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

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Extraction of Pacitan Sweet Orange Peel Pectin as a Bioadsorbent on the Adsorption Process of Fe Metal in FeCl3 Solution Nadhifatuz Zalfa Nur Aisyah; Camelia Asiah Putri Anwar; Nurul Widji Triana
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.v9i3.7085

Abstract

One alternative to treating waste that contains heavy metals is by bioadsorption process from natural materials as adsorbents. In this study, Pacitan sweet orange peel raw material was used as a FeCl3 metal bioadsorbent. This study aims to obtain pectin as a bioadsorbent for Fe metal in FeCl3 solution with the influence of extraction time and temperature on pectin extraction. In this study, pectin was extracted using the direct extraction method with HCl solvent. To prove the characteristics of pectin, FTIR analysis was conducted by observing the C=O group contained in pectin. Atomic Adsorption Spectrophotometer (AAS) analysis was then used to perform pectin adsorption in a FeCl3 solution. The research results show that optimum conditions are achieved at a temperature of 80°C, a contact time of 90 minutes with the addition of a pectin mass of 90 mg obtained an adsorption efficiency of 60.52%. From the isotherm adsorption analysis, Freundlich isotherm was applied to the adsorption of FeCl3 metal with a determination coefficient (R2) of 0.968.
Reduction of Cu and Cr Metal Content in Electroplating Industrial Liquid Waste Using the Ion Exchange Method Tsabitah Nabilah Khairunnisa; Yesi Nabila Zahro Herazi; Rachmad Ramadhan Yogaswara; Mu’tasim Billah; Nurul Widji Triana
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.v9i3.7374

Abstract

Electroplating industrial waste contains toxic chemicals that pose risks to health and environment, especially if they enter household wastewater systems. Therefore, treatment is necessary to reduce heavy metal content using the ion exchange method. This study utilized Amberlite IR 120Na resin as the ion exchange medium in electroplating waste. This study aims to reduce metal content in electroplating industrial wastewater using the ion exchange method by evaluating the effects of resin height and flow rate. The process was conducted with variations in flow rate (100 ml/min, 200 ml/min, 300 ml/min, 400 ml/min, 500 ml/min) and resin height (3 cm, 6 cm, 9 cm, 12 cm, 15 cm). The waste was passed through the ion exchange column, and the remaining Cu and Cr metal concentrations were measured. The results indicated that the optimal conditions occurred at a flow rate of 100 ml/min and a resin height of 15 cm, achieving a reduction of Cu metal by 90.16% and Cr metal by 83.36%. The Cu concentration after the process met quality standards under all conditions, while the Cr concentration met quality standards at resin heights of 12 cm and 15 cm. The ion exchange method proved effective in reducing heavy metal pollution.
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 Camelia Asiah Putri Anwar Fidela Lathifa Haryati Mu’tasim Billah Nadhifatuz Zalfa Nur Aisyah Puspa Prima Andini Rachmad Ramadhan Yogaswara Suprihatin Suprihatin Susilowati Susilowati Tsabitah Nabilah Khairunnisa Yesi Nabila Zahro Herazi