Thermodynamics and kinetic studies of methyl orange dye adsorption in magnetic material-silica-zeolite (MM-Sio2-NZ) composite

Alrum  Armid; Fahmiati Fahmiati; Halimahtussaddiyah  Ritonga; Darwin  Ismail; La Ode Ahmad Nur  Ramadhan

doi:10.29303/aca.v6i2.159

Methyl orange (MO) dye waste in the aquatic system has become an interesting issue that has been governed by increasing dye industrial practices. Treatment of dye wastes by adsorption has become an efficient method to overcome dye pollution, including MO. In recent years, magnetic materials have been used as adsorbents, however, there is a shortage to use for a long period of time. The present study investigated on a laboratory scale the ability of iron sand magnetic material-silica-zeolite (MM-SiO2-NZ) as an adsorbent of MO dye in order to distinguish their adsorption characteristics.

Thermodynamics and kinetic studies of methyl orange dye adsorption in magnetic material-silica-zeolite (MM-Sio2-NZ) composite

Authors

Alrum Armid , Fahmiati Fahmiati , Halimahtussaddiyah Ritonga , Darwin Ismail , La Ode Ahmad Nur Ramadhan

DOI:

10.29303/aca.v6i2.159

Published:

2022-05-10

Issue:

Vol. 6 No. 2 (2023)

Keywords:

adsorption, methyl orange, magnetic material, silica, zeolite

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Armid, A., Fahmiati, F., Ritonga, H., Ismail, D. ., & Ramadhan, L. O. A. N. . (2022). Thermodynamics and kinetic studies of methyl orange dye adsorption in magnetic material-silica-zeolite (MM-Sio2-NZ) composite. Acta Chimica Asiana, 6(2), 301–308. https://doi.org/10.29303/aca.v6i2.159

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Abstract

Using methyl orange (MO) in dye industries can cause the accumulation of MO waste in aquatic systems, including seawater. A magnetic material-silica-zeolite (MM-SiO2-NZ) composite was investigated in vitro to adsorb methyl orange (MO) dye. MM-SiO2-NZ composite was characterized using FTIR, XRF, and VSM. Adsorption studies with pH, concentration, contact time, and temperature variations were carried out to determine the adsorption capacity. The MM-SiO2-NZ characterization results by FTIR showed the presence of OH groups from Fe-OH, Si-OH, and Al-OH, and there were Fe-O, Si-O, Al-O, Si-O-Si, and Si-O-Fe groups. The results of XRF characterization showed that the metal oxide content of Fe2O3 in magnetic material (MM) was 75.39% and decreased to 52.63% after the MM-SiO2-NZ composite was formed. The characterization using VSM indicated the magnetic properties of MM to be 44.083 emu/g, then decreased to 11.407 emu/g after being composited. The adsorption of MM-SiO2-NZ tends to follow the Langmuir adsorption isotherm with a Langmuir constant (KL) value of 1.332 L/mg. Furthermore, the adsorption kinetics followed the pseudo-second-order kinetics with a constant value (k2) of 3×10-2 g.mg/min. MO dye adsorption by MM-SiO2-NZ took place spontaneously with Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) values of -1.109 kJ/mol, -38.687 kJ/mol, and -12.402 kJ/mol, respectively.

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Thermodynamics and kinetic studies of methyl orange dye adsorption in magnetic material-silica-zeolite (MM-Sio2-NZ) composite

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