Fluoride Adsorption by Pumice from Aqueous Solutions

Mahvi, Amir Hossein; Heibati, Behzad; Mesdaghinia, Alireza; Yari, Ahmad Reza

doi:10.1155/2012/581459

Cited by 32 publications

(26 citation statements)

References 30 publications

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“…One reason for this phenomenon is due to increasing of phosphorous transfer from solution to the surface of adsorbent particles, resulting in the increase of the mass transfer driving force between solid and liquid phases and higher free bands of adsorbent in lower concentration of phosphorous [45,46]. These results are in good agreement with other results obtained in phosphorous adsorption onto coir pith [47] and slag [48].…”

Section: Effect Of Agitation Time and Initial Phosphorous Concentrationsupporting

confidence: 89%

Trends of natural and acid-engineered pumice onto phosphorus ions in aquatic environment: adsorbent preparation, characterization, and kinetic and equilibrium modeling

Safari

Zarrabi

Hoseini

et al. 2014

Desalination and Water Treatment

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A B S T R A C TThe objective of this study was to investigate the potential of natural and acid-modified pumice as an adsorbent in phosphorous removal from aqueous solution. Various experimental parameters such as initial phosphorous concentration, adsorbent dosage, contact time, and pH were investigated. The most common isotherms and the kinetic adsorption models were used for survey of phosphorous adsorption mechanism. Results indicated that pH plays a significant role in the adsorption of phosphorous. The adsorption capacity increased with increase in contact time and initial phosphorous concentration and after 30 and 45 min, reached equilibrium for modified and natural pumice, respectively. Maximum adsorption of phosphorous (9.74 mg/g) was obtained in the pH ranging from 5 to 7, pumice dosage of 2 g/L, and contact time of 30 min using the modified pumice. Further increase of adsorbent dosage over 2 g/L didn't have significant effect on the phosphorous adsorption. The experimental results showed that absorption process and equilibrium data were well fitted using the pseudo-second-order kinetic model (R 2 > 0.99) and Langmuir No 2 isotherm (R 2 > 0.99). The foreign anions such as Cl − , NO 3 − , SO 4 2− , and HCO 3 − didn't have noticeable effects on the phosphorous adsorption. In general, the adsorption capacity of acid-modified pumice in the same conditions is more than natural pumice (55-60%). As general conclusion; modified pumice can be used successfully as low-cost and effective absorbent for phosphorous removal from aqueous solution.

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Section: Effect Of Agitation Time and Initial Phosphorous Concentrationsupporting

confidence: 89%

Trends of natural and acid-engineered pumice onto phosphorus ions in aquatic environment: adsorbent preparation, characterization, and kinetic and equilibrium modeling

Safari

Zarrabi

Hoseini

et al. 2014

Desalination and Water Treatment

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“…The isotherms of MB on MPS were found to be linear for the entire concentration range studies and the correlation coefficients were extremely high (R 2 > 0.99) as shown in Table 3. As Table 3 shows, the maximum adsorption capacity of the MPS in the Langmuir model was obtained as 15.87 mg/g which is considered as a favorable rate compared to other similar studies (Table 4) (29)(30)(31)(32). The Freundlich isotherm (33) is derived by assuming a heterogeneous surface with a non-uniform distribution of sorption heat over the surface.…”

Section: Dubinin-radushkevichmentioning

confidence: 70%

“…To analyze the adsorption kinetics of the dye, the pseudo-first-order, the pseudosecond-order, and intra-particle diffusion models were applied (38,39). Each of these models and their linear modes of theme are shown in Table 5 (2,31). In the equations presented in Table 5, q e and q t refer to the amount of dye adsorbed (mg/g) at equilibrium and at any time, t (min), respectively and K 1 (1/min), K 2 (g/mg.min) are the equilibrium rate constants of pseudo-first order and pseudo-second order models, respectively.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption of Methylene Blue Dye from Aqueous Solutions by Modified Pumice Stone: Kinetics and Equilibrium Studies

et al. 2013

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Background: Dyes are one of the most important industrial pollutants, especially in textile industries. Many methods have been proposed in order to remove color from wastewater among which, adsorption is more acceptable due to the ability for its use in the large scale. Objectives: The objective of this study was to investigate pumice as an inexpensive adsorbent for removal of Methylene Blue from aqueous solutions. Materials and Methods:In this work the Modified Pumice Stone has been applied for removal of the Methylene Blue dye from aqueous environments. The effect of pH, contact time, initial concentration and amount of adsorbent were considered. In order to investigate the mechanism of the adsorption process, several kinetic models including pseudo-first order, pseudo-second order and intra-particle diffusion were used. In addition, equilibrium data was fitted on to Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models. Results: Results showed that the adsorption of the Methylene Blue was enhanced with increasing initial dye concentration, pH and contact time. The optimum pH was 10. The q max for adsorption of methylene blue dye from the Langmuir model was 15.87 mg/g. Considering the values of R 2 (0.999) and χ 2 , Freundlich isotherm model and pseudo-second order kinetic model had the best fitness. Conclusions:This study has demonstrated that the modified Pumice stone with HCl can be employed as effective and inexpensive adsorbent for the removal of Methylene Blue from aqueous environments.

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“…Effects of phosphate on fluoride removal were also reported by [146]. The tendency of the anions to form inner-sphere complexes was reported by [28,29,32,63,170,174,175,177,178,[180][181][182][183]. Chloride ions formed outer-sphere surface complexes and had a minor effect on fluoride adsorption; thus they are less absorbed on the absorbent surface [65].…”

Section: Effects Of Anion Cation and Organicmentioning

confidence: 79%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Fluoride Adsorption by Pumice from Aqueous Solutions

Cited by 32 publications

References 30 publications

Trends of natural and acid-engineered pumice onto phosphorus ions in aquatic environment: adsorbent preparation, characterization, and kinetic and equilibrium modeling

Trends of natural and acid-engineered pumice onto phosphorus ions in aquatic environment: adsorbent preparation, characterization, and kinetic and equilibrium modeling

Adsorption of Methylene Blue Dye from Aqueous Solutions by Modified Pumice Stone: Kinetics and Equilibrium Studies

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

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