Adsorption of Methylene Blue Onto Acacia Modesta Carbon: Kinetic and Thermodynamic Study

2019 ◽  
Vol 233 (7) ◽  
pp. 1019-1033
Author(s):  
Sultan Alam ◽  
Noor Rehman ◽  
Noor Ul Amin ◽  
Aslam Khan ◽  
Hidayat Ullah
Keyword(s):  
Methylene Blue ◽  
Kinetic Data ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Chemical Activation ◽  
Adsorption Kinetic ◽  
Dye Molecules ◽  
C 30 ◽  
Kinetic And Thermodynamic Study ◽  
Scanning Electron

Abstract The adsorption of methylene blue was carried out by adsorbent prepared from Acacia modesta. The sample wood was collected from Dir lower Khyber Pakhtunkhwa Pakistan. Chemical activation of the sample was conducted for surface efficiency. Surface of raw and activated sample was elucidated by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared (FTIR) techniques. Adsorption of methylene blue was studied on raw and activated samples by kinetics adsorption at different adsorption temperatures such as 20 °C, 30 °C and 40 °C. The adsorption equilibrium was established within 2 h. Elovich, Bhangam, and Parabolic diffusion equations were applied to the adsorption kinetics data and were found fit for adsorption. From adsorption kinetic data the parameters like ΔH≠, ΔS≠ and ΔE≠ were calculated and showed that the adsorption process was spontaneous process. Entropy in descending order shows that dye molecules adsorbed in an oriented position.

Kinetic and Thermodynamic Study Adsorbing Methylene Blue on Nanozirconia

2013 ◽  
Vol 475-476 ◽  
pp. 1311-1319
Author(s):  
Ping Hua Chen ◽  
Xue Zhen Zhou ◽  
Yong Xiu Li ◽  
Dong Ping Li ◽  
Jing Li ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Thermodynamic Properties ◽  
Adsorption Process ◽  
Sorption Process ◽  
Kinetic Properties ◽  
High Adsorption ◽  
Adsorption Ability ◽  
Methylene Blue Adsorption ◽  
Influence Of Temperature ◽  
Kinetic And Thermodynamic Study

In present study, uniformed nanozirconia is obtained via precipitation, ball milling and spray drying. The characteristics of methylene blue adsorption by nanozirconia are studied in details. The morphology of nanozirconia is examined by SEM. The influence of temperature is studied to obtain the optimal adsorption conditions. The equilibrium adsorption isotherms and the kinetic properties of the adsorption process are investigated to study the mechanism. The thermodynamic properties of methylene blue adsorption is investigated, and the thermodynamic parameters of Gθ, Hθ and Sθ are calculated. The results show nanozirconia has high adsorption ability of 43.99 mg/g to methylene blue, and the adsorption reaction is a spontaneous and physic-sorption process.

scholarly journals Oyster Shell Waste (Crassostrea Gigas) as A Cheap Adsorbent for Adsorption Of Methylene Blue Dyes: Equilibrium and Kinetics Studies

2021 ◽  
Vol 1 (4) ◽  
pp. 95-102
Author(s):  
Muhammad Muhammad ◽  
Meriatna Meriatna ◽  
Nia Afriani ◽  
Rizka Mulyawan
Keyword(s):  
Methylene Blue ◽  
Correlation Coefficient ◽  
Crassostrea Gigas ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Oyster Shell ◽  
Second Order ◽  
Order Model ◽  
Pseudo Second Order ◽  
Shell Powder

In this study, Oyster (Crassostrea gigas) shell powder which contains calcium carbonate (CaCO3) was converted into calcium oxide (CaO). The Oyster shell powder that had been activated was utilized for the adsorption of the methylene blue (MB) dyeing material, which is one of waste water concerns. Oyster shells were crushed and sieved into 100 mesh sized powder and then calcinated at a temperature of 600℃ and 800℃ both for 4 hours period. To determine the adsorption equilibrium, methylene blue (MB) solution was used with varying concentration from 10 to 50 mg/L in which the adsorbent weighing 3 g was put into a conical flash and shaken until the adsorption equilibrium was reached. As for the adsorption kinetics, 250 mL MB solution was used with initial concentrations of 10, 20 and 30 mg/L, with an adsorbent weight of 3 g and a solution at pH 11 for each concentration. The evaluation of the experimental data from the adsorption process is well explained by the Freundlich equation, with the correlation coefficient value (R2) found to be 0.9999, where the value of the adsorption intensity (n) is close to unity; this shows that the adsorption is multilayer or in other words the adsorption energy is heterogeneous. The kinetics study also shows that pseudo second-order model is the most applicable to the adsorption process. From the pseudo-second-order model, with the correlation coefficient between 0.9984 - 0.9999 can explain that the methylene blue (MB) adsorption process is chemically based sorption or in other words termed as chemisorption.

scholarly journals Synthesis of silica of rice husk modification (3-aminopropyl) trietoxysilane for adsorption methylene blue

2018 ◽  
Vol 197 ◽  
pp. 09009
Author(s):  
Yusmaniar Yusmaniar ◽  
Darsef Darwis ◽  
Afrizal Afrizal ◽  
Annisa Annisa
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methylene Blue ◽  
Surface Area ◽  
Adsorption Process ◽  
Low Cost ◽  
Sol Gel ◽  
Alkaline Ph ◽  
Modified Silica ◽  
Scanning Electron

In this study, modified silica (3-Amynopropyl) triethoxysilane (APTES) synthesis and adsorption test of MB dye were performed. Silica is synthesized by sol-gel method and modified with APTES. APTES modified silica is characterized using several instruments, scanning electron microscopy (SEM), fourier transform infrared (FTIR), surface area analyzer (SAA) and UV-Vis spectrophotometer. The composite has a large surface area and has a mesoporous shape. At alkaline pH, MB dye can adsorb well. In addition, MB absorption is also maximized with the longer time of adsorption. The APTES modified silica adsorption process follows the Langmuir isotherm pattern. Thus, APTES modified silica can be used as an alternative to environmentally friendly and low-cost adsorbents.

scholarly journals Elimination of Methylene Blue by low-cost Biomaterial prepared from Local Natural Residue

2020 ◽  
Vol 2 (01) ◽  
pp. 60-66
Author(s):  
Fatma LANSARI ◽  
Meryem EDJEKOUANE ◽  
Omar KHELIFI ◽  
Ishak BOUKHETECHE ◽  
Ishak LAKSACI
Keyword(s):  
Methylene Blue ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Freundlich Model ◽  
Batch System ◽  
Natural Support ◽  
Uv Visible

This study aims to assess the use of natural waste (fruit kernels) for the preparation of a bimaterial in order to use it as a natural support for the elimination of a dye (methylene blue) from aqueous solutions for environmental protection. The biomaterial was characterized physicochemically and the determination of methylene blue concentration was carried out by a UV-Visible spectrophotometer. In order to clarify the adsorption process, experiments in a batch system were carried out to study the effect of operating parameters such as the initial concentration of methylene blue (2-10 mg·L-1), biomaterial (0.1-1 g) and the contact time (10-120 min). To describe the adsorption equilibrium, the experimental data were analyzed by the Langmuir isotherm and the Freundlich isotherm. The equilibrium is perfectly described by the Freundlich model (R2>0.99) and the adsorption process is multilayer. The results of the present study suggest that washingtonia seed (WS) can be advantageously used as a low-cost biosorbent for water discoloration

scholarly journals Study of Methylene Blue Adsorption by Modified Kaolinite by Dimethyl Sulfoxide

2020 ◽  
Vol 27 (2) ◽  
pp. 225-239
Author(s):  
Salima Lellou ◽  
Samir Kadi ◽  
Laid Guemou ◽  
Jacques Schott ◽  
Hadj Benhebal
Keyword(s):  
Methylene Blue ◽  
Dimethyl Sulfoxide ◽  
Kinetic Data ◽  
Contact Time ◽  
Basal Spacing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pseudo Second Order ◽  
Scanning Electron ◽  
Good Agreement

AbstractTamazert kaolin was modified with dimethyl sulfoxide (DMSO). The starting material and resulting from the intercalation were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). Intercalation caused considerable changes in our clay by increasing the basal spacing to 11.22 Å, an intercalation rate of 98 %. The adsorption of methylene blue was studied as a function of pH, contact time, temperature, dye concentrations and adsorbents. Kinetic data have been adequately described by the pseudo-second order and intraparticle scattering model. The adsorption isotherm is in good agreement with the Redlich-Peterson model. A change in thermodynamic values (ΔH°, ΔS° and ΔG°) was observed after intercalation. Adsorption became non-spontaneous exothermic and ordered.

Kinetic and Thermodynamic Study of Methylene Blue Adsorption onto Chitosan: Insights about Metachromasy Occurrence on Wastewater Remediation

2018 ◽  
Author(s):  
Julian Kellner-Rogers ◽  
Jeffrey Taylor ◽  
Arvid M. Masud ◽  
Nirupam Aich ◽  
Alexandre Pinto
Keyword(s):  
Methylene Blue ◽  
Structural Changes ◽  
Adsorption Process ◽  
Single Molecules ◽  
Thermodynamic Study ◽  
Wastewater Remediation ◽  
Visible Absorption ◽  
Ph Values ◽  
Kinetic And Thermodynamic Study ◽  
Mb Adsorption

<p>Methylene Blue (MB) is a dye frequently used in the textile industry and a potential wastewater pollutant. MB adsorption onto the surface of solid materials is a promising method for wastewater remediation. The biopolymer chitosan is one of the promising candidates as an adsorbent for MB removal from wastewater. However, the contact between MB and chitosan induces the aggregation of MB molecules. The formation of MB aggregates can lead to an appearance of additional bands in the MB visible absorption spectrum. This phenomenon is called metachromasy. In this paper, chitosan was used as adsorbent to study the kinetics and thermodynamic parameters related to the elimination of MB as single molecules (Sng-MB) and aggregates (Agg-MB) species from simulated wastewater. It was found that, for MB single molecules or aggregates, the adsorption process follows the pseudo second order adsorption kinetics model. For each temperature studied, Agg-MB always presented higher rate constant than Sng-MB, indicating a faster adsorption of Agg-MB in comparison to Sng-MB. Additionally, the adsorption process presented a lower activation energy for Agg-MB, indicating Agg-MB adsorption is favored in relation to Sng-MB. The thermodynamic studies indicated the adsorption process for both MB species is endothermic and spontaneous from 298 to 348 K. The adsorption isotherms could be properly fitted and interpreted according to Temkin and Dubinin-Radushkevich models. Studies varying the initial pH of MB solution indicated that metachromasy could be suppressed in acidic pH values, whereas alkaline pH values led to an increase in the removal percentage of Sng-MB and Agg-MB in relation to neutral conditions. The analysis of chitosan powder before and after adsorption indicated the adsorption process does not cause structural changes to the chitosan. The kinetic and thermodynamic study of the relative adsorption of MB single molecules and aggregates onto chitosan can provide fundamental information for MB wastewater remediation.</p>

scholarly journals The Olive Core, a Promoter Material for the Adsorption of Dyes: Effects on Certain Parameters, Kinetic and Thermodynamic Study

2018 ◽  
Vol 34 (6) ◽  
pp. 2859-2866
Author(s):  
Ahde El-Imache ◽  
Kamar Ouazzani
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Isotherm Models ◽  
Synthetic Dyes ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Natural Support ◽  
Kinetic And Thermodynamic Study ◽  
Adsorbent Characterization

In this study, the Moroccan Olive Core (OC) was chosen for the preparation of a bio-adsorbent for the purpose of using it as a natural support to remove two synthetic dyes: Methyl Blue (MB) and Crystal Violet (CV) from aqueous solutions. Tow adsorbent characterization techniques were used: Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Influence of some parameters is studied to characterize the adsorption process: contact time (0-45 min), temperature (25 -100 °C) and initial concentration of MB and CV (10-30 mg.l-1). Langmuir, Freundlich and Dubinin-Radushkevich isotherm models were used to describe the adsorption equilibrium. The equilibrium is perfectly described by the Freundlich model whose correlation coefficient is equal to 0.995 for MB and 0.991 for CV. Thermodynamic parameters were valued, and they showed that, for both dyes, the adsorption on MOC is endothermic and spontaneous.

Kinetic and Thermodynamic Study of Methylene Blue Adsorption onto Chitosan: Insights about Metachromasy Occurrence on Wastewater Remediation

2018 ◽  
Author(s):  
Julian Kellner-Rogers ◽  
Jeffrey Taylor ◽  
Arvid M. Masud ◽  
Nirupam Aich ◽  
Alexandre Pinto
Keyword(s):  
Methylene Blue ◽  
Structural Changes ◽  
Adsorption Process ◽  
Single Molecules ◽  
Thermodynamic Study ◽  
Wastewater Remediation ◽  
Visible Absorption ◽  
Ph Values ◽  
Kinetic And Thermodynamic Study ◽  
Mb Adsorption

<p>Methylene Blue (MB) is a dye frequently used in the textile industry and a potential wastewater pollutant. MB adsorption onto the surface of solid materials is a promising method for wastewater remediation. The biopolymer chitosan is one of the promising candidates as an adsorbent for MB removal from wastewater. However, the contact between MB and chitosan induces the aggregation of MB molecules. The formation of MB aggregates can lead to an appearance of additional bands in the MB visible absorption spectrum. This phenomenon is called metachromasy. In this paper, chitosan was used as adsorbent to study the kinetics and thermodynamic parameters related to the elimination of MB as single molecules (Sng-MB) and aggregates (Agg-MB) species from simulated wastewater. It was found that, for MB single molecules or aggregates, the adsorption process follows the pseudo second order adsorption kinetics model. For each temperature studied, Agg-MB always presented higher rate constant than Sng-MB, indicating a faster adsorption of Agg-MB in comparison to Sng-MB. Additionally, the adsorption process presented a lower activation energy for Agg-MB, indicating Agg-MB adsorption is favored in relation to Sng-MB. The thermodynamic studies indicated the adsorption process for both MB species is endothermic and spontaneous from 298 to 348 K. The adsorption isotherms could be properly fitted and interpreted according to Temkin and Dubinin-Radushkevich models. Studies varying the initial pH of MB solution indicated that metachromasy could be suppressed in acidic pH values, whereas alkaline pH values led to an increase in the removal percentage of Sng-MB and Agg-MB in relation to neutral conditions. The analysis of chitosan powder before and after adsorption indicated the adsorption process does not cause structural changes to the chitosan. The kinetic and thermodynamic study of the relative adsorption of MB single molecules and aggregates onto chitosan can provide fundamental information for MB wastewater remediation.</p>

scholarly journals UTILIZAÇÃO DO RESÍDUO DE ERVA-MATE COMO MATERIAL ADSORVENTE DO CORANTE AZUL DE METILENO

2018 ◽  
Vol 39 (1) ◽  
pp. 227
Author(s):  
Márcia T. Veit ◽  
S. Bedin ◽  
S. M. Palácio ◽  
M. R. Fagundes-Klen ◽  
G. C. Gonçalves
Keyword(s):  
Methylene Blue ◽  
Kinetic Data ◽  
Adsorption Process ◽  
Langmuir Model ◽  
Ilex Paraguariensis ◽  
Particle Sizes ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
The One ◽  
Kinetic Equilibrium

The residue of erva-mate (Ilex paraguariensis St. Hil) was used as a potential adsorbent to remove methylene blue in aqueous solutions. Three particle sizes and three agitation speeds were evaluated on the adsorption process. The kinetic equilibrium was reached about 350 minutes. The kinetic model of pseudo-second order was the one that best described the kinetic data of adsorption. The equilibrium data were better represented by Langmuir model with a qmax of 44.84 mg.g-1 for a temperature of 30°C. The residue of erva-mate proved to be an alternative adsorbent with potential to removal of this dye.

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