ZnO-Enhanced Reduced Graphene Oxide Electrodes from Cocoa Shell: Nanoarchitectonics Platform for Photoelectrocatalytic Detection of Methylene Blue

In this study, we report the successful preparation of reduced graphene oxide modified zinc oxide (rGO-ZnO) composites from cocoa shells. Synthesis of rGO-ZnO was carried out using the Hummer method and thermal reduction. The electrode material was comprehensively characterized using fourier-transfo...

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Bibliographic Details
Published in:Journal of Oleo Science 2023, Vol.72(12), pp.1133-1140
Main Authors: Azis, Thamrin, Muzakkar, Muhammad Zakir, Nurwahida, Andi Tenri, Dali, Nasriadi, Kadir, La Ode Abdul, Lestari, Dian Ayu, Salim, La Ode Agus
Format: Article
Language:eng ; jpn
Subjects:
Cocoa
Electrical measurement
Electrode materials
Electrodes
Fourier transforms
Graphene
Industrial water
Infrared spectroscopy
Methylene blue
photoelectrocatalysis
Regeneration
rGO
Scanning electron microscopy
Thermal reduction
Voltammetry
X-ray diffraction
Zinc oxide
Zinc oxides
ZnO
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Summary:In this study, we report the successful preparation of reduced graphene oxide modified zinc oxide (rGO-ZnO) composites from cocoa shells. Synthesis of rGO-ZnO was carried out using the Hummer method and thermal reduction. The electrode material was comprehensively characterized using fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy & Energy Dispersive X-ray (SEM-EDX). The photoelectrocatalytic performance of the prepared composite electrodes was evaluated using various electrochemical techniques, including Linear Sweep Voltammetry (LSV), Cyclic Voltammetry (CV), and Multi Pulse Amperometry (MPA). The FTIR analysis of rGO-ZnO exhibited distinct bands corresponding to C-O at 1022 cm-1, C=C at 1600 cm-1, and Zn-O at 455 cm-1. The XRD analysis revealed characteristic peaks at 26.6º, 29.2º, 36.2º, 44.04º, 47.58º, and 64.4º, confirming the presence of key crystalline phases. SEM-EDX analysis of rGO-ZnO revealed a rough surface morphology with bright white and black regions, signifying the coexistence of ZnO and rGO with carbon, oxygen, and zinc contents of 78.98%, 17.46%, and 3.56%, respectively. The investigations involved the photoelectrochemical profiles of methylene blue organic dyes at different concentrations, ranging from 0.5 ppm to 3.0 ppm. The acquired findings offer valuable understanding into the photoelectrocatalytic effectiveness of the composite electrodes containing rGO-ZnO, suggesting their potential use in potential scenarios involving the revitalization of the environment in industrial water systems.
ISSN:1345-8957
1347-3352
DOI:10.5650/jos.ess23152