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All Journal EKSAKTA: Journal of Sciences and Data Analysis SMARTek Foristek CHEMISTRY PROGRESS IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Jurnal Dinamika Pengabdian (JDP) Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Gema Ngabdi ARIKA Molluca Journal of Chemistry Education (MJoCE) BIOEDUPAT: Pattimura Journal of Biology and Learning Jurnal Ilmiah Berkala Sains dan Terapan Kimia Makara Journal of Science Molekul: Jurnal Ilmiah Kimia BAKIRA: Jurnal Pengabdian Kepada Masyarakat Innovation for Community Service Journal Jurnal Abdimas Multidisiplin Jurnal Analis Kesehatan Kendari International Journal of Acta Material
I W. Sutapa
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kendari, Indonesia.
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences Other

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Application of Rice Husk Silica Ash Activated using NH4OH to Reduce Calcium Ion (Ca2+) Levels in Brackish Water L. Harimu; Mutmainnah; Dahlan; W. O. Mulyana; E. C. Mandasar; I W. Sutapa; A. Kamari
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.21

Abstract

A study was conducted to investigate the efficacy of NH4OH-activated rice husk ash silica in mitigating calcium ion (Ca²⁺) concentrations in brackish water. The primary objective of this research was to evaluate the adsorption capacity of NH4OH-activated rice husk ash silica for Ca²⁺ ions dissolved in brackish water. The experimental methodology employed various adsorption parameters, including pH levels (5, 6, 7, 7.5, 8, 9), adsorbent masses (0.01, 0.025, 0.05, 0.1, 0.2 g), contact times (15, 30, 45, 60, 75 minutes), and concentration levels (25, 50, 75, 100 ppm) for Ca²⁺ ions. The findings indicated that optimal adsorption occurred at an adsorbent mass of 0.025 grams, a pH of 7.5, a contact time of 30 minutes, and a concentration of 50 ppm, resulting in an adsorption capacity of 67.2 mg/g. Furthermore, under optimal conditions, the application of activated rice husk ash silica as an adsorbent in brackish water demonstrated an NH4OH adsorption capacity of 40 mg/g, with a brackish water concentration of 40 mg/g. Therefore, it can be concluded that NH4OH-activated rice husk ash silica is a viable adsorbent for reducing calcium ion (Ca²⁺) levels in brackish water.
Cobalt Distribution in Ultramafic Laterite Profiles: Integration of Morphology, Drilling Data, and Geochemistry, in North Konawe Regency A. Okto; Hasria; A. A. W. Aqdi; I W. Sutapa
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.22

Abstract

The research location is located in the Wiwirano area, North Konawe Regency, Southeast Sulawesi Province. The stratigraphic arrangement is based on the regional geology of the Lasusua-Kendari sheet, the study site is dominated by the Ultramafic Complex with hilly morphology. This research was conducted by analyzing drilling data in the form of drilling logging descriptions and XRF geochemical analysis data in 11 drill holes with elements of Ni, Fe, Co, and Mn which aims to determine the presence of cobalt in the laterite profile which is visualized in the form of drill hole logs and variations in nickel thickness. Elevation and type of topography affect the cobalt content contained where the highest cobalt content is at an altitude of 437 meters above sea level (hills) with rather steep slopes. The bedrock that composes the study area consists of dunit where olivine is the main Co element carrier associated with geothite and manganese elements. The element cobalt is richest in the top soil zone to the limonite zone and the element cobalt in the study area also has a strong positive relationship with the elements MnO, Cr2O3 and Fe. The element of cobalt in the study area increased with the presence of geothite and manganese wood minerals and was inversely proportional to the presence of silica minerals.
Physicochemical Characterization of Indonesian Natural Clay from Hutumuri, Ambon City, Indonesia as a Low-Cost Porous Material H. Tehubijuluw; E. K. Huliselan; R. Subagyo; R. E. Nugraha; A. A. Jalil; I. W. Sutapa; Rahayu; D. Sri; N.F. Jaafar
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.31

Abstract

Natural clays are widely explored as low-cost and sustainable alternatives to synthetic porous materials due to their abundance, structural versatility, and potential for environmental applications. In this study, natural zeolite obtained from Hutumuri Village, Ambon, Indonesia, referred to as Hutumuri Natural Clay (HNC), was prepared and characterized to evaluate its physicochemical properties. The raw material underwent purification, particle size reduction (<2 µm), and chemical activation using hydrochloric acid. Comprehensive characterization was carried out using X-ray fluorescence (XRF), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) surface area analysis. The results revealed that HNC contains high levels of SiO2 and Al2O3, with a Si/Al ratio of 1.1, classifying it as a low-silica zeolite. XRD analysis confirmed quartz as the dominant phase, while FTIR and EDX results supported the presence of silicate, aluminate, and ferrite species. BET analysis showed a surface area of 86.002 m2/g with an average pore diameter of 7.032 nm, indicating mesoporous characteristics. These properties suggest that HNC is a promising candidate for applications in adsorption, catalysis, and other environmental remediation processes.
Co-Authors . Mohtar A Netty Siahaya A. A. Jalil A. A. W. Aqdi A. Bandjar A. H. Kasim A. Kamari A. Kamari A. Kamari A. Okto A.N. Zahra Abdul Wahid Wahab Adelin, La Adriani Bandjar Alwahab Alwahab Angga Febrian Astawa, Ida Nyoman Bandjar, A. Bandjar, Adriani Bijang, Catherina Manukpadang C. Baskar C. Baskar Catherina M. Bijang Chaterina Bijang D. Sri Dahlan Desy Kamanasa Dewi, Nyoman Diah Utari Dominggus Male E. C. Mandasar E. K. Huliselan Fajri Fitra Amalia Fensia Analda Souhoka Fransina, Eirene G. Gaspersz, Nelson H. Natsir H. Tehubijuluw H. Tehubijuluw Harniati P Rego Hasanela, Nurani Hasria Hehanussa, Susan Hellna Tehubijuluw Hellna Tehubijuluw Hikmayani I Nyoman Sudiana I. S. Ely Imran Imran Jolantje Latupeirissa Kamanasa, Desy Kapelle, Imanuel B. D. Karna Wijaya Karna Wijaya L. Agusu L. Ahmad L. Harimu L. Lestari L. O. A. N. Ramadhan L. O. Ahmad L. O. Kadidae L. O. M. Salam La Agusu Latupeirissa, Jolantje M. Z. Muzakkar Maahury, Mirella Fonda Mahulau, Nurlina Maryantho Masarrang Matheis F.J.D.P. Tanasale Mealan Lethulur Mirella Fonda Maahury Muhamad Jamal Mutmainnah N. A. Pratiwi N.F. Jaafar Nariskawati Nasution, Annio Indah Lestari Nohong Nohong Nursiah La Nafie P. Taba Pattiasina, Priska Marisa Paulina Taba Polansky Patty Priska Marisa Pattiasina Priska Marissa Pattiasina Pusung, Yulian A. D. R, Irwan R. Ananda R. E. Nugraha R. Subagyo Rahayu Rahayu Ranglalin, Olivia M. Ria Armunanto Ria Armunanto Rosmawaty Harahap Rosmawaty Rosmawaty Ruslin Hadanu S. Fauziah S. Kasim S. Liong S. Mitsudo S. Raharjo Sahidin Sahidin Sahidin Salim Idris Samual, Ismah Sapulete, Sisca Madona Semuel Simra Pada Sherly J. Sekewael Siahay, Victor P.D. Sohilait, Mario Rowan Sriyanti, Gusti Ayu Komang Syahrir T. Asano Thamrin Azis THAMRIN AZIS Topurtawy, Ronald R. W. O. Mulyana W. O. N. Haryanti W. O. Nurtia W. Riskiyani Wiyasa, I Ketut Y. Fujii Y. Ishikawa Y. Tatematsu Yodha, Agung Wibawa Mahatva Yuli Asmi Rahman Yusthinus T. Male Yusthinus Thobias Male Zainal Syam Arifin