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Role of reduced graphene oxide in improving interfacial charge transfer of hybridized rGO/silica/zirconia for enhanced Bisphenol A photodegradation

Hassan, N. S. and A. Jalil, A. and Khusnun, N. F. and Ali, M. W. and Haron, S. (2019) Role of reduced graphene oxide in improving interfacial charge transfer of hybridized rGO/silica/zirconia for enhanced Bisphenol A photodegradation. Journal of Alloys and Compounds, 789 . pp. 221-230. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2019.03.105

Abstract

An effective photocatalyst for environmental rehabilitation, reduced graphene oxide (rGO) supported on silica-zirconia (Si/Zr) was synthesized by simple microwave and sonication methods after varying rGO loading (1, 5 and 10 wt%), and denoted as 1, 5 and 10 rGO/Si/Zr. The catalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption, Fourier-transform infrared (FTIR), electron spin resonance (ESR), and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS) analyses. Catalytic activity towards photodegradation of Bisphenol A (BPA) was ranked in the following order: 5 rGO/Si/Zr (87%) > 1 rGO/Si/Zr (81%) > 10 rGO/Si/Zr (71%). The highest photoactivity of 5 rGO/Si/Zr was found to be due to the excess unpaired electrons in Si/Zr, induced by the rGO, which resulted in a remarkable excitation of electrons and, subsequently, accelerated the photocatalytic activity. In addition, optimum carbon–support interactions possessed by the 5 rGO/Si/Zr improved the interfacial charge transfer at a strategic energy level of rGO and efficiently suppressed the electron–hole recombination. The photokinetics of degradation followed the pseudo-first-order Langmuir-Hinshelwood model. The ESR trapping and scavenger experiments further confirmed that the photogenerated electron played a crucial role in mediating the degradation of BPA. The 5 rGO/Si/Zr was still active after 5 runs, indicating its potential for degradation of BPA in wastewater from the plastics industry. The 5 rGO/Si/Zr also demonstrated lower energy consumption and cost estimation towards the photodegradation of BPA.

Item Type:Article
Uncontrolled Keywords:interactions, interfacial charge transfer, unpaired electrons
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:88441
Deposited By: Yanti Mohd Shah
Deposited On:15 Dec 2020 08:06
Last Modified:15 Dec 2020 08:06

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