Silica Magnetite Adsorbent: Effect of Drying Temperature of Silica Sol Gel on Magnetite Core Structure

Azmiyawati, Choiril; Sawitri, Endang; Siahaan, Parsaoran

doi:10.14710/jksa.21.3.149-154

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Another published study states that the wavenumber is 1087.85 cm -1 for the Si-O-Si group. The wavenumbers of 462.92 cm ' 1 , 570.93 cm -1 ; 617.22 cm ' 1 and 671.23 cm show stretching vibrations of the Zn-0 groups [ 23 ]. Other studies have also stated that a strong Si02 spectrum indicates the presence of silica, including the symmetric bending of Si-O-Si at a wavenumber of 786 cm ' 1 and Si-O-H at 956 cm -1 .…”

Section: Synthesis Nanocomposite Si02 / Znomentioning

confidence: 90%

Synthesis and Characterization of SiO2/ZnO Nanocomposites from Zinc Waste and Mount Merapi Volcanic Ash

Sunardi

Silviana

2020

J. Kim. Sains Apl.

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Research on the synthesis and characterization of SiO2/ZnO nanocomposites from zinc waste and Mount Merapi volcanic ash has been carried out. The semiconductor used was ZnO using a SiO2 as the host material. The use of SiO2 was due to its high efficiency and abundant raw materials. This is because the eruption of Mount Merapi occurs regularly every four years. Apart from the abundant presence of SiO2, the source of ZnO from lathe workshop waste is also easy to obtain. The research aims to reduce the volume of zinc waste from the lathe and volcanic ash, which was not optimized. Zinc waste and volcanic ash were synthesized into nanocomposites. Then the obtained nanocomposites were characterized to determine their effectiveness in degrading various wastes. The synthesis of SiO2/ZnO nanocomposites was carried out using the sol-gel method as easy and highly effective. The method used is to transform zinc waste into Zn(OH)2. The volcanic ash was extracted with KOH to form potassium silicate (K2SiO3). Zn(OH)2, (K2SiO3) and HCl were reacted together when sonicated, then calcined at 550°C. The results showed that SiO2/ZnO nanocomposites made from volcanic ash and zinc waste produced composite sizes with a size range of 100-200 nm and a uniform circular shape. FTIR analysis results show that SiO has the peaks at wavenumbers of 993.34 and 1109.07 cm-1, while the ZnO peak is at wavenumbers of 443.63 cm-1. The XRD diffractogram of SiO2/ZnO nanocomposites shows peaks at 2θ of 30.42°, 31.56°, and 44.40°.

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Section: Synthesis Nanocomposite Si02 / Znomentioning

confidence: 90%

Synthesis and Characterization of SiO2/ZnO Nanocomposites from Zinc Waste and Mount Merapi Volcanic Ash

Sunardi

Silviana

2020

J. Kim. Sains Apl.

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“…Using magnetic materials as adsorbents are often carried out because separation can be performed only by utilizing an external magnetic field. However, the iron sand magnetic material has several drawbacks, including being very easily oxidized in air and its low stability in a suspension medium which causes the iron sand magnetic material to be unusable for a long time [11]. The magnetic iron sand material coated with silica is a good alternative to prevent oxidation on the surface of the iron sand.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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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Silica Magnetite Adsorbent: Effect of Drying Temperature of Silica Sol Gel on Magnetite Core Structure

Cited by 2 publications

References 11 publications

Synthesis and Characterization of SiO2/ZnO Nanocomposites from Zinc Waste and Mount Merapi Volcanic Ash

Synthesis and Characterization of SiO2/ZnO Nanocomposites from Zinc Waste and Mount Merapi Volcanic Ash

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

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