Characterization and photocatalytic activity of Al 2 O 3 nanopores/InSnO 2 electrode for methyl orange degradation
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Characterization and photocatalytic activity of Al2O3 nanopores/ InSnO2 electrode for methyl orange degradation Sevgi Ateş1 · Evrim Baran Aydın2 · Birgül Yazıcı1 Received: 16 March 2020 / Accepted: 17 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this research work, the photocatalytic degradation methyl orange (MO) was carried out using A l2O3-NP/InSnO2 nanocomposite under UV illumination. The Al2O3-NP electrode was successfully formed by a two-step anodization method and Al2O3-NP/InSnO2 electrode was obtained via the sol–gel spin coating method. The structural properties of the samples have been characterized by a series of techniques, including field-emission scanning electron microscope, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and the contact angle and surface energy measurements. The influence of variables such as initial MO concentration, initial pH value, temperature, and reusability was researched. The kinetics of the photocatalytic degradation of MO can be best described by the pseudo-first-order model. Moreover, the activation energy (Ea), change of enthalpy (ΔH), free energy (ΔG), and entropy (ΔS) are evaluated. The activation energy has been found at 20.89 kJ/mol. The results indicated that the Al2O3-NP/InSnO2 photocatalyst has an excellent activity for photocatalytic degradation in the treatment of wastewater.
1 Introduction Nanoporous anodic alumina (NPA) is a membrane material with a wide range of applications in fields such as photocatalytic, magnetic medium, optoelectronics, filtration and purification, and biosensors and photonics [1–5]. Due to the perfect periodicity of the pores, interpore spacing, and the ability to control the pore diameters, the NPA membrane produces composite materials with novel features and important improvements in their functionality [1, 6, 7]. The NPA structure is a highly ordered hexagonal array of pillared cells, with the pore size, pore interval, and thickness controllable by choosing suitable anodization conditions, such as applied voltage, kind of electrolyte, anodization Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10854-020-04032-z) contains supplementary material, which is available to authorized users. * Sevgi Ateş [email protected] 1
Department of Chemistry, Science and Letters Faculty, Çukurova University, Adana 01330, Turkey
Advanced Technology Application and Research Center (ATARC), Department of Mechanical Engineering, Faculty of Engineering and Architecture, Kilis 7 Aralık University, Kilis, Turkey
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time, and temperature [8–12]. The synthesis of nanoporous anodic aluminum oxide has proved to be an elegant, fast, and easy fabrication and inexpensive; it yields an elevated aspect ratio and highly uniform pore dimensions [13]. For obtaining the highly ordered NPA, Masuda et al. [14] proposed a two-step anodization technique. It is well known that NPA membranes can be readily synthesized via anodiza
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