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All Journal IJCR (Indonesian Journal of Chemical Research) Vitalitas Medis : Jurnal Kesehatan Dan Kedokteran Jurnal Kimia Unand
Safni
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Health Professions Materials Science & Nanotechnology Public Health

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THE POTENTIAL OF PALM SHELL ACTIVATED CARBON AS AN ADSORBENT FOR HEAVY METALS IN THE RECYCLING PROCESS OF USED LUBRICATING OIL Zilfa, Zilfa; Safni; Amanda, Selya
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 9 No. 1 (2024): Volume 9, ISSUE 1,2024
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol9.iss1.art3

Abstract

With the increasing industrial and transportation activities, the demand for lubricating oil is increasing every year. Lubricating oil is used to reduce friction and wear on frictional engine components. Over time, lubricating oil becomes inefficient and needs to be replaced with new oil. To enhance the efficiency of petroleum use and reduce environmental pollution, used lubricants need to be recycled. One method of improving the quality of used lubricants is by absorbing heavy metal contaminants using activated carbon from palm kernel shells. The efficiency of activated carbon adsorption as an adsorbent for heavy metals in used lubricants was observed by varying the adsorption parameters of contact time, adsorbent mass, and sample volume. In this study, the absorption of several heavy metals, including iron (Fe), lead (Pb), and zinc (Zn), was investigated. Analysis of the absorption results was performed using AAS, FTIR, XRD, and XRF. The results showed that the absorption of metals in used lubricants using activated carbon from palm kernel shells with optimum parameters can absorb 90% of Fe, Pb, and Zn metals. The optimum contact time for each metal adsorption was 3 hours, with an adsorbent mass of 0.75 grams and a sample volume of 5 mL. Analysis of used lubricants before and after adsorption using FTIR indicated a shift in wave numbers, indicating an adsorption process.
Degradation of Remazol Yellow FG by Sonolysis and Photolysis with TiO2/Active Carbon Rice Husk (TiO2/AC) Catalyst and Analysis Using Spectrophotometer UV-Vis Safni; Putri, Anggi Nabila; Deswati, Deswati; Zilfa, Zilfa
Jurnal Kimia Unand Vol. 13 No. 2 (2024): November 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.2.34-40.2024

Abstract

Remazol Yellow FG is one of the dyes that are often used in the textile industry because it is accessible and reasonably priced. The non-biodegradable dyes produce waste and inhibit sunlight from passing through the water. In this study, we performed Fourier Transform Infrared (FTIR) to characterise the activated carbon of rice husk and TiO2/activated carbon rice husk (TiO2/AC) using Diffuse Reflectance Spectroscopy UV-Vis (DRS UV-Vis). Remazol Yellow FG was degraded by using sonolysis and photolysis under UV ray (λ = 254 and 365 nm) and visible ray. We performed the experiments using a variety of variables which consist of catalyst dosage (10–50 mg), contact time (1–6 hours), catalyst type (AC, TiO2 and TiO2/AC), lamp type (365 nm, 254 nm and visible lamp) and initial Remazol Yellow FG concentration (10–30 mg/L) to determine the degradation percentage. We found that the addition of TiO2/AC catalyst increased the degradation percentage of Remazol Yellow FG from 6,86% to 52,62% using sonolysis and 8,34% to 95,02% using photolysis. Hence, we concluded that TiO2/AC catalyst from rice husk could be an effective catalyst for the Remazol Yellow FG degradation.
Influence of Calsination Temperature on Zeolite Synthesis from Non-Hazardous Wastes and Its Application as an Adsorbent of Mn Metal Ion Septiani, Upita; Syukri; Mia Yeliandri; Safni; Zilfa
Jurnal Kimia Unand Vol. 14 No. 1 (2025): May 2025
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.14.1.29-35.2025

Abstract

In this research, zeolite material was synthesized by hydrothermal method using non- hazardou waste of fly ash as the raw material at low crystallization temperatures of 70oC with seawater as solvent. The effect of calsination temperature on synthesis of zeolite was studied, and the ability of synthesized zeolite to adsorb Mn metal ion in aqueous solution was also investigated. The synthesized zeolite was characterized by Fourier Transform Infra-Red (FT-IR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM-EDS), and Surface Area Analyzer (SAA). Based on the results of XRD, the type of zeolites produced from the synthesized zeolite are zeolite X and sodalite. The synthesized zeolite was then tested for the adsorption of Mn metal ion, using atomic absorption spectrophotometer (AAS) and it was found that the zeolite material synthesized calcined 550oC had the highest adsorption capacity compared to other synthesized zeolite materials, where the maximum adsorption was 192,31 mg/g.
Degradation of Pesticide Residues Cherizeb and Emacel in Chili Washing Water using ZnO/Zeolite Catalyst through Photolysis Zilfa; Safni; Benny Damas Putra
Vitalitas Medis : Jurnal Kesehatan dan Kedokteran Vol. 3 No. 2 (2026): April: Vitalitas Medis : Jurnal Kesehatan dan Kedokteran
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/vimed.v3i2.3014

Abstract

Chili (Capsicum annuum L) ) is one of the most important horticultural commodities widely consumed in Indonesia and has high economic value. To maintain productivity and prevent pest attacks, farmers commonly apply chemical pesticides intensively. However, excessive and improper pesticide application can leave harmful residues on the surface and within the tissues of chili fruits. The accumulation of these residues not only poses health risks to consumers but also contributes to environmental pollution, particularly in wastewater generated from chili washing activities. This study aims to reduce pesticide residues of Cherizeb and Emacel in chili washing water using the photolysis methodassisted by a ZnO/zeolite catalyst. Zinc oxide (ZnO) acts as a photocatalyst activated by ultraviolet (UV) light to produce reactive hydroxyl radicals (•OH) capable of decomposing complex organic compounds into simpler compounds such as CO₂ and H₂O. Meanwhile, zeolite is used as a catalyst support due to its large surface area and high adsorption capacity, allowing adsorption and photocatalytic processes to occur simultaneously. The results showed that the photolysis method using the ZnO/zeolite catalyst significantly reduced pesticide residues, with optimum degradation efficiencies of 85.66% for Cherizeb using 0.8 g ZnO/zeolite under UV irradiation for 60 minutes, and 83.97% for Emacel using 0.8 g ZnO/zeolite under UV irradiation for 75 minutes. The samples were characterized using Fourier Transform Infrared Spectroscopy (FTIR) to identify functional groups, indicating the disappearance of specific organic functional groups. Pesticide residues on chili samples were analyzed using UV-Vis spectrophotometry to determine concentrations before and after treatment. X-Ray Diffraction (XRD) analysis confirmed that the crystalline structure of the catalyst remained stable after the photolysis process. Based on these findings, the ZnO/zeolite catalyst is proven to be effective in reducing pesticide residues through photocatalytic degradation and has the potential to be applied as a safe, efficient, and environmentally friendly post-harvest technology to improve the quality of agricultural products.
Co-Authors Amanda, Selya Benny Damas Putra Deswati Deswati Mia Yeliandri Putri, Anggi Nabila Syukri Upita Septiani Zilfa Zilfa