Removal of excess fluoride ions from Saharan brackish water by adsorption on natural materials

Ramdani, Amina; Taleb, Safia; Benghalem, A.; Ghaffour, Noreddine

doi:10.1016/j.desal.2009.09.066

Cited by 87 publications

(32 citation statements)

References 20 publications

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“…The enthalpy values indicated the possible domination of physical forces [82] in the present fluoride sorption system. The reports by various researchers are in agreement with the present fluoride sorption system [18,[83][84][85][86]. The increase in the randomness may be associated with the fact that the adsorbed water molecules which are displaced by the adsorbate (fluoride) species gain more translational entropy which allows the prevalence of randomness in the system [82].…”

Section: Thermodynamic Parameterssupporting

confidence: 84%

Surface modification of pumice enhancing its fluoride adsorption capacity: An insight into kinetic and thermodynamic studies

Sepehr

Sivasankar

Zarrabi

et al. 2013

Chemical Engineering Journal

123

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Section: Thermodynamic Parameterssupporting

confidence: 84%

Surface modification of pumice enhancing its fluoride adsorption capacity: An insight into kinetic and thermodynamic studies

Sepehr

Sivasankar

Zarrabi

et al. 2013

Chemical Engineering Journal

123

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“…The qm value obtained in this study is greater than those of reported and the results were compared in Table 2 ( Viswanathan et al, 2009, Meenakshi et al, 2008, Ramdani et al, 2010, Meenakshi and Viswanathan, 2007, Chen et al, 2011, Islam et al, 2011, Sairam Sundaram et al, 2009, Ma et al, 2007, Chang et al, 2006.…”

Section: Adsorption Isothermscontrasting

confidence: 49%

A new adsorbent for fluoride removal: The utilization of sludge waste from electrocoagulation as adsorbent

2015

Global NEST Journal

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This work investigated the potential of calcined electrocoagulation sludge (CES) within metals hydroxide generated during removal of boron using Al electrode for adsorption of fluoride from aqueous solution. The effects of contact time, pH of the solution (2-10), stirrer speed (50-450 rpm), initial concentration (5-100 mg l ), solution temperature (293-333 K) and particle size (0.125-1000 µm) on fluoride removal were investigated. All the experiments were carried out by batch mode. It was found that the maximum adsorption takes place within 2 h at pH 6.0. The adsorption removal increased with increase in the adsorbent dose, but decreased with increase in fluoride concentration. It was found that the adsorption removal decreases with increase in temperature, which showed that the adsorption process was exothermic in nature. The decrease in particle size increased fluoride removal efficiency. The maximum adsorption capacity (qm) increased from 45.5 to 124.6 mg g -1 when the adsorbent dosage was adjusted to 1 instead of 4 g l -1. The Freundlich isotherm and Langmuir isotherm were used to fit the data of equilibrium experiments. The adsorption data fitted well into the linearly transformed Langmuir equation. The efficiency of CES to remove fluoride was found to be 99.99% at pH 6, contact time for 2 h, dose of 4 g l -1, when 25 mg l -1 of fluoride was present in 100 ml of water. Comparison with literature reported values of qm, it was found that CES was an attractive adsorbent.

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“…Recently, many attempts have been made to use waste or low cost materials as the absorbent. The materials studied include bauxite [13], montmorillonite [14], activated water treatment sludge [15], waste mud [16], red mud [17], granular ceramic [18], hydrous iron (III)-tin (IV) mixed oxide [19], and schwertmannite [20].…”

Section: Introductionmentioning

confidence: 99%

Defluoridation with Locally Produced Thai Bone Char

Mutchimadilok

Smittakorn

Mongkolnchai-arunya

et al. 2014

Advances in Environmental Chemistry

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The fluoride sorption ability of a locally available bone char is quantified. Both a synthetic solution and natural groundwater samples from several sites are studied and compared to Indian bone char, which is widely accepted and used successfully in India and elsewhere. The Freundlich and Langmuir sorption isotherms were used to quantify sorption properties. Results show that the Thai bone char is as effective as the Indian bone char for removing fluoride from contaminated water, despite the more rigid physical and social constraints found in rural Thailand. Sorption studies with fluoride-contaminated natural groundwater samples also show that chlorides, nitrates, and sulfates had little effect on the removal of fluoride by the homemade bone char.

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Removal of excess fluoride ions from Saharan brackish water by adsorption on natural materials

Cited by 87 publications

References 20 publications

Surface modification of pumice enhancing its fluoride adsorption capacity: An insight into kinetic and thermodynamic studies

Surface modification of pumice enhancing its fluoride adsorption capacity: An insight into kinetic and thermodynamic studies

A new adsorbent for fluoride removal: The utilization of sludge waste from electrocoagulation as adsorbent

Defluoridation with Locally Produced Thai Bone Char

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