Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

Metakaolin-based geopolymers are aluminosilicate materials that can be used as cationic dye adsorbents in aqueous system treatment. Our aim in this paper is to study the ability of geopolymer powder produced from metakaolin and alkaline activators to act as an adsorbent to remove methylene blue (MB). The solid materials were systematically analyzed by X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectrometery (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and the point of zero charge. XRF, FTIR, XRD, SEM, and EDX analyses confirmed the formation of a geopolymer composite by geopolymerization reaction. The influence of various experimental factors such as geopolymer dosage, pH, initial dye concentration, contact time, and temperature was assessed. Adsorption isotherms were evaluated by Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherms. Kinetics data were studied using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The thermodynamic parameters, namely, Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°), were determined. The results indicated that the maximum decolorization was found in high pH values. The collected isotherm data were best fitted by the Langmuir isotherm, and the maximum adsorption capacity of dye onto the geopolymer was 43.48 mg/g. The experiment kinetics followed the pseudo-second-order kinetic models. The thermodynamic results demonstrated that the adsorption of the obtained material occurs spontaneously as an endothermic process. The results confirmed that the prepared adsorbent can be used for remediation of water contaminated by MB dye.

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Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

Scientific Reports ◽

10.1038/s41598-020-74819-x ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Giannin Mosoarca ◽

Cosmin Vancea ◽

Simona Popa ◽

Marius Gheju ◽

Sorina Boran

Keyword(s):

Methylene Blue ◽

Low Cost ◽

Dye Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adsorbent Surface ◽

Order Kinetic Model ◽

Endothermic Process ◽

Pseudo Second Order ◽

Better Than

Abstract In this study, the potential of a new low-cost adsorbent, Syringa vulgaris leaves powder, for methylene blue adsorption from aqueous solution was investigated. The adsorbent surface was examined using SEM and FTIR techniques. The experiments were conducted, in batch system, to find out the effect of pH, contact time, adsorbent dose, initial dye concentration, temperature and ionic strength on dye adsorption. The process is best described by Langmuir isotherm and the pseudo second order kinetic model. Maximum adsorption capacity, 188.2 (mg g−1), is better than other similar adsorbent materials. Thermodynamic parameters revealed a spontaneous and endothermic process, suggesting a physisorption mechanism. A Taguchi orthogonal array (L27) experimental design was used to determine the optimum conditions for the removal of dye. Various desorbing agents were used to investigate the regeneration possibility of used adsorbent. Results suggest that the adsorbent material is very effective for removal of methylene blue from aqueous solutions.

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Equilibrium, Kinetic and Thermodynamic Studies of Biosorption of Methylene Blue on Goethite Modified Baobab Fruit Pod (Adansonia Digitata L.)

Journal of Applied Sciences and Environmental Management ◽

10.4314/jasem.v24i7.16 ◽

2020 ◽

Vol 24 (7) ◽

pp. 1229-1243

Author(s):

A.H. Alabi ◽

E.O. Oladele ◽

A.J.O. Adeleke ◽

F.C. Oni ◽

C.A. Olanrewaju

Keyword(s):

Methylene Blue ◽

Kinetic Data ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adansonia Digitata ◽

Adsorption Data ◽

Freundlich Adsorption Isotherm ◽

Intra Particle Diffusion ◽

Pseudo Second Order

Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit pod and its goethite modified form. Adsorbents were characterized using Fourier Transform-Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Batch experiments were conducted at room temperature (26.8 °C) and the adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherms. Also, kinetic data was fitted using Pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion models. Goethite modified baobab (GMB) appeared to have a coarse microporous surface with smoother surface and larger pore volumes compared to unmodified baobab (UB). The –C=O band was observed at 1631 and 1636 cm-1 for UB and GMB. The –OH band was observed at 3447.00 cm-1 and 3442 cm-1 for UB andGMB respectively. Langmuir model was suitable for describing the adsorption data of UB with R2 of 0.9293 while Temkin model was best for fitting adsorption data of MB on GMB with R2 of 0.9691. However, maximum adsorption capacity was obtained with Freundlich adsorption isotherm (15.4253 and 43.1301 mg/g for UB and GMB respectively). The maximum biosorption were 8.98 mg/g and 9.86 mg/g for UB and GMB respectively at pH 10. Pseudo-second-order kinetic model best fitted the kinetic data with R2 values of 0.9968 and 0.9993 for UB and GMB, ΔHo values were 83.123 KJ/mol and 361.094 KJ/mol for UB and GMB, while ΔSo values were 3.084 J/mol/ K and 1.765 J/mol/K for UB and GMB respectively. GMB adsorbed more of MB than UB and the process was endothermic. Keywords: Biosorption, Goethite, Baobab, Isotherms, Methylene blue.

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Adsorption of methylene blue from aqueous solution onto activated carbons developed from eucalyptus bark and Crataegus oxyacantha core

Water Science & Technology ◽

10.2166/wst.2016.287 ◽

2016 ◽

Vol 74 (9) ◽

pp. 2021-2035 ◽

Cited By ~ 3

Author(s):

Mohammad Ali Zazouli ◽

Ali Azari ◽

Samaneh Dehghan ◽

Razieh Salmani Malekkolae

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Activated Carbon ◽

Activated Carbons ◽

Second Order ◽

Point Of Zero Charge ◽

Polluted Water ◽

Order Kinetic ◽

Pseudo Second Order ◽

Eucalyptus Bark

In this study, eucalyptus bark and Crataegus oxyacantha core-based activated carbon were synthesized and their morphological features characterized by scanning electron microscopy and Fourier transform infrared spectroscopy techniques. The efficiency of synthesized adsorbents in removal of methylene blue (MB) from aqueous solution was investigated in a series of batch experiments. Furthermore, the influences of various experimental factors involving the contact time, the initial dye concentration, the adsorbent dosage, and the pH of the dye solution were investigated. The point of zero charge (pHpzc) of the applied adsorbents was also determined. In addition, the experimental data were expressed by Langmuir, Freundlich and Tempkin isotherms and pseudo-first order and pseudo-second order kinetic models. Adsorption equilibrium of the two adsorbents was reached within 1 h for MB concentrations of 20 to 100 mg/L. The equilibrium data obtained at optimum conditions of MB sorption by eucalyptus bark activated carbon and Crataegus oxyacantha core activated carbon were best fitted to Tempkin and Langmuir isotherm models, respectively. Besides, it was revealed that the adsorption rate follows a pseudo-second order kinetic model. From the findings of this study, it can be postulated that these adsorbents could be of great potential as a new class of adsorbents for organic dye removal from polluted water.

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Cr6+ adsorption by modified vermiculite

10.5194/egusphere-egu2020-1394 ◽

2020 ◽

Author(s):

Valeria Medoro ◽

Celia Marcos Pascual ◽

Giacomo Ferretti ◽

Giulio Galamini ◽

Massimo Coltorti

Keyword(s):

Earth Sciences ◽

Inductively Coupled Plasma ◽

Contact Time ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Experimental Conditions ◽

X Ray ◽

Pseudo Second Order

Abstract: Cr6+ adsorption by modified vermiculite&#160;Valeria Medoro- University of Ferrara , Department of Physics and Earth Sciences, ItalyCelia Marcos Pascual-University of Oviedo, Department of Geology, SpainGiacomo Ferretti- University of Ferrara , Department of Physics and Earth Sciences, ItalyGiulio Galamini- University of Ferrara , Department of Physics and Earth Sciences, ItalyMassimo Coltorti- University of Ferrara , Department of Physics and Earth Sciences, Italy&#160;This work aimed at investigating the adsorption of Cr6+&#160;in water by exfoliated vermiculite. The adsorbant tested in this experiment was a vermiculite (from China) which has been subjected to heating at 1000 &#176;C for 1 minute, resulting in an exfoliated vermiculite.Three effects were studied: 1) contact time; 2) initial concentracion of Cr6+; 3) adsorbent mass. Samples were analysed by X Ray Fluorescence (XRF), X Ray Diffraction (XRD) and the solutions with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to quantify the adsorbed Cr6+ by the vermiculite.Results from XRD diffraction showed a conversion of vermiculite into flogopite&#160; after heating at 1000&#176;C for 1 minute because of: 1) high content of potassium, 2) dehydration and 3) structural re-ordering; after the contact of vermiculite with Cr6+, the mineral structure did not change. The adsorption of Cr6+&#160;was studied by Langmuir, Freundlich and&#160;Dubinin-Kaganer-Radushkevich&#160;(DKR) isotherm models. DKR model, indicative of a cooperative process, described adsorption equilibrium better than the other two models and the maximum adsorption capacity obtained was of 2.81 mol/g. Kinetic was studied using pseudo-first and pseudo-second order kinetic models, with a better description of the process by pseudo-second order model with correlation coefficient almost unitary (R2=0.9984; other kinetic parameters were k2=0.0015 and the absorption initial rate of 0.2x10-8 mg g-1 h-1).&#160;The present study demonstrates the effectiveness of modified vermiculite adsorbents for the treatment of hexavalent chromium-contaminated waters and that its adsorption depends on the experimental conditions (such as contact time, initial concentracion of Cr6+ and adsorbent mass).

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Novel Adsorbent for Industrial Wastewater Treatment Applications

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.l3223.119119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 1219-1225

Keyword(s):

Methylene Blue ◽

Second Order ◽

Thymol Blue ◽

Batch Adsorption ◽

Particle Diffusion ◽

Maximum Adsorption Capacity ◽

Basic Solution ◽

Order Kinetic ◽

Intra Particle Diffusion ◽

Pseudo Second Order

In this study, the hydroxyapatite powder is investigated for both of methylene blue and thymol blue in aqueous solution. The physical and chemical properties of the adsorbent were evaluated systematically using the different techniques including Microsoft Excel programming, linear regression model and also the coefficient of determination. Batch adsorption experiments were conducted to determine the effect of contact time, solution pH, initial dye concentrations, and also the adsorbent dosage on adsorption. The adsorption kinetic parameters confirmed the better fitting of pseudo-second order kinetic model for both of methylene blue and thymol blue. The isotherm data of methylene blue and thymol blue could be well described by the Freundlich isotherm model which means the adsorption is multilayer adsorption with non-uniform distribution of adsorption heat and affinities over the heterogeneous surface. The maximum adsorption capacity (KF) of methylene blue and thymol blue is found to be 0.2736 (L/mg) and 11.18407 (L/mg) respectively. The high specific surface area and the porous structure with some acidic functional groups on the surface were obviously responsible for high dyes adsorption onto hydroxyapatite (HA). Adsorption kinetics data were modeled with the application of Pseudo first order, Pseudo second order and Intraparticle diffusion models. The results revealed that the Pseudo second order model was the best fitting model. Which means that, the adsorption mechanism followed two stages in which the first one was fast and the other was slower step. Which means the adsorption of dye molecules was limited by intra particle diffusion and film diffusion, as well as, the adsorption rate in both of adsorption system are depends only on the slower step.The Boyd plot exposed that the intra-particle diffusion was the rate controlling step of the adsorption process of both of methylene blue and thymol blue molecules by HA powder. However, the adsorption of methylene blue molecules (basic solution) using of HA as adsorbent particles is found to be extremely preferable than thymol blue molecules.

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Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium

Journal of Nanomaterials ◽

10.1155/2016/2813289 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 5

Author(s):

Prasanna Kumarathilaka ◽

Vimukthi Jayaweera ◽

Hasintha Wijesekara ◽

I. R. M. Kottegoda ◽

S. R. D. Rosa ◽

...

Keyword(s):

Point Of Zero Charge ◽

Inert Material ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

X Ray Diffraction ◽

Graphene Composite ◽

Removal Capacity ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

First Time

Embedding nanoparticles into an inert material like graphene is a viable option since hybrid materials are more capable than those based on pure nanoparticulates for the removal of toxic pollutants. This study reports for the first time on Cr(VI) removal capacity of novel starch stabilized nanozero valent iron-graphene composite (NZVI-Gn) under different pHs, contact time, and initial concentrations. Starch coated NZVI-Gn composite was developed through borohydrate reduction method. The structure and surface of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and point of zero charge (pHpzc). The surface area and pHpzc of NZVI-Gn composite were reported as 525 m2 g−1 and 8.5, respectively. Highest Cr(VI) removal was achieved at pH 3, whereas 67.3% was removed within first few minutes and reached its equilibrium within 20 min obeying pseudo-second-order kinetic model, suggesting chemisorption as the rate limiting process. The partitioning of Cr(VI) at equilibrium is perfectly matched with Langmuir isotherm and maximum adsorption capacity of the NZVI-Gn composite is 143.28 mg g−1. Overall, these findings indicated that NZVI-Gn composite could be utilized as an efficient and magnetically separable adsorbent for removal of Cr(VI).

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Kinetic Study of the Bioadsorption of Methylene Blue on the Surface of the Biomass Obtained from the Algae D. antarctica

Journal of Chemistry ◽

10.1155/2018/2124845 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 10

Author(s):

Jhonatan R. Guarín ◽

Juan Carlos Moreno-Pirajan ◽

Liliana Giraldo

Keyword(s):

Methylene Blue ◽

Kinetic Study ◽

Adsorption Capacity ◽

Scientific Community ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Pseudo Second Order ◽

Best Fit ◽

Total Elimination ◽

Purification Of Water

Currently, there is a great pollution of water by the dyes; due to this, several studies have been carried out to remove these compounds. However, the total elimination of these pollutants from the aquatic effluents has represented a great challenge for the scientific community, for which it is necessary to carry out investigations that allow the purification of water. In this work, we studied the bioadsorption of methylene blue on the surface of the biomass obtained from the algae D. antarctica. This material was characterized by SEM and FTIR. To the data obtained in the biosorption experiments, different models of biosorption and kinetics were applied, finding that the best fit to the obtained data is given by applying the pseudo-second-order models and the Toth model, respectively. It was also determined that the maximum adsorption capacity of MB on the surface of the biomass is 702.9 mg/g, which shows that this material has great properties as a bioadsorbent.

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Kinetics of lead ion biosorption from aqueous solution onto lyophilized Aspergillus niveus

Water Practice & Technology ◽

10.2166/wpt.2010.020 ◽

2010 ◽

Vol 5 (1) ◽

Cited By ~ 6

Author(s):

Hülya Karaca ◽

Turgay Tay ◽

Merih Kıvanç

Keyword(s):

Adsorption Capacity ◽

Correlation Coefficients ◽

Freundlich Isotherm ◽

Second Order ◽

Lead Ions ◽

Lead Ion ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Aspergillus Niveus ◽

Pseudo Second Order

The biosorption of lead ions (Pb2+) onto lyophilized fungus Aspergillus niveus was investigated in aqueous solutions in a batch system with respect to pH, contact time and initial concentration of the ions at 30 °C. The maximum adsorption capacity of lyophilized A. niveus was found to be 92.6 mg g−1 at pH 5.1 and the biosorption equilibrium was established about in 30 min. The adsorption capacity obtained is one of the highest value among those reported in the literature. The kinetic data were analyzed using the pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion equations. Kinetic parameters, such as rate constants, equilibrium adsorption capacities, and related correlation coefficients for the kinetic models were calculated and discussed. It was found that the adsorption of lead ions onto lyophilized A. niveus biomass fit the pseudo-second-order kinetic model well. The Langmuir and Freundlich isotherm parameters for the lead ion adsorption were applied and the Langmuir model agreed better with the adsorption of lead ions onto lyophilized A. niveus.

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Molybdenum Trioxide: Efficient Nanosorbent for Removal of Methylene Blue Dye from Aqueous Solutions

Molecules ◽

10.3390/molecules23092295 ◽

2018 ◽

Vol 23 (9) ◽

pp. 2295 ◽

Cited By ~ 10

Author(s):

Souad Rakass ◽

Hicham Oudghiri Hassani ◽

Mostafa Abboudi ◽

Fethi Kooli ◽

Ahmed Mohmoud ◽

...

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Removal Efficiency ◽

Molybdenum Trioxide ◽

Second Order ◽

Blue Dye ◽

Order Kinetic ◽

Methylene Blue Dye ◽

Removal Capacity ◽

Pseudo Second Order

Nano Molybdenum trioxide (α-MoO3) was synthesized in an easy and efficient approach. The removal of methylene blue (MB) in aqueous solutions was studied using this material. The effects of various experimental parameters, for example contact time, pH, temperature and initial MB concentration on removal capacity were explored. The removal of MB was significantly affected by pH and temperature and higher values resulted in increase of removal capacity of MB. The removal efficiency of Methylene blue was 100% at pH = 11 for initial dye concentrations lower than 150 ppm, with a maximum removal capacity of 152 mg/g of MB as gathered from Langmuir model. By comparing the kinetic models (pseudo first-order, pseudo second-order and intraparticle diffusion model) at various conditions, it has been found that the pseudo second-order kinetic model correlates with the experimental data well. The thermodynamic study indicated that the removal was endothermic, spontaneous and favorable. The thermal regeneration studies indicated that the removal efficiency (99%) was maintained after four cycles of use. Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM) confirmed the presence of the MB dye on the α-MoO3 nanoparticles after adsorption and regeneration. The α-MoO3 nanosorbent showed excellent removal efficiency before and after regeneration, suggesting that it can be used as a promising adsorbent for removing Methylene blue dye from wastewater.

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Adsorption of heavy metals from aqueous solutions by Mg–Al–Zn mingled oxides adsorbent

Water Science & Technology ◽

10.2166/wst.2016.329 ◽

2016 ◽

Vol 74 (7) ◽

pp. 1644-1657 ◽

Cited By ~ 8

Author(s):

Mona El-Sayed ◽

Gh. Eshaq ◽

A. E. ElMetwally

Keyword(s):

Heavy Metals ◽

Metal Ion ◽

Second Order ◽

Ion Concentration ◽

Precipitation Method ◽

Isotherm Models ◽

Infrared Spectrometry ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Pseudo Second Order

In our study, Mg–Al–Zn mingled oxides were prepared by the co-precipitation method. The structure, composition, morphology and thermal stability of the synthesized Mg–Al–Zn mingled oxides were analyzed by powder X-ray diffraction, Fourier transform infrared spectrometry, N2 physisorption, scanning electron microscopy, differential scanning calorimetry and thermogravimetry. Batch experiments were performed to study the adsorption behavior of cobalt(II) and nickel(II) as a function of pH, contact time, initial metal ion concentration, and adsorbent dose. The maximum adsorption capacity of Mg–Al–Zn mingled oxides for cobalt and nickel metal ions was 116.7 mg g−1, and 70.4 mg g−1, respectively. The experimental data were analyzed using pseudo-first- and pseudo-second-order kinetic models in linear and nonlinear regression analysis. The kinetic studies showed that the adsorption process could be described by the pseudo-second-order kinetic model. Experimental equilibrium data were well represented by Langmuir and Freundlich isotherm models. Also, the maximum monolayer capacity, qmax, obtained was 113.8 mg g−1, and 79.4 mg g−1 for Co(II), and Ni(II), respectively. Our results showed that Mg–Al–Zn mingled oxides can be used as an efficient adsorbent material for removal of heavy metals from industrial wastewater samples.

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