Fluoride removal from groundwater by nanofiltration

Tahaikt, M.; Habbani, R. El; Haddou, A. Ait; Achary, I.; Amor, Z.; Taky, Mohamed; Alami, Abdul Hai; Boughriba, A.; Hafsi, M.; Elmidaoui, A.

doi:10.1016/j.desal.2006.10.003

Cited by 185 publications

(57 citation statements)

References 10 publications

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“…Concentration higher than this value can lead to fluorosis (dental and/or skeletal) and several types of neurological damage in severe cases [5]. Many methods have been developed for fluoride removal from water such as adsorption [6], ion exchange [7], membrane processes such as reverse osmosis and nanofiltration [8,9], electrodialysis [10,11], and precipitation [12]. Among these methods, adsorption is a widely used method for defluoridation which depends on ions (adsorbate) in fluid diffusing to the surface of a solid (adsorbent) when they are bound to the solid surface or are held there by weak intermolecular forces [13].…”

Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

Kofa

Gomdje

Telegang

et al. 2017

Journal of Applied Chemistry

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Excessive fluoride in potable water is a serious health problem in rural areas of many developing countries. Hence, there is a need to find a simple and cost-effective method for water defluoridation in such areas. In the northern part of Cameroon, clay pots are used for cooking food and water storage. The firing of these pots consists of intensive burning using fire wood. They were tested as a potential adsorbent for removing excess fluoride from water. Experiments were carried out in a jar test at room temperature (25 ± 2 ∘ C). Effects of contact time (0-90 min), pH (4, 5, 7, 8, and 9), stirring speed (60, 90, 120, and 200 rpm), and ionic strength (0-1000 mg/L) were investigated. Results showed that equilibrium was attained in 10 min whatever the pH. Pseudo-second-order and pore diffusion models described well the adsorption process. The highest amount of fluoride adsorbed (1.6 mg/g) was obtained at pH 4-5 and the optimum stirring speed is 120 rpm. Ionic strength has a significant effect on fluoride adsorption.

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Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

Kofa

Gomdje

Telegang

et al. 2017

Journal of Applied Chemistry

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“…However, the concentration of fluoride ion in groundwater is higher than 1.5 mg L À1 in many areas throughout the world. Fluoride removal techniques mainly include chemical precipitation (He and Cao, 1996), membrane processes (Tahaikt et al, 2007), adsorption (Maliyekkal et al, 2006;Wu et al, 2007), and ion exchange (Meenakshi and Viswanathan, 2007). Adsorption is effective in defluoridation, but its operation is complex.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

et al. 2011

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a b s t r a c tAn integrated electro-oxidation and electrocoagulation system was designed and used to remove As(III) and F À ions from water simultaneously. Dimensionally stable anodes (DSA), Fe electrodes, and Al electrodes were combined into an electrochemical system. Two pieces of DSA electrodes were assigned as the outside of the Fe and Al electrodes and were directly connected to the power supply as anode and cathode, respectively. The Fe and Al ions were generated by electro-induced process simultaneously. Subsequently, hydroxides of Fe and Al were formed. Arsenic ions are mainly removed by iron hydroxides and F À ions are mainly removed by the Al oxides. At the initial concentration of 1.0 mg L À1 , most of As(III) was transferred into As(V) within 40 min at current density of 4 mA cm À2 , whereas F À ions can be efficiently removed simultaneously. The effect of the ratio of Fe and Al plate electrodes and current density on the removal of As(III) and F À was investigated. With one piece of Fe plate electrode and three pieces of Al plate electrodes, it is observed that As(III) with concentration of 1 mg L À1 and F À with concentration of 4.5 mg L À1 can be removed and their final concentrations were below the values of 10 lg L À1 and 1.0 mg L À1 , respectively within 40 min. Removal efficiency of As(III) increases with the increase of solution pH. However, in the pH range of 6-7, removal efficiency of F À is the largest.

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“…In addition to serving as sorbent for organic and inorganic contaminants, current technology has used CNTs as nanofilters to reduce particle concentrations in waste water (Srivastava et al, 2004;Jin et al, 2007;Tahaikt et al, 2007). Similar to sorbents, specific selectivity on CNTs filters can be manipulated through the attachment of different functionalities at the pore entrances (Fornasiero et al, 2008).…”

Section: Carbon Nanotubes In Waste Water Treatmentmentioning

confidence: 99%

A review on carbon nanotubes in an environmental protection and green engineering perspective

Ong¹,

Ahmad²,

Zein³

et al. 2010

Braz. J. Chem. Eng.

170

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-Recent developments in nanotechnologies have helped to benchmark carbon nanotubes (CNTs) as one of the most studied nanomaterials. By taking advantages of CNTs extraordinary physical, chemical and electronic properties, a wide variety of applications has been proposed in various engineering fields. In this short review, the contribution of CNTs is addressed in terms of sustainable environment and green technologies perspective, such as waste water treatment, air pollution monitoring, biotechnologies, renewable energy technologies, supercapacitors and green nanocomposites. Consideration of CNTs for large scale application from the aspect of cost and potential hazards are also discussed. Based on the literature studied, CNTs pose a great potential as a promising material for application in various environmental fields.

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Fluoride removal from groundwater by nanofiltration

Cited by 185 publications

References 10 publications

Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

A review on carbon nanotubes in an environmental protection and green engineering perspective

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