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All Journal Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Jurnal SOLMA Eksakta : Berkala Ilmiah Bidang MIPA Sainstek : Jurnal Sains dan Teknologi Indonesian Journal of Chemical Science and Technology Jurnal Wawasan Pendidikan
Zubir, Moondra
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Other

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Exploring the Redox Reaction Potential of Local Fruits: Galvani Cell Trials Based on Areca nut (Areca catechu), Rimbang (Solanum torvum), and Bangkok starfruit (Averrhoa carambola) Fahmi, Jaman; Ramadhan, Dwi Sapri; Wardana, Dian; Safitri, Wulan Dwi; Mendrofa, Bulan Susanti; Br Nadeak, Stephani Bintang N.; ayumi, Sheilla Maliza; Nasution, Dhea Ananda; Zubir, Moondra; S, Abd Hakim
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68731

Abstract

This research aims to explore the potential of three fruits, such as areca nut (Areca catechu), rimbang (Solanum torvum), and star fruit (Averrhoa carambola), as a natural electrolyte source in generating electricity through a simple Galvani cell test. The research method includes making Galvani cells using fruit pieces as electrolyte media, measuring the voltage and current produced, and testing the ability to light an LED as an indicator of electrical output. The measurement results showed that areca nuts produced the highest voltage and current compared to rimbang and star fruit, demonstrating its effectiveness as a natural electrolyte. This finding indicates that local fruits have the potential to be an environmentally friendly electrochemical energy source material that can be applied in education and simple technology. This research opens opportunities for further development in utilizing local biological resources for electrochemical applications.
Sustainable Candle Production from Waste Cooking Oil and Waste Lubricating Oil Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jaman; Safitri, Wulan Dwi; Damanik, Wicha Rosari; Simamora, Astuty Evalina; Sigalingging, Olivia Gina Ananta; Manullang, Okto Panca; Rahmadyani, Zaskia; Zubir, Moondra; S, Abd Hakim
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68733

Abstract

This study investigates the potential utilization of waste cooking oil and used lubricant oil as raw materials for candle production. These waste materials, often regarded as environmental pollutants, contain fats and hydrocarbons that can be converted into value-added products. The manufacturing process involved filtration, heating, and the incorporation of additives such as paraffin wax to enhance quality and stability, followed by molding. The resulting candles demonstrated acceptable physical properties, including melting points and burning times comparable to standard requirements. However, noticeable differences in color and odor were observed when compared to commercial candles. Despite these limitations, the valorization of waste cooking oil and used lubricant oil presents an environmentally friendly and cost-effective alternative, contributing to the development of sustainable products. Further research is recommended to optimize the blending ratios and additive compositions in order to improve the overall performance of the candles
Kinetics and Equilibrium Properties of Fe(II) Adsorption Using Modified Empty Palm Oil Bunches Activated Carbon Khairahma; Ramadhan, Dwi Sapri; Faradilla, Putri; Rahmah, Siti; Selly, Rini; Jasmidi; Zubir, Moondra
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68743

Abstract

The increasing palm oil production in Indonesia contributes to higher agricultural waste, particularly Empty Fruit Bunches (EFB). This waste can be processed into activated carbon as an adsorbent to remove Fe(II) ions from Palm Oil Mill Effluent (POME). This study reviews two EFB-based adsorbents: Fe-Cu modified activated carbon and a composite of activated carbon with Copper-TAC Metal Organic Frameworks (Cu(TAC)₂). Adsorption kinetics data show that the pseudo-second-order model fits best, with the highest regression coefficient (R² = 0.99637) found in the Cu(TAC)₂ composite, indicating a chemisorption mechanism. Adsorption equilibrium analysis using Freundlich isotherm revealed that while all materials fit the model, plain activated carbon had an unfavorable 1/n value (>1), suggesting weak interaction between adsorbent and adsorbate. Based on kinetic and isotherm analysis, the Cu(TAC)₂ composite was more effective for Fe(II) adsorption than Fe-Cu or unmodified activated carbon.
Effectiveness of Modified Empty Palm Oil Bunch-Based Activated Carbon for Reducing Ammonia Content in Palm Oil Wastewater Khairahmi; Ramadhan, Dwi Sapri; Faradilla, Putri; Rahmah, Siti; Selly, Rini; Jasmidi; Zubir, Moondra
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68746

Abstract

Indonesia, particularly North Sumatra, is a major producer of palm oil, generating significant waste such as empty fruit bunches (EFB) and ammonia-rich wastewater. Ammonia pollution poses serious environmental risks if not treated properly. This study explores the potential of three types of adsorbents—Fe-Cu modified activated carbon, AC-Cu(TAC)₂ composite, and unmodified activated carbon—for ammonia adsorption. Activated carbon was synthesized from EFB and further modified using Fe-Cu and Cu(TAC)₂. Adsorption experiments were conducted with variations in adsorbent mass, contact time, and NH₄OH concentration. The results showed that Fe-Cu modified activated carbon had the highest ammonia removal efficiency (90%), while the AC-Cu(TAC)₂ composite had the highest adsorption capacity. Equilibrium analysis revealed that the AC-Cu(TAC)₂ composite fit both Langmuir and Freundlich isotherm models (R² = 1), suggesting both monolayer and heterogeneous adsorption. The unmodified activated carbon followed the Langmuir model (R² = 0.9498), while Fe-Cu modified activated carbon did not fit either model. Kinetic studies indicated that Fe-Cu modified activated carbon followed a pseudo-first-order model (R² = 0.9936), implying physisorption, whereas both AC-Cu(TAC)₂ and unmodified activated carbon followed pseudo-second-order models (R² = 0.9779 and 0.9869), indicating chemisorption. These findings highlight the promising potential of modified EFB-based adsorbents for ammonia removal in wastewater treatment applications.
Co-Authors AA Sudharmawan, AA Abd Hakim, Abd Agus, Junaidi Arayan, Miftah Arwadi Sinuraya Aulia, Amanda Aulia, Shelly ayumi, Sheilla Maliza Azizah, Rifka Noor Azzahra, Nabila Batubara, Diva Angelica Amanda Br Manik, Trivena Myta Br Nadeak, Stephani Bintang N. Cahyati, Riska Damanik, Angelica Damanik, Wicha Rosari Dikki Miswanda Dion Awfa Fahmi, Jaman Faradilla, Putri Fitri, Indah Hamasaki, Atom Intan Juwita, Intan Jannah, Nazria Marwatul Jasmidi Jasmidi Jasmidi Kabul, Abdul Hamid Khairahma Khairahmi Khairunisa, Dira Manalu, Anrian Haholongan Manullang, Okto Panca Maulina, Rissah Mendrofa, Bulan Susanti Mustaqiman, Aulia Nur Nasution, Dhea Ananda Nasution, Hafni Indriati Ningsih, Liska Kustria Novrizaldi Wardana Ozeki, Sumio Panjaitan, Teguh Hidayat Prayogo, Wisnu Pulungan, Ahmad Shafwan purba, Gracia Purba, Nesya Maharani Putra, Adhitya Shahrian Rahmadyani, Zaskia Ramadhan, Dwi Sapri Riga, Riga Rini Selly, Rini S, Abd Hakim Safitri, Wulan Dwi Sari, Lidia Mutia Sari, Maya Novita Sari, Trisna Kumala Savika, Anggraini Selly, r Sembiring, Rahel Natalia Sembiring, Rinawati Siahaan, Stephani Yunita Sigalingging, Olivia Gina Ananta Simamora, Astuty Evalina Sitompul, Maysaro Suprapto Suprapto Syafirna, Nada Syahirah, Atikah Nur Tambunan, Ida Mariati Tanjung, Amar Lohot Wardana, Dian Yusfiani, Marnida Zainuddin Muchtar