Superior dye degradation using SnO₂-ZnO hybrid heterostructure catalysts
Superior dye degradation using SnO₂-ZnO hybrid heterostructure catalysts / Shama Sehar, Iffat Naz, Irum Perveen, Safia Ahmed
p. 56-62 ; 29 cm
수록자료: Korean journal of chemical engineering. Korean Institute of Chemical Engineers. Vol.36 No.1(2019 January), p. 56-62 36:1<56 ISSN 0256-1115 저자: Shama Sehar, School of Biotechnology and Biomolecular Sciences, The University of New South Wales 저자: Iffat Naz, Department of Biochemistry, Deanship of Educational Services, Qassim University 저자: Irum Perveen, Environmental Microbiology Laboratory, Department of Microbiology, Faculty of Biological Sciences, Quaid-i-Azam University 저자: Safia Ahmed, Environmental Microbiology Laboratory, Department of Microbiology, Faculty of Biological Sciences, Quaid-i-Azam University
We investigated the efficiency of oxide based hierarchical heterostructure as adsorbent for the treatment of organic dyes, Methyl orange (MO) and Methylene Blue (MB), containing solution. Nanocrystals such as ZnO nanorods (at various temperatures of 30, 60 and 75 °C) and SnO₂ nanoparticles were synthesized by electrodeposition method and hydrothermal approaches, respectively. SnO₂-ZnO heterostructures were formed by spin coating SnO₂ nanoparticles on ZnO nanorods matrix to form a heterostructured film. The surface morphologies and structural characterization of as-prepared heterostructures were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. While, absorption spectra of all samples were examined by UV-vis diffuse reflectance spectroscopy. The photocatalytic activities of as-prepared samples for organic dyes degradation were tested under UV light as model reaction. The SnO₂-ZnO heterostructured photocatalyst showed superior activities than individual ZnO and SnO₂ nanocrystals. This heightened behavior was attributed to its better charge separation capability and the slow charge recombination originating due to difference in energy values of conduction band edges of SnO₂ and ZnO. The SnO₂-ZnO heterostructure demonstrated better stability and recyclability up to five times, which is highly desirable for potential industrial applications including dye degradation and wastewater treatment systems.