Kinetic and Thermodynamics of Methylene Blue Adsorption onto Zero Valent Iron Supported on Mesoporous Silica

Hameed, Atyaf Khalid; Dewayanto, Nugroho; Du, Dongyun; Nordin, Mohd Ridzuan; Hasbi, Ab. Rahim Mohd

doi:10.9767/bcrec.11.2.443.250-261

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…As seen from Table 3, with the pseudo-second-order and pseudo-first-order models, that were used to test the adsorption kinetically, the pseudo-second-order models showed the better fit of the empirical data with R 2 from 0.98 to 0.99. 21,22 , the change of enthalpy (∆H°) for both synthetic dyes in this study was negative or exothermic as shown on the less in adsorption percentage with increases in temperature. The positive values of entropy change (∆S°) for both synthetic dyes maintain the elevated randomness at the solution -solid interface along with the adsorption of the dye on the surface of silica.…”

mentioning

confidence: 49%

Silica Extraction From Beach Sand for Dyes Removal: Isotherms, Kinetics and Thermodynamics

Firdaus¹,

Madina²,

Yulia³

et al. 2020

RJC

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Beach sand is an abundant natural resource that contains silica minerals with many benefits. One of the uses of silica is to remove synthetic dyes that are toxic to biota in the environment. The goal of this research was to extract and characterize the silica from Bengkulu beach sand and to apply it as dyes adsorbent. The extraction of silica consisted of two steps that were potassium silicate formation and gel formation. The gel was formed by adding strong acid into a potassium silicate solution. Silica's particle size and crystallinity were characterized using PSA and XRD, respectively. SEM-EDS was used to characterize the morphology and chemical composition of extracted silica. The effect of the different experimental settings, like pH, temperature, contact time, the concentration of dyes and adsorbent weight, on adsorption of dyes were monitored as well as the study of adsorption isotherms, kinetics, and thermodynamics. At equilibrium, synthetic dyes adsorption to silica suited to the Freundlich model producing correlation coefficients (R 2 ) of 0.853 and 0.976 for remazol blue and congo red, respectively. At optimum conditions, maximum adsorption capacities for remazol blue and congo red were 133 and 131 mg/g, respectively. The research implied that adsorption of dyes to silica fitted the pseudo-second-order model with thermodynamic values of ∆G°, ∆H°, and ∆S° were -4.04 to 2.19 kJ/mol, -13.53 to -4.726 kJ/mol, and 0.019 to 0.021 J/mol.K, respectively. By using these results, we resolve that the adsorption of dyes trends was exothermic and spontaneous. In addition, the reaction increases the system's entropy. This study emphasizes the potential of silica from the sand beach as a substitute economical adsorbent for the toxic dyes removal.

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mentioning

confidence: 49%

Silica Extraction From Beach Sand for Dyes Removal: Isotherms, Kinetics and Thermodynamics

Firdaus¹,

Madina²,

Yulia³

et al. 2020

RJC

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“…The adsorption of cationic dye MB particularly takes place at acidic pH, where the oxide/hydroxide surface becomes negatively charged and can form surface complexes with cations. The complexes of MB and intermediates with iron(II) and iron(III) oxides/hydroxides are also adsorbed on the nZVI surface .…”

Section: Resultsmentioning

confidence: 99%

“…For example, the maximum removal of 50 (mg⋅L −1 ) MB could be achieved within 60 min with zero‐valent iron supporting mesoporous silica (NZVI/MSNS). NZVI/MSNS exhibits good performance in the adsorption of methylene blue with an adsorption capacity of 71 (mg⋅L −1 ), and it can be considered as a promising adsorbent for application in industrial waste water remediation .…”

Section: Resultsmentioning

confidence: 99%

Zero valent iron loaded on SiC nanoparticles as a new adsorbent for removing Pb (lead) and azo dyes from aqueous solution

Lemraski

Tahmasebi

2017

Env Prog and Sustain Energy

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A reusable silicon carbide nanoparticle supported by nano zero‐valent iron (nZVI) is prepared by a simple precipitation method. The results of thermal gravimetric analysis (TGA), dynamic light scattering (DLS), vibrating‐sample magnetometer (VSM), Fourier transform infrared spectroscopy (FT‐IR), transmission electron microscopy (TEM), scanning electron microscopy with X‐ray microanalysis (SEM‐EDS), X‐ray powder diffraction, and N2 adsorption isotherms indicated that the zero‐valent iron was successfully deposited onto the silicon carbide surface. An investigation into the adsorption ability of this material showed that the SiC nano particle coated with nZVI was expected to form a more active nano composite with higher efficiency for the removal of Pb2+ ions from an aqueous solution. Such findings suggest strong practical applications of modified silicon carbide nano particles with other nano particles as new adsorbents, sensors, as well as for drug delivery and catalysis due to their proper pore sizes, high‐specific areas, and high mechanical and chemical stabilities. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1657–1667, 2018

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“…Therefore, the system requires a net energy for effective adsorption that provides an endothermic process. On the basis of the obtained thermodynamic parameters, the adsorption process was concluded to be both endothermic and spontaneous (Hameed et. al.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Synthesis and characterization of nano-zinc oxide fiber: adsorption of acid blue 92 dye, isotherms, thermodynamics and kinetics

Qais

Islam

Othman

et al. 2022

Preprint

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Rapid industrialization, particularly textile/dyeing, causes substantial surface water contamination by various dyes and pigments globally. Bangladesh’s export-oriented textile industry has grown dramatically in recent decades, causing significant pollution of nearby water bodies. In this work, nano-zinc oxide was synthesized by a precipitation method with PEG 400 and characterized using SEM, XRD and FTIR techniques and found to be fiber-like, perfectly wurtzite and pure. The nano-ZnO was applied to remove acid blue 92, an ionic dye, from aqueous solution to investigate it as an adsorbent. The effects of pH, adsorbent dosage, AB92 concentration and contact time on adsorption process were investigated for optimization. According to the correlation coefficients ( R 2 ) and the fitting of Redlich-Peterson model, the adsorption process followed Langmuir isotherm at lower temperature and Freundlich isotherm at higher temperature with Temkin model. The adsorption process was found to be endothermic and spontaneous. For adsorption thermodynamics, ΔH was found to be +20.32 kJmol -1 , and ΔG was varied from -1.86 to -3.84 kJmol -1 as the temperature increased from 291 to 317 K. The adsorption kinetics exhibited pseudo second order. The Temkin isotherm and Elovich kinetic model suggested that the process to be chemisorption. The nano-ZnO showed tremendous re-usability as an adsorbent for the removal of AB92. The results are suggesting for designing nano-ZnO-based methods to remove organic pollutants efficiently from industrial effluents for ecological and sustainable development. The mechanisms of nano-ZnO fiber formation and anionic dye adsorption on nano-ZnO are also discussed.

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Kinetic and Thermodynamics of Methylene Blue Adsorption onto Zero Valent Iron Supported on Mesoporous Silica

Cited by 9 publications

References 25 publications

Silica Extraction From Beach Sand for Dyes Removal: Isotherms, Kinetics and Thermodynamics

Silica Extraction From Beach Sand for Dyes Removal: Isotherms, Kinetics and Thermodynamics

Zero valent iron loaded on SiC nanoparticles as a new adsorbent for removing Pb (lead) and azo dyes from aqueous solution

Synthesis and characterization of nano-zinc oxide fiber: adsorption of acid blue 92 dye, isotherms, thermodynamics and kinetics

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