Defluoridation from aqueous solutions by granular ferric hydroxide (GFH)

Bhatnagar, Amit; Ji, Min-Kyu; Jung, Woo‐Sik; Kim, Sun Joon; Lee, Giehyeon; Song, Hocheol; Choi, Jae Young; Yang, Jung‐Seok; Jeon, Byong‐Hun

doi:10.1016/j.watres.2008.10.031

Cited by 263 publications

(95 citation statements)

References 46 publications

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“…Different adsorbents such as activated alumina [15], bleaching earth [16], iron oxide [17], activated titanium rich bauxite [18], activated carbon [19], red mud [20], and clay [21,22] were tested to find out efficient and economically viable defluoridating ones. Among these adsorbents, clay and clay minerals are naturally abundant, renewable, and environmentally sustainable [23][24][25].…”

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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“…Continuous operations Tahaikta et al (2008) 30 Defluoridation chemistry of synthetic hydroxyl apatite at nano scale: Equilibrium and kinetic studies Sairam Sundaram et al (2008a, b) 31 Defluoridation of wastewaters using waste carbon slurry Gupta et al (2007) 32 Sorptive response profile of an adsorbent in the defluoridation of drinking water Ayoob and Gupta (2007) 33 Uptake of fluoride by nano-hydroxyapatite/chitosan, a bioinorganic composite Sairam Sundaram et al (2008a, b) 34 Role of metal ion incorporation in ion exchange resin on the selectivity of fluoride 35 Electrodialytic removal of fluoride from water: Effects of process parameters and accompanying anions Erdem Ergun et al (2008) 36 Removal of fluoride from aqueous solution using protonated chitosan beads 37 Development of multifunctional chitosan beads for fluoride removal Viswanathan et al (2009c) 38 Sorption behaviour of fluoride on carboxylated cross-linked chitosan beads 39 Enhanced fluoride sorption using La(III) incorporated carboxylated chitosan beads Viswanathan and Meenakshi (2008) 40 Treatment of fluoride containing drinking water by electrocoagulation using monopolar and bipolar electrode connections Ghosh et al (2008) 41 Defluoridation from aqueous solutions by granular ferric hydroxide (GFH) Kumar et al (2009) …”

Section: Sáno Methodsmentioning

confidence: 99%

A study on the defluoridation in water by using natural soil

et al. 2013

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Removal of excess fluoride (F -) from the water has been attempted by several authors by using different materials both natural and artificial. The main aim of this paper was to attempt the fluoride removal by using the locally available red soil adopting column method. The red soil was mixed in different proportion with sand in order to increase the porosity and permeability property of the medium. It was optimized for 4:1 ratio of red soil to sand and it was used for the following experiment. The experiment was conducted in 11 batches for a period of about 9,213 min. Fresh standard solution of F was used in each batch, prepared from Orion 1,000 ppm solution. The samples were collected and analyzed for pH, EC (Electrical Conductivity) and HCO 3 . Rate of flow of water and efficiency of adsorption were calculated and compared with the fluoride removal capacities of the medium. The medium used for the fluoride removal was subjected to FTIR analysis before and after the experiment. The variation of IR spectrum before and after treatment signifies the changes in the OH bonding between Al and Fe ions present in the soil. The variation in pH decreased during the course of defluoridation. Higher F removal was noted when flow rate was lesser. An attempt on the regeneration of the fluoride adsorbed soil was also made and found to be effective.

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“…There are four sequential steps in the sorption of metals onto porous and granular media (1) diffusion through a bulk solution, (2) film diffusion, (3) intraparticle diffusion, and (4) sorption onto a solid surface (Kumar et al, 2009). If intraparticle or pore diffusion is involved in the sorption of metals, the relationship between the sorbed amount of metals and square root of time would be linear.…”

Section: Effect Of Spider Silk Dose and Agitation Time On Biosorptionmentioning

confidence: 99%

“…For Pb(II) and Cu(II), distinctly differed regions are observed in the plots. The first part may be governed by the initial intraparticle transport of metals controlled by the surface diffusion process while the next part may be controlled by pore diffusion (Kumar et al, 2009). Sorption capacity of the SS for Cu(II) and Pb(II) were calculated from the pseudo-second-order model being 18.87 mg g À1 (0.30 mmol g À1 ) and 2.53 mg g À1 (0.012 mmol g À1 ) respectively.…”

Section: Effect Of Spider Silk Dose and Agitation Time On Biosorptionmentioning

confidence: 99%

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

Pelit

Ertaş

Eroğlu

et al. 2011

Bioresource Technology

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a b s t r a c tAside from its excellent mechanical properties, spider silk (SS) would offer an active surface for heavy metal interaction due to its rich protein structure. The present study describes the potential use of natural (SS) as a sorbent of heavy metals from aqueous solutions. Single and multi-species biosorption experiments of heavy metals by natural SS were conducted using batch and column experiments. The biosorption kinetics, in general, was found to follow the second-order rate expression, and the experimental equilibrium biosorption data fitted reasonably well to Freundlich isotherm. From the Freundlich isotherm, the biosorption capacities of Cu(II) and Pb(II) ions onto SS were found as 0.20 and 0.007 mmol g -1 , respectively. The results showed a decrease in the extent of metal ion uptake with lowering the pH.

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Defluoridation from aqueous solutions by granular ferric hydroxide (GFH)

Cited by 263 publications

References 46 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

A study on the defluoridation in water by using natural soil

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

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