米杂化物的 3D 结构的极其优异的光降解性能可归因于 TNP 和 ZNF 之间的电荷分离和协同效应,这是导致 ZnO-TiO2 纳米杂化物导带中电子密度高的原因。ZnO-TiO2 纳米杂化物显示出对偶氮染料和药物残留物的分解具有极高的光降解率,迄今为止尚未见报道。
更新日期:2020-09-01
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