Khoiroh, Lilik Miftahul 
ORCID: https://orcid.org/0000-0001-6634-6571, Widiastuti, Nurul Widiastuti, Puri, Ananda Anggelita Aprina, Gunawan, Triyanda and Purwanto, Moch
(2026)
The adsorptive power of Nylon–Gelatin–Hematite composite: Study on NaCl solution adsorption through Equilibrium, Kinetic, and Thermodynamic approach.
Presented at SRCM 2025, Desember, Surabaya.
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Abstract
The development of composite adsorbent materials is a promising strategy for saline water
treatment. In this study, a nylon–gelatin–hematite composite with a porous structure was investigated
for NaCl ion removal. The porous matrix and functional groups on the polymer and hematite surfaces
facilitated Na⁺ and Cl⁻ adsorption through electrostatic interactions and surface adsorption
mechanisms. Adsorption performance was evaluated using a batch method with variations in adsorbent
dosage, contact time, and temperature. Functional groups were confirmed by Fourier-transform
infrared (FTIR) spectroscopy. Adsorption performance was evaluated through measurements of
salinity, total dissolved solids, and electrical conductivity. The adsorption behavior was examined
through equilibrium, kinetic, and thermodynamic analyses to elucidate the underlying mechanism and
efficiency. The FTIR spectra confirmed characteristic vibrations of nylon, gelatin, and hematite,
indicating the successful formation of the composite. Equilibrium data fitted well with the Freundlich
isotherm models (R² > 0.99) at dosage variation, suggesting favorable multilayer adsorption on
heterogeneous surfaces. The maximum adsorption capacity qmax reached 1.626 mg/g. Kinetic studies
revealed that the adsorption process followed a pseudo-first-order model, indicating a dominant
physisorption mechanism. Negative Gibbs free energy values (ΔG = -1.905 to -2.139 kJ/mol)
confirmed the spontaneous adsorption process.
| Item Type: | Conference (Paper) |
|---|---|
| Keywords: | adsorption, NaCl, Isoterm Langmuir, Isoterm Freundlinch |
| Subjects: | 03 CHEMICAL SCIENCES > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry) |
| Divisions: | Faculty of Mathematics and Sciences > Department of Chemistry |
| Depositing User: | lilik miftahul khoiroh |
| Date Deposited: | 10 Jul 2026 14:26 |
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