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All Journal G-Tech : Jurnal Teknologi Terapan
Suprihatin Suprihatin
Universitas Pembangunan Nasional “Veteran” Jawa Timur, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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Study of Crystallization Process of Potassium Chloride (KCl) Solution with Ethanol Solution Selvia Sofi Yanti; Muhimatur Rosida; Ketut Sumada; Caecilia Pujiastuti; Suprihatin Suprihatin
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5628

Abstract

This study develops a method for producing KCl fertilizer from KCl waste generated during the industrial production of calcium oxide, with KCl concentrations in the wastewater ranging from 7-10%. The main objective of this research was to investigate the effect of ethanol concentration and crystallization time on pore diameter, KCl content, and the amount of product produced. The study was conducted in two stages: evaporation and crystallization. In the evaporation stage, the KCl waste was heated until it reached a saturated solution. In the crystallization stage, ethanol solution was added as an antisolvent to accelerate the crystallization process.KCl analysis results showed that increasing ethanol concentration and crystallization time led to higher K and Cl content in the final product. The highest K content was 79.55%, and the highest Cl content was 16.88%, achieved with 90% ethanol concentration and a crystallization time of 100 minutes. BET analysis indicated that as ethanol concentration increased, the resulting product size grew larger, leading to smaller pore diameters. At high ethanol concentrations, the KCl crystals formed lacked pores. SEM-EDX analysis revealed that the KCl crystals not only contained K and Cl but also other elements such as C, O, and Ca.
Study of Hydroxyapatite from White Mussel Shells Using Nitric Acid Solvent with the Sol-Gel Method Alia Febrianti Muliina; Nana Roudlotul Fitri; Suprihatin Suprihatin
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.v9i3.7436

Abstract

Mussel shells contain high calcium levels, making them suitable for hydroxyapatite (HAp) synthesis. HAp is a bioceramic widely applied in bone implant materials. This study synthesized HAp from white mussel shells (Corbula faba Hinds) using nitric acid via the sol-gel method. The effects of pH (8–12) and stirring temperature (30°C–90°C) on product yield and crystallinity were evaluated. X-ray fluorescence (XRF) was used to analyze elemental composition, while X-ray diffraction (XRD) characterized the crystalline phase. Results showed that increasing pH and temperature generally enhanced both yield and crystallinity. Optimal conditions were observed at pH 10 and higher temperatures, demonstrating the effective conversion of mussel shells into hydroxyapatite. These findings support the potential of marine biowaste as a sustainable raw material for biomedical applications.
Processing of Rice Husk into Bleaching Earth Using the Precipitation Method for Adsorption of Colorants in Palm Oil Fidela Lathifa Haryati; Puspa Prima Andini; Nurul Widji Triana; Susilowati Susilowati; Suprihatin Suprihatin
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.v9i4.8024

Abstract

Rice husk waste from rice milling in Indonesia contains high silica, making it a promising raw material for adsorbent synthesis. This research contributes to sustainable waste utilization and supports green technology in palm oil refining, providing both environmental and industrial significance. This study focuses on producing Bleaching Earth from rice husk using the precipitation method and applying it to adsorb colorants in used cooking oil. Rice husk ash (RHA) was reacted with sodium hydroxide (NaOH) to form sodium silicate, which was then precipitated using sodium aluminate (NaAlO₂) and hydrochloric acid (HCl) to obtain silica gel. The process variables were the volume of NaAlO₂ solution (15–35 mL) and stirring time (10–50 minutes). The synthesized Bleaching Earth was analyzed for moisture content, pH, chemical composition (XRF), and surface properties (BET). The best Bleaching Earth met the Indonesian National Standard (SNI 136336-2000), with a moisture content of 2.48–6.01%, neutral pH (~7), and mesoporous structure with pore diameters of 6,49–13.87 nm. The optimal adsorption performance occurred at a pore diameter of 11–12 nm, achieved using 25 mL NaAlO₂ with 50 minutes of stirring or 35 mL NaAlO₂ with 40 minutes of stirring. Application of this BE effectively reduced the color intensity of used cooking oil, producing lighter and clearer oil, confirming rice husk’s potential as an eco-friendly, low-cost source for Bleaching Earth production.
Co-Authors Alia Febrianti Muliina Caecilia Pujiastuti Fidela Lathifa Haryati Ketut Sumada Muhimatur Rosida Nana Roudlotul Fitri Nurul Widji Triana Puspa Prima Andini Selvia Sofi Yanti Susilowati Susilowati