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All Journal International Journal of Engineering, Science and Information Technology ANDIL Mulawarman Journal of Community Engagement
Fira, Aulia Almag
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Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Optimization of Used Cooking Oil Utilization through Aromatherapy Candle-Making Training: A Case Study in Lestari Jaya Hamlet, East Kutai, East Kalimantan: Optimalisasi Pemanfaatan Minyak Jelantah melalui Pelatihan Pembuatan Lilin Aromaterapi: Studi Kasus di Dusun Lestari Jaya, Kutai Timur, Kalimantan Timur Fira, Aulia Almag; Septyandy, Muhammad Rizqy; Cristin, Angelia; Manullang, Pedrico Partogi; Alfiani, Nadia Putri; Muftia
ANDIL Mulawarman Journal of Community Engagement Vol. 3 No. 1 (2026): ANDIL Mulawarman J Comm Engag
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LP2M), Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/andil.v3i1.3755

Abstract

Used cooking oil is a domestic waste frequently disposed of improperly, causing persistent pollution to water and soil. An aromatherapy candle-making training program based on recycled used cooking oil was conducted in Lestari Jaya Hamlet, Kutai Timur Regency, aiming to optimize waste utilization, reduce environmental contamination risk, and promote the development of creative, eco-friendly businesses within the community. The event engaged 16 participants from the PKK women's group and local residents through material presentations and hands-on practice. The success of the program was evaluated using a Likertscale questionnaire. Results revealed a mean satisfaction score of 4.4, indicating a high level of satisfaction with the training received. Financial analysis showed total monthly production costs of Rp6,569,038.89 for 1,000 candle units, with a selling price set at Rp8,500.00 per unit and a benefit-cost ratio (R/C) of 1.3, reflecting business feasibility and real profit potential. This initiative effectively enhanced environmental awareness, entrepreneurial skills, and motivated the community to manage domestic waste productively. The main recommendation is to replicate this training model in other areas and to integrate digital marketing strategies to foster sustainable development of micro-businesses based on waste materials.
Biosorption of Ni(II) Ions from Aqueous Solution Using Immobilised Cells of Bacillus cereus Khairunnisa, Khairunnisa; Nur, Ahmad Moh; Pisceselia, Dian Febrianti; Fira, Aulia Almag; Aldeani, Putri
International Journal of Engineering, Science and Information Technology Vol 5, No 4 (2025)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v5i4.1773

Abstract

In the present study, immobilised Bacillus cereus cells were used as a biosorbent for the removal of Ni2+ ions from aqueous solution. Bacillus cereus was immobilised with 3% sodium alginate and 2% CaCl2. The adsorption studies of bacteria were investigated in batch mode. Optimum biosorption conditions were determined as a function of pH, biosorbent dose, Ni2+ ion concentration, and contact time. The removal of Ni2+ ions increases with increased dose of biosorbent, while the adsorption capacity decreases with increasing dose of biosorbent. The equilibrium adsorption data were analysed using the Langmuir and the Freundlich isotherm models. The regression coefficient (R2) for the Langmuir isotherm was 0.9822 at a contact time of 60 minutes and pH 6. The maximum monolayer adsorption capacity (qe) of the biosorbent, as obtained from the Langmuir adsorption isotherm, was found to be 57.80 mg/g with the Langmuir adsorption constant ( 0,086 L/mg. RL values range from 0 to 1, as shown, supporting the previous observation that the Langmuir isotherm was favourable for Ni2+ ion adsorption. The adsorption kinetics were analysed using the pseudo-first-order and pseudo-second-order models. Kinetics of Adsorption followed pseudo-second order with a regression coefficient of pseudo-second order of  R2 0.98, the coefficient of rate constant for pseudo-second order () obtained 0.004 g/mg.min, pointing out that the adsorption mechanism is chemosorption or ion exchange. FTIR spectrum of biosorbent revealed the presence of OH, NH, C-H, C=O and COO-. SEM-EDX was used to analyse the surface morphology and texture of the biosorbent.
Co-Authors Aldeani, Putri Alfiani, Nadia Putri Cristin, Angelia Khairunnisa Khairunnisa Manullang, Pedrico Partogi Muftia Muhammad Rizqy Septyandy Nur, Ahmad Moh Pisceselia, Dian Febrianti