Characterization and Modification of a Clay Mineral Used in Adsorption Tests

Dias, Natália C.; Steiner, Patrícia Arns; Braga, Maria Cristina Borba

doi:10.4236/jmmce.2015.34030

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…Cation exchange capacity (CEC) of raw vermiculite was determined with a potentiometric technique using 0.5 N HCl (23) and calculated as 205 meq/100 g and this is a good value compared with other studies in the literature (24,25).…”

Section: Physicochemical Propertiesmentioning

confidence: 82%

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Akalın¹,

Hiçsönmez²,

Yılmaz³

2017

Journal of the Turkish Chemical Society, Section A: Chemistry

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In this study, cesium adsorption performance of raw vermiculite obtained from Sivas-Yıldızeli region of Turkey was investigated using batch adsorption method. In order to obtain the optimum adsorption conditions; different adsorbent dosages, contact times, solution pH's, initial cesium concentrations and temperature ranges were investigated. The concentration of cesium in solution was determined by ICP-OES. Kinetic studies demonstrated that adsorption process was in accordance with pseudo-second order kinetic model and equilibrium isotherm modeling studies showed that the process was compatible with Langmuir, Freundlich and Temkin adsorption isotherm models, indicating that Cs adsorption process had both physical and chemical character. Negative Gibbs energy values obtained from thermodynamic studies revealed that the adsorption process was spontaneous and had a high feasibility. Additionally, the negative enthalpy value indicated that process was exothermic, suggesting that the adsorbed Cs + ions decreased with increasing reaction temperatures. Positive entropy value showed that disorderliness between solid-liquid phase increased during adsorption. Results clearly indicate that vermiculite mineral has a promising potential in removing Cs + ions from aqueous media which leads mineral may also be used in decomposing and efficiently removing radioactive cesium from contaminated waters.

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Section: Physicochemical Propertiesmentioning

confidence: 82%

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Akalın¹,

Hiçsönmez²,

Yılmaz³

2017

Journal of the Turkish Chemical Society, Section A: Chemistry

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“…and the concentration of adsorptive left in solution during equilibrium at constant temperature (Dias et al 2015). Suitable isotherm provides a description of an adsorption process.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…A dimensionless constant, known as separation factor R L evaluates an adsorption process in terms of favorability of occurrence, linearity and reversibility. (0 < R L < 1) suggests that the adsorption is favorable, (R L > 1) suggests that the adsorption is unfavorable, (R L = 1) suggests that the adsorption is linear, and (R L = 0) suggests that the adsorption is irreversible (Dias et al 2015). The separation factor is mathematically defined as:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

Oluyinka

Patel²,

Shah

et al. 2020

Appl Water Sci

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Abstractp-Nitroaniline (PNAN) and nitrobenzene (NB) being important raw materials and intermediates for the production of a wide range of chemical products have the potential of constituting water pollutants. Hence, the development of the means of removing these chemicals from water would go a long way to safeguard the health of the environment. The goal of this research was to transform bagasse fly ash (BFA), solid waste from the sugar industry into porous zeolitic adsorbents MgFZBFA and MgMZBFA and examine them for their adsorptive removal of PNAN and NB from aqueous solutions. The syntheses of the sorbents involve alkali fusion technique and microwave hydrothermal treatment for the desired properties. Advanced characterization techniques such as FTIR (Fourier transform infrared spectroscopy), XRF (X-ray fluorescence spectroscopy), XRD (X-ray diffraction spectroscopy), SEM (scanning electron microscopy), Brunauer–Emmett–Teller (BET)/Barrett–Joyner–Halenda (BJH) Method, and TGA (thermogravimetric analysis) were used for the characterization and evaluation of the sorbents’ properties. The adsorptive removal of PNAN and NB from aqueous solutions by MgFZBFA and MgMZBFA were investigated. Various parameters such as pH, adsorbent dosage, initial sorbate concentration were optimized during the adsorption experiment to achieve best performance. Adsorption isotherm, kinetics and dynamics were studied. It was found that Langmuir adsorption isotherm model better represents the adsorption processes and that the processes follow pseudo-second-order kinetics. More so, the sorption processes were most possibly completed by both surface sorption (liquid-film diffusion) and intra-particle diffusion. The maximum sorption capacities observed with MgFZBFA for PNAN and NB are 30.86 mg g−1 and 19.92 mg g−1, while with MgMZBFA the values are 12.72 mg g−1 and 10.20 mg g−1, respectively. The performances of MgFZBFA and MgMZBFA for the sorption of PNAN and NB were compared with some adsorbents previously studied for the same purpose, and results show that the adsorbents in the present study exhibit better performances. The application as materials of cheap source for the removal of PNAN and NB from contaminated water could be considered.

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“…Be that as it may, most works on the use of these functional nanomaterials have focused on their application for sensors specifically oxygen sensing 6–8 , drug delivery 9–13 but little works have been reported for multifunctional superparamagnetic nanoparticles as adsorbents for water treatment especially for dye removal from wastewater. Actually, different adsorbents including montmorrillonite, carbon nanotubes 14 , clay 15 , fly ash, activated carbon 16 etc. have been employed for the removal of dyes from aqueous solution but encounters like inability to separate them from solution, generation of secondary pollutants, cost and unavailability are obvious challenges that limit their usage as adsorbents for the removal of dyes from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Multiple nitrogen functionalized magnetic nanoparticles as an efficient adsorbent: synthesis, kinetics, isotherm and thermodynamic studies for the removal of rhodamine B from aqueous solution

Ojemaye¹,

Okoh

2019

Sci Rep

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The continuous demand for clean and affordable water needed for the survival of man is now a major challenge globally. Therefore, the treatment of wastewater generated from printing, textile and dyeing industries containing soluble dyes like rhodamine B (Rh-B) is of utmost important. This study investigates the efficiency of new multifunctionalized superparamagnetic nanoparticles (MNP-Tppy) for the removal of cationic Rh-B from aqueous solution. To afford MNP-Tppy, the surface of MNP was covalently functionalized with terpyridine ligand to enable an anionic charge on the adsorbent. The results of characterization including Brunauer-Emmett-Teller (BET) analysis, thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), scanning electron microscope (SEM) and fourier transform infra–red spectroscopy (FTIR) indicate that this superparamagnetic nanoparticle functionalized with multiple nitrogen atoms was successfully synthesized. Adsorption experiments involving the effect of pH, time, temperature, adsorbent dose and adsorbate concentration show that the maximum adsorption of Rh-B using MNP-Tppy was observed at pH 9 and removal was observed to increase as solution pH increases. Similarly, time variation shows that adsorbate removal increases as adsorption time increases until the removal attained equilibrium at 15 min. Kinetic studies conducted among four kinetic models using the data obtained from effect of time indicate that the adsorption process can best be described by the pseudo-second order model. Isotherm studies conducted at three different temperatures revealed that Langmuir isotherm model fitted well for the equilibrium data with q m value of 113.64 mg g −1 and thermodynamic studies showed that the adsorption process involving the removal of Rh-B from aqueous solution by MNP-Tppy is spontaneous, endothermic and realistic in nature. Lastly, Reusability experiments indicate that MNP-Tppy can be regenerated and re-used.

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Characterization and Modification of a Clay Mineral Used in Adsorption Tests

Cited by 7 publications

References 35 publications

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

Multiple nitrogen functionalized magnetic nanoparticles as an efficient adsorbent: synthesis, kinetics, isotherm and thermodynamic studies for the removal of rhodamine B from aqueous solution

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