Equilibrium and Kinetic Studies for Fluoride Adsorption from Water on Zirconium Impregnated Coconut Shell Carbon

Sathish, R. Sai; Raju, N. S. R.; Raju, Ganji Seeta Rama; Rao, Guo‐Wu; Kumar, Kaushlendra; Janardhana, Ch.

doi:10.1080/01496390601070067

Cited by 97 publications

(31 citation statements)

References 19 publications

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“…Activated coconut shell carbon (Arulanantham et al 1989), zirconium-impregnated ground nut shell carbon (Alagumuthu and Rajan 2010a), zirconium-impregnated coconut shell carbon (Sai sathish et al 2007), Dolichos lablab carbon (Rao et al 2009), zirconium-impregnated cashew nut shell carbon (Alagumuthu and Rajan 2010b), Phyllanthus emblica-activated carbon , Acacia farnesiana carbon (Kishore and Hanumantharao 2011), Moringa indica-activated carbon (Karthikeyan and Siva Elango 2007), Cynodon dactylon-activated carbon , Typha angustata-activated carbon (Hanumantharao et al 2012a), Pine wood and Pine bark chars (Mohan et al 2012), and activated carbon derived from steam pyrolysis of rice straw (Daifullah et al 2007) have been explored for their adsorption nature towards fluoride. These techniques suffer from one or the other drawbacks, and a universally accepted, simple, eco-friendly and economical methods are still alluding researchers.…”

Section: Introductionmentioning

confidence: 99%

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

2015

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Background: Deleterious effects of fluoride contamination in ground waters on the health of human beings are well known and intensive research on developing de-fluoridation methods is globally pursued. Of the various methodologies, increasing interest is being envisaged in using the adsorption methods based on active carbons derived from plant material. In the present investigation, Nitric acid activated carbon derived from barks of Vitex negundo plant (NVNC) is probed for its de-fluoridation abilities. Methods: The activated carbon is characterized adopting various physicochemical methods and surface morphological studies are carried out using FT-IR and SEM-EDX techniques. The effect of various parameters such as pH, sorbent dosage, agitation time, initial concentration of fluoride, temperature, particle size and presence of foreign ions on the extraction of the fluoride is studied adopting Batch methods.The adsorption process is analyzed with Freundlich, Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherms and kinetics of adsorption is studied using pseudo first-order, pseudo second-order, Weber and Morris intraparticle diffusion, Bangham's pore diffusion and Elovich equations. The methodology developed is applied to real ground water samples.

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Section: Introductionmentioning

confidence: 99%

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

2015

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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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“…Although direct comparison of the calixpyrrole with other materials [36][37][38][39][40][41] is difficult owing to the different applied experimental conditions, it was found, in general, that the removal capacity of the calixpyrrole (0.4 mg/g) for fluoride ions is comparable with that of other materials and in fact greater than certain adsorbents (Table 4). It is well known that the properties of an ion in a solution are determined mainly by ion-solvent and ion-ion interactions [42,43].…”

Section: Comparison With Alternative Materialsmentioning

confidence: 97%

Calix[4]pyrrole macrocycle: Extraction of fluoride anions from aqueous media

2012

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KEYWORDSSolid-phase extraction of fluoride anions by calixpyrrole macrocycle (CP) from aqueous media has been studied using the batch method. Various significant extraction parameters like initial concentration of the anion, extraction time, concentration of the calixpyrrole, pH and temperature were evaluated. Langmuir, Freundlichand, Dubinin-Redushkevish (D-R) isotherms and coefficients were used to analyze the equilibrium data. The amount of fluoride anion extracted per unit of the CP was found to be 0.40 mg/g at 298 K from 19 mg/L aqueous solution of fluoride anions. The mean free energy calculated from D-R model for the removal of fluoride anions by the CP was found to be 10.0 kJ/mol, indicating that chemisorption is involved in the extraction process. The data were also fitted to kinetic models such as pseudo first order and pseudo second order. The removal of fluoride anions increased with increasing temperature indicating the endothermic nature of the extraction process. The present method has been compared with the previous methods.

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Equilibrium and Kinetic Studies for Fluoride Adsorption from Water on Zirconium Impregnated Coconut Shell Carbon

Cited by 97 publications

References 19 publications

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

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

Calix[4]pyrrole macrocycle: Extraction of fluoride anions from aqueous media

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