Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Jurnal Ilmiah Teknik Kimia
Oki Alfernando
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Chemistry

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Pemanfaatan Limbah Ampas Kopi sebagai Adsorben untuk Pengolahan Air Limbah Industri Tahu: Analisis Adsorpsi Batch dan Parameter Isoterm Rara Ayu Lestary; Oki Alfernando; Sarah Fiebrina Heraningsih; Rosmawati Sipayung; Adelia Amanda; Alya Rizki Amelia; Ita Safitri; Septrinawati Tambunan; Tiamsa Sihotang; Karisma Ulfadeli; Tiara Bartisa Putri
Jurnal Ilmiah Teknik Kimia Vol. 9 No. 2 (2025): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jitk.v9i2.48776

Abstract

Coffee grounds waste can be utilized as a cost-effective and eco-friendly adsorbent for treating wastewater from the tofu industry. Batch adsorption experiments were conducted to evaluate the performance of coffee grounds as an adsorbent in removing pollutants from tofu wastewater. Different adsorbent doses (1 g, 2 g, and 3 g per 200 mL) were tested, and the quality of the wastewater was assessed based on changes in Total Dissolved Solids (TDS), turbidity, conductivity, and pH. The specific adsorption capacity (mg/g) and removal efficiency (%) decreased with increasing adsorbent dose. The overall removal of contaminants was most effective at a 3 g dose, resulting in a 47% reduction in TDS and an 80% decrease in turbidity. Adsorption equilibrium data were further analyzed using Langmuir, Freundlich, and Temkin isotherm models. The Langmuir model showed the best fit (R² = 0.999), indicating monolayer adsorption on a homogeneous surface. These results demonstrate that coffee grounds waste is a promising sustainable adsorbent, particularly for small and medium-scale tofu industries with limited resources for wastewater treatment.
Transformation of Agricultural Waste into Silica–Cellulose Microsponge Adsorbent for Optimization of Waste Cooking Oil as Biodiesel Feedstock Sipayung, Rosmawati; Rahma Amalia; Rara Ayu Lestary; Nita Widyastuti; Oki Alfernando; Ira Galih Prabasari; Nazarudin; Putri Ananda; Intan Nandia Sakti
Jurnal Ilmiah Teknik Kimia Vol. 10 No. 1 (2026): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jitk.v10i1.54342

Abstract

The utilization of used cooking oil as a biodiesel feedstock is hindered by its high free fatty acid (FFA) content, which interferes with the transesterification process. This study aims to reduce FFA levels through adsorption using a silica–cellulose-based microsponge adsorbent synthesized from rice husk ash and corn cob waste. The investigated process variables include adsorbent mass (1, 3, 5 g), temperature (30, 45, 60 °C), contact time (30, 60, 90 minutes), and silica-to-cellulose ratios (40:60, 50:50, 60:40). FTIR analysis revealed characteristic peaks of Si–O–Si (~1053 cm⁻¹) and Si–O (~795 cm⁻¹) indicating the presence of amorphous silica, while the O–H stretching (~3200–3500 cm⁻¹) of cellulose appeared weaker due to silica dominance on the surface. This confirms the successful formation of the silica–cellulose composite with strong chemical interaction. Furthermore, Brunauer–Emmett–Teller (BET) analysis showed a specific surface area of 87.77 m²/g with mesoporous characteristics, confirming the microsponge structure with high affinity toward polar molecules such as FFA. The optimum conditions were obtained at 5 g adsorbent mass, 30 °C, 60 minutes contact time, and a 60:40 silica-to-cellulose ratio, achieving an FFA reduction efficiency of 49.62%. These physicochemical properties make the adsorbent efficient, energy-saving, and environmentally friendly, highlighting the great potential of agricultural waste transformation into active materials for pre-purification of used cooking oil toward sustainable biodiesel production.
Co-Authors Adelia Amanda Alya Rizki Amelia Intan Nandia Sakti Ira Galih Prabasari Ita Safitri Karisma Ulfadeli Nazarudin Nita Widyastuti Putri Ananda Rahma Amalia Rara Ayu Lestary Rosmawati Sipayung Sarah Fiebrina Heraningsih Septrinawati Tambunan Tiamsa Sihotang Tiara Bartisa Putri