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All Journal Jurnal Katalisator Jurnal Akademika Kimia
Adewirli Putra
Syedza Saintika University
Agriculture, Biological Sciences & Forestry Chemistry Education

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Duck Eggshell Biosorbent for Indigo Carmine Removal: Kinetic, Isotherm, and Adsorption Mechanism Studies Adewirli Putra; Wiya E. Fitri; Deswati Deswati; Desy Kurniawati; Lia Anggresani; Corry Handayani; Aster Rahayu
Jurnal Akademika Kimia Vol. 15 No. 2 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i2.pp129-141

Abstract

Synthetic dye contamination from medical laboratory wastewater poses a growing environmental challenge, particularly from compounds such as indigo carmine, which are toxic, biologically recalcitrant, and detrimental to aquatic life. This research investigated duck eggshell as an eco-friendly, low-cost biosorbent for eliminating indigo carmine from medical laboratory effluents. The biosorbent was prepared by washing, oven-drying, grinding, and mild acid activation with 0.01 N HNO₃. Batch experiments were carried out by varying both the contact duration (15–60 min) and the initial dye concentration (10–50 mg/L), with residual concentrations determined using UV-Vis spectrophotometry. Adsorption kinetics were modeled using pseudo-first-order and pseudo-second-order equations, while equilibrium data were fitted to Langmuir and Freundlich isotherms. Peak adsorption capacity reached 8.20 mg/g within just 15 minutes of contact. The pseudo-second-order model gave the superior fit (R² = 0.9989), reflecting that surface-mediated interactions govern the process, though diffusion contributions cannot be excluded. Under optimal conditions, dye removal reached 67.80%, demonstrating efficient and rapid uptake. The Freundlich isotherm provided the best fit to the equilibrium data (R² = 0.9735), indicating multilayer uptake on an energetically heterogeneous surface. Overall, duck eggshell proved to be a practical, cost-effective, and sustainable material for removing dye pollutants from wastewater in the medical sector.
Evaluation of Acid Mine Drainage Neutralization Using CaO and Alum Ridho Yovanda; Audrey Faiza Rosa; Finny Marsyah; Wiya Elsa Fitri; Adewirli Putra
JURNAL KATALISATOR Vol. 11 No. 1 (2026): Jurnal Katalisator, Volume 11 No 1 April 2026
Publisher : LLDIKTI X Sumbar, Riau, Jambi, Kepri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62769/katalisator.v11i1.3538

Abstract

Acid mine drainage (AMD) is a major environmental issue associated with coal mining activities, characterized by low pH and elevated concentrations of dissolved metals that can degrade water quality and harm aquatic ecosystems. Active treatment using alkaline materials such as quicklime (CaO) combined with coagulants like alum is widely applied to neutralize acidity and reduce metal content. This study aims to evaluate the effectiveness of CaO and alum in improving the pH of acid mine drainage. The research was conducted through a combination of field testing and laboratory analysis. The treatment process involved dosing quicklime and alum into acid mine drainage, followed by periodic pH measurements at inlet and outlet points over a one-month observation period. Data were analyzed using linear regression to determine the relationship between CaO dosage and pH changes. The results showed that the initial pH of acid mine drainage remained acidic, with an average value of 4.43, and increased slightly within the range of 4.43 to 4.76 after treatment. Regression analysis indicated a strong correlation (R² = 0.9537) between CaO dosage and pH increase, suggesting that higher dosages contribute to improved neutralization performance. However, the achieved pH values have not yet met the environmental quality standard (pH ≥ 6), indicating that further optimization of treatment dosage and process conditions is required. These findings highlight that while the combination of CaO and alum has potential in neutralizing acid mine drainage, its current application is not yet sufficient to achieve regulatory compliance and improvements in treatment design are necessary.
Co-Authors Audrey Faiza Rosa Corry Handayani Deswati Deswati Desy Kurniawati Finny Marsyah Lia Anggresani Rahayu, Aster Ridho Yovanda Wiya E. Fitri Wiya Elsa Fitri