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All Journal G-Tech : Jurnal Teknologi Terapan
Dwi Ana Anggorowati
Institut Teknologi Nasional Malang, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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The Effect of Solvent and Amine Concentration on the Modification of Silica Sand Waste by Grafting Method as an Adsorbent Dominica Edora Stella Raharjanto; Dwi Ana Anggorowati; Nanik Astuti Rahman
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7718

Abstract

Industrial waste is all types of waste materials or residual materials originating from the results of an industrial process. One of the industrial wastes in solid form is silica sand waste from the sandblasting process which has the potential to be used as a source of silica for adsorbents. This experiment is conducted to determine the type of solvent and the best addition volume of APTES in silica modification using amine (APTES). The process used in this experiment is a grafting process, where silica goes through a reflux process with solvents and APTES so that the amine groups attach to the surface of the modified silica. The results of the experiment is analysed using TGA and FTIR, and shows that the most optimal addition volume of APTES is 5 mL with the best types of solvents being ethanol and toluene solvents with the amount of amine loading contained in the modified silica being 1,9430 and 5,2552 mmol g aminopropyl/gram silica, respectively, but not in water solvents. The results of this study shows a successful APTES grafting of modified silica which can be used as an adsorbent for CO2 capture.
Identification of FAME (Fatty Acid Methyl Esters) Products from the Interesterification Reaction of Palm Oil with Methyl Ester Co-solvent Elvianto Dwi Daryono; Dwi Ana Anggorowati
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.8243

Abstract

Methyl ester co-solvent will accelerate the reaction without the need for a separation stage at the end of the reaction. The study aims to determine the effect of FAME co-solvent concentration and time of reaction on the methyl ester produced in the interesterification reaction of palm oil into biodiesel with methyl ester co-solvent. The weight of the oil used was 250 g, the mole ratio of oil: methyl acetate = 1:6, the temperature was 60oC, the concentration of the co-solvent (0 - 20%), the reaction time (30-90 min), the catalyst KOH 1% and the stirring speed was 800 rpm. The oil, methyl acetate and catalyst were placed in a three-necked flask and the reaction was carried out according to the operating conditions. The optimum conditions were obtained in the palm oil interesterification process with a FAME co-solvent concentration of 20% and a time of reaction of 30 min with  a methyl ester concentration of 61,413 mg/L and an acid value of 0.28 mg KOH/g which met SNI 7182-2015. The research revealed a biodiesel production process with fewer steps, faster reaction times, higher yields, and product physical properties that meet standards. It is hoped that this process can be implemented at a pilot plant scale, bringing the selling price of biodiesel closer to that of diesel fuel.
Characterization of Cassava Starch–Based Edible Film (Manihot esculenta) and Seaweed Na-Alginate with Variations in Drying Time Trustha Aurora Firdauza; Widia Kristiana Putri; Harimbi Setyawati; Dwi Ana Anggorowati
G-Tech: Jurnal Teknologi Terapan Vol 10 No 1 (2026): G-Tech, Vol. 10 No. 1 January 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i1.8959

Abstract

Edible films are biodegradable and consumable packaging materials that protect food products from environmental influences. This study aimed to produce and characterize cassava starch–based edible films with sodium alginate from seaweed, glycerol as a plasticizer, and garlic extract as an antibacterial agent using the solvent casting method. The research variables included cassava starch mass (4, 5, and 6 g) and drying time (4, 9, 14, 19, and 24 hours). Film thickness, tensile strength, elongation, moisture content, solubility, and microbiological properties were analyzed. Results showed that starch mass and drying time significantly affected the physical and mechanical properties of the films. The optimum drying time was 14 hours, at which all samples met the Indonesian National Standard (SNI) for moisture content (10–<16%). The best performance was obtained with 6 g starch, producing films with a tensile strength of 5.034 MPa, elongation of 13.48%, and low microbial counts (4–9 cells/100 mL) with negative Escherichia coli, complying with SNI 2897:2008. The addition of garlic extract contributed to the films’ antimicrobial properties. Overall, the formulation demonstrates a balanced combination of mechanical, physical, and microbiological characteristics, providing a practical foundation for developing biodegradable cassava starch–based edible films for food packaging applications.
Co-Authors Dominica Edora Stella Raharjanto Elvianto Dwi Daryono Harimbi Setyawati Nanik Astuti Rahman Trustha Aurora Firdauza Widia Kristiana Putri