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Kovalen: Jurnal Riset Kimia
ISSN 2477-5398 · Tadulako University · 337 artikel di indeks
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Artikel Jurnal
Design and Optimization of Fe Doped TiO2 Photocatalytic Reactors for Pollutant Degradation: A Systematic Literature Review
Environmental pollution caused by industrial wastewater containing persistent organic compounds has become a major global concern. Photocatalytic technology based on titanium dioxide (TiO2) has attracted significant attention due to its strong oxidation capability, chemical stability, and…
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Artikel Jurnal
Effect of Spent Coffee Grounds on the Organoleptic Properties, pH, Moisturizing Effect, and Skin Irritation of Body Scrub Formulated with Waste Cooking-Olive Oils Liquid Soap
Spent coffee grounds (SCG) have potential as a sustainable exfoliating material for body scrub formulations. This study evaluated the effects of systematically varying the proportions of SCG and liquid soap derived from waste cooking oil and olive oil on the organoleptic properties, pH…
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Artikel Jurnal
Formulation of Encapsulated Extracts from Local Palu Red Onion Bulbs (Allium cepa var. aggregatum L.) Using Carrageenan Coating: Characterization, Stability, and Antioxidant Activity
This study aimed to identify the optimal concentration of carrageenan as a coating matrix for extracts of local Palu red onion bulbs (Allium cepa var. aggregatum L.) using the ion gelation method to characterise their properties, stability and antioxidant activity. The technique of converting…
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Artikel Jurnal
Effect of Column Diameter on the Performance of an Ion Exchange System in Reducing Water Hardness
Ion exchange is an effective method for removing hardness ions such as Ca2+ and Mg2+ from water, and its performance is strongly influenced by column design parameters. This study aims to evaluate the effect of column diameter on the efficiency of a sequentially operated cation–anion ion exchange…
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Artikel Jurnal
Preconcentration of Cr (VI) Using Ca-Alginate-EDTA Microcapsules in a Column System for UV-Vis Spectrophotometric Analysis
This study introduces optimized Ca-Alg-EDTA microcapsules specifically designed as a high-performance column filler for the preconcentration and sensitive detection of toxic Cr(VI) in aquatic systems. Monitoring Cr(VI) at trace levels is critical due to its high toxicity and environmental…
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Artikel Jurnal
Effect of Extraction Time and Sodium Bisulfite on Citronella (Cymbopogon nardus) Extract: Yields, Moisture, and GC-MS Analysis
This study investigated the influence of extraction time and sodium bisulfite concentration on citronella (Cymbopogon nardus) extracts using ethanol as solvent. Nine treatments (P1–P9) were evaluated for yield, moisture content, and preliminary TLC screening. The highest yield (59.94%) was obtained…
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Artikel Jurnal
Characterization and Biodegradation Test of Palm Kernel Meal Galactomanan-Based Bioplastics with Succinic Acid-Polyvinyl Alcohol Cross-Linking Agent
Environmental pollution caused by non-biodegradable plastic waste has become a major global concern, prompting the development of eco-friendly alternative materials. Bioplastics derived from natural polymers are considered a promising solution due to their biodegradability and renewability. A study…
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Artikel Jurnal
Hydrophobicity Properties of Silica-Dimethylsilicone Oil-Stearic Acid Based Materials Applied as Waterproof Coating Materials
Geothermal solid waste is one of the byproduct materials from the geothermal energy process. The silica extracted from this solid waste can be utilized as a raw material for waterproof coatings. The waterproof or hydrophobic properties in this study have been studied with a formulation of silica…
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Artikel Jurnal
In Silico Analysis of Imidazole Derivatives Targeting Estrogen Receptor Alpha as Anti-Breast Cancer Candidates
Breast cancer is one of the leading causes of mortality among women worldwide and is frequently associated with the overexpression of Estrogen Receptor alpha (ERalpha). This study aimed to evaluate the potential of imidazole derivatives as anticancer candidates targeting ERalpha (PDB ID: 3ERT)…
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Artikel Jurnal
Photodegradation of Crystal Violet Dyes Using Fe2O3/CuO with the Addition of MEA Additive
Synthetic dyes, including Crystal Violet (CV), are widely used in the textile and chemical industries and are increasingly released into the environment due to their toxic, mutagenic, and non-biodegradable nature. The purpose of this work is to examine the photocatalytic degradation of CV utilising…
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Artikel Jurnal
Engineering and Application of Fe-TiO2/MOR Zeolite Photocatalysts for the Photodegradation of Methylene Blue Dye Waste
The use of dyes such as methylene blue is widespread. However, if methylene blue is discharged without prior treatment, it can lead to pollution problems. In this study, the engineering of zeolites and the degradation mechanism of methylene blue using Fe-TiO2/MOR zeolite as a photocatalyst were…
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Artikel Jurnal
Speciation and Bioavailability of Heavy Metals Pb and Cd in Palu Bay Sediments after the Earthquake and Tsunami
Major disturbances to seafloor morphology and input of terrestrial material due to the earthquake- tsunami in Palu City in 2018 have the potential to alter the chemical form (speciation), bioavailability, and flux of lead (Pb) and cadmium (Cd) in Palu Bay sediments. This study was conducted to…
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Artikel Jurnal
Comparative Estimation of Some Contaminates in Products of Drinking Water Companies and Government Stations in the City of Mosul
Recently, the concentrations of heavy metals have increased in water sources, soil and air, and their symptoms have clearly appeared on living organisms and the serious effects they leave on humans, animals and even plants. has become necessary to periodically monitor these metals, including nickel…
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Artikel Jurnal
Formulation and Characterization of Soursop Leaf extract (Annona muricata L.) Nanoemulsion Using VCO and Tween 80
Methanol extract of soursop leaves contains various bioactive compounds such as alkaloids, saponins, tannins, and flavonoids. To increase the absorption of these compounds, a nanoemulsion formulation of soursop leaf extract was carried out. Extraction was carried out using the maceration method…