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All Journal JURNAL KIMIA SAINS DAN APLIKASI
Surya Lubis
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Darussalam 23111, Banda Aceh|Universitas Syiah Kuala|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Green Synthesis, Characterization, and Photocatalytic Activity of Zinc Oxide Nanoparticles on Photodegradation of Naphthol Blue Black Dye Jesisca Silver; Surya Lubis; Muliadi Ramli
Jurnal Kimia Sains dan Aplikasi Vol 26, No 9 (2023): Volume 26 Issue 9 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.9.363-371

Abstract

Zinc oxide (ZnO) nanoparticles have been successfully synthesized using water extract of red dragon fruit (Hylocereus polyrhizus) stem with zinc acetate dihydrate as a precursor of ZnO. Chemical compounds contained in the red dragon fruit stem extract, such as phenolics, terpenoids, and steroids, acted as reducing agents, stabilizers, and capping agents. The phase structure, crystallite size, functional groups, shape, and morphology of ZnO nanoparticles were determined by X-ray diffraction (XRD), Fourier Transform infrared (FT-IR) Spectroscopy, and Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX). The XRD pattern confirmed the crystallinity of synthesized zinc oxide was in the zincite (ZnO) phase with an average crystallite size of 79.09 nm. Spectroscopy FTIR analysis showed that the synthesized ZnO nanoparticles had characteristics similar to the ZnO standard/commercial. SEM-EDX analysis revealed that the synthesized ZnO nanoparticles were spherical, evenly distributed, and homogeneous particle size. The photocatalytic activity of synthesized ZnO nanoparticles was evaluated on the photodegradation of naphthol blue black (NBB) dye. The results showed that the synthesized ZnO nanoparticles have high photocatalytic activity that can degrade NBB dye up to 98.82%. This high photocatalytic activity was obtained at operating parameter conditions with the initial pH of NBB at 2, the dosage of ZnO nanoparticles at 250 mg, and the initial dye concentration at 10 ppm.
Biogenic Synthesis of TiO₂ Nanoparticles Mediated by the Ethanol Extract of Avocado Peel and Its Photocatalytic Activity on the Degradation of Rhodamine B Devi Andalusia; Surya Lubis; Muliadi Ramli; Irfan Mustafa; Cantik Oriza Siregar
Jurnal Kimia Sains dan Aplikasi Vol 29, No 3 (2026): Volume 29 Issue 3 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.3.207-216

Abstract

The synthesis of TiO2 nanoparticles (TiO2 NPs) by the green approach is highly preferred due to its non-toxicity and environmentally friendly nature. In this work, TiO2 NPs were synthesized using titanium tetra isopropoxide (TTIP) and ethanol extract of avocado peel (Persea americana Mill). The ethanol extract of avocado peel (EEAP) contained secondary metabolites including: phenolics, flavonoids, alkaloids, saponins, and terpenoids. These compounds play a role as bioreductor to reduce metal ion, and as capping and stabilizing agents to control nanoparticle growth and prevent aggregation. The total phenolic content (TPC) of the EEAP estimated using the Folin-Ciocalteu method and the total flavonoid content (TFC) evaluated using a colorimetric assay that involved aluminium chloride were 79.75 mg GAE/g and 21.74 mg QE/g, respectively. The characterization of as-synthesized TiO2 NPs was carried out using Fourier Transform Infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDX), and UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS). The XRD patterns confirmed that the crystalline phase of TiO2 NPs was anatase and rutile with an average crystallite size of 19.27 nm. The TiO2 NPs had a spherical shape with Ti, O and C contents 84.9%, 10.24% and 4.86%, respectively. The optical band gap of TiO2 NPs was found to be 3.16 eV. The TiO2 NPs were used as photocatalyst for degradation of rhodamine B (RhB) dye in batch photoreactor. The TiO2 NPs exhibited high photocatalytic activity on degradation of RhB dye with degradation percentage up to 96.39% after 120 minutes of UV irradiation and 98.98% after 30 minutes of sunlight irradiation. The higher degradation percentage of RhB under sunlight compared to UV irradiation can be ascribed to the broad spectrum of sunlight and dye sensitization mechanism. Moreover, the obtained results confirmed that the biogenic synthesized TiO2 NPs present a promising approach for the removal of organic pollutants and could be effectively utilized in wastewater treatment processes.
Co-Authors Cantik Oriza Siregar Devi Andalusia Irfan Mustafa Jesisca Silver Muliadi Ramli