Synthesis of magnetic zeolites from recycled fly ash for adsorption of methylene blue

Supelano, G. I.; Cuaspud, Jairo Alberto Gómez; Moreno-Aldana, Luis Carlos; Ortíz, César; Trujillo, Carlos‐Alexander; Palacio, C.A.; Vargas, Carlos Arturo Parra; Gómez, Julieth Alexandra Mejía

doi:10.1016/j.fuel.2019.116800

Cited by 78 publications

(27 citation statements)

References 23 publications

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“…Fly ash is preferred as an adsorbent since it is a cheap and highly-available material [ 24 , 25 ]. On the other hand, there are highlights that the presence of fly ash discharged from thermal power plants by the burning of coal represents a big environmental issue [ 26 , 27 , 28 , 29 ]. Unmodified fly ash presents small adsorption capacities.…”

Section: Introductionmentioning

confidence: 99%

Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

et al. 2020

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Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.

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Section: Introductionmentioning

confidence: 99%

Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

et al. 2020

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“…As a result of coal combustion, fly ash is found in large quantities and it has been reported that this fact causes serious environmental problems [ 10 , 11 ]; therefore, it must be addressed [ 12 , 13 ]. Fly ash is rich in aluminosilicate and includes polymeric minerals and inorganic oxide material [ 14 , 15 ]. The use of ash as an adsorbent for the retention of heavy metals is a widely studied field [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

et al. 2020

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Wastes are the sustainable sources of raw materials for the synthesis of new adsorbent materials. This study has as objectives the advanced capitalization of fly ash, by sulphuric acid activation methods, and testing of synthesized materials for heavy metals removal. Based on the previous studies, the synthesis parameters were 1/3 s/L ratio, 80 °C temperature and 10% diluted sulphuric acid, which permitted the synthesis of an eco-friendly adsorbent. The prepared adsorbent was characterized through SEM, EDX, FTIR, XRD and BET methods. Adsorption studies were carried out for the removal of Cd2+ ions, recognized as ions dangerous for the environment. The effects of adsorbent dose, contact time and metal ion concentrations were studied. The data were tested in terms of Langmuir and Freundlich isotherm and it was found that the Langmuir isotherm fitted the adsorption with a maximum adsorption capacity of 28.09 mg/g. Kinetic data were evaluated with the pseudo-first-order model, the pseudo-second-order model and the intraparticle diffusion model. The kinetics of cadmium adsorption into eco-friendly material was described with the pseudo-second-order model, which indicated the chemisorption mechanism.

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“…The adsorption quantity of Fa was 3.5 mg/g in 20 mins and 10.5 mg/g in 150 mins, respectively. The adsorption capacity of Fa should be attributed to the properties of its particle surface [49,50]. The synthesis process of catalyst might make its surface adsorption capacity slightly improved.…”

Section: O E Omentioning

confidence: 99%

Synthesis of Fly Ash Magnetic Glass Microsphere@BiVO<sub>4</sub> and Its Hybrid Action of Visible-Light Photocatalysis and Adsorption Process

Cheng¹,

Chen²,

Wang³

et al. 2021

Pol. J. Environ. Stud.

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A novel composite photocatalyst (fly ash magnetic glass microsphere@BiVO 4 , called FaBi), where the magnetic glass microsphere (from fly ash) was used as magnetic carriers for BiVO 4 , was synthesized. The properties of composite photocatalyst were characterized by XRD, FT-IR, SEM, XPS, UV-vis, magnetic hysteresis loop and DFT caculation. After the synthesis reaction, the smaller spherical BiVO 4 (2-4 μm) was successfully loaded on the surface of magnetic glass microspheres. The composite catalyst of FaBi had obvious ferromagnetism, and the saturation magnetization was 27.52 emu/g. The photocatalytic experiments results showed that the composite catalyst could effectively degrade MB (Methylene blue) in the solution under visible light excitation. The apparent degradation process of MB was satisfactorily fitted by the first-order reaction kinetics. After several times of recycling, the photocatalysis of the material remained basically stable. The photocatalytic degradation of MB in solution was mainly due to the direct oxidation of free holes and related free radical reaction. The efficient adsorption of MB from solution was ascribed to large specific surface area of composite catalyst. The adsorption process was well modeled by the pseudo-first-order kinetic equation and Langmuir adsorption isotherm. The adsorption function enhanced the degradation effect of photocatalysis for target pollutant in solution. DFT calculation verified the photocatalytic properties of BiVO 4 (calculated energy band is 2.213eV) under visible light. The fly ash magnetic glass microsphere could be used as an excellent magnetic carrier for photocatalyst materials.

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Synthesis of magnetic zeolites from recycled fly ash for adsorption of methylene blue

Cited by 78 publications

References 23 publications

Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

Synthesis of Fly Ash Magnetic Glass Microsphere@BiVO<sub>4</sub> and Its Hybrid Action of Visible-Light Photocatalysis and Adsorption Process

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