Removal of fluoride from drinking water using aluminum hydroxide coated rice husk ash

Ganvir, Vivek; Das, Kalyan Kumar

doi:10.1016/j.jhazmat.2010.10.044

Cited by 183 publications

(73 citation statements)

References 15 publications

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“…Such trend of removal might be attributed to the positive charged surface of both SFP and CCSFP at acidic pH conditions to which fluoride got easily bound. Similar observation was made by Ganvir and Das (2011) and Yadav et al (2013). pH zpc of SFP and CCSFP were found to be 7.0 and 8.2, respectively.…”

Section: Effect Of Phsupporting

confidence: 87%

“…Fluoride is usually present in the rock minerals as fluorspar, fluorapatite, mica, etc., . In groundwater, high fluoride concentration generally occurs due to physical and geological structure of aquifers (Ganvir and Das 2011). The geochemistry of high fluoride in groundwater depends on low calcium concentration and alkaline condition (pH 7.6-8.6), which are favorable for dissolution of fluorite mineral from the host rocks (Weinstein and Davison 2004).…”

Section: Introductionmentioning

confidence: 99%

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Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

et al. 2017

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Fluoride pollution in groundwater is a major concern in rural areas. The flower petal of Shorea robusta, commonly known as sal tree, is used in the present study both in its native form and Ca-impregnated activated form to eradicate excess fluoride from simulated wastewater. Response surface methodology (RSM) was used for experimental designing and analyzing optimum condition for carbonization vis-à-vis calcium impregnation for preparation of adsorbent. During carbonization, temperature, time and weight ratio of calcium chloride to sal flower petal (SFP) have been considered as input factors and percentage removal of fluoride as response. Optimum condition for carbonization has been obtained as temperature, 500°C; time, 1 h and weight ratio, 2.5 and the sample prepared has been termed as calcium-impregnated carbonized sal flower petal (CCSFP). Optimum condition as analyzed by one-factor-at-a-time (OFAT) method is initial fluoride concentration, 2.91 mg/L; pH 3 and adsorbent dose, 4 g/L. CCSFP shows maximum removal of 98.5% at this condition. RSM has also been used for finding out optimum condition for defluoridation considering initial concentration, pH and adsorbent dose as input parameters.The optimum condition as analyzed by RSM is: initial concentration, 5 mg/L; pH 3.5 and adsorbent dose, 2 g/L. Kinetic and equilibrium data follow Ho pseudo-secondorder kinetic model and Freundlich isotherm model, respectively. Adsorption capacity of CCSFP has been found to be 5.465 mg/g. At optimized condition, CCSFP has been found to remove fluoride (80.4%) efficiently from groundwater collected from Bankura district in West Bengal, a fluoride-contaminated province in India. Adsorption rate constant of pseudo-second-order adsorption rate equation (g mgMaximum adsorption capacity of the adsorbent (mg/ g) q eSolid phase concentration of fluoride at equilibrium (mg/g) q tSolid phase concentration of fluoride at any time t (mg/g) DS Change in entropy (kJ/mol K) t Contact time (h)Electronic supplementary material The online version of this article

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Section: Effect Of Phsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

et al. 2017

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“…Though fluoride in minute amounts is an essential component for bones and for the formation of dental enamel in animals and humans (Grynpas et al 2000;Jackson et al 1973;Fawell et al 2006;Kumar and Moss 2008;Underwood 1997), its high concentration cause irreversible demineralization of bones and tooth tissues which is known as dental and skeletal fluorosis, damage to the brain, liver, and kidney, headache, skin rashes, bone cancer, and even death in extreme cases (Susheela 2001;Barbier et al 2010;Gazzano et al 2010;Ayoob and Gupta 2006;Chaturvedi et al 1990;Wang and Reardon 2001;Lounici et al 1997;Srimurali et al 1998;Savinelli and Black 1958;Ganvir and Das 2011;Chinoy 1991). The maximum permissible limit of fluoride in water is 1.5 mg/l as per WHO standards (WHO 1984(WHO , 2004BIS 1991).…”

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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“…Such materials include: hydroxyl apatite, calcite, fluorspar, quartz, 17 flyash, 18 silica gel, 19 bone char, 20 spent catalyst, 21 zeolites, 22 red mud, 23 bentonite, 24 clay chips, 25 lateritic soils, 26 nano-alumina, 27 aluminum hydroxide coated rice husk ash, 28 waste mud, 29 diatomaceous earth and other related materials. 30,31 However, the applicability of these low cost methods is limited either due to their low efficiency or lack of public acceptance.…”

Section: Introductionmentioning

confidence: 99%

Defluoridation of Water Using Tamarind (Tamarindus Indica) Fruit Cover: Kinetics and Equilibrium Studies

Kumar

Krishnaiah

2012

J. Chil. Chem. Soc.

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In the present study defluoridation of water was conducted using Tamarind fruit cover (TNFC) as a natural adsorbent in virgin and acid treated forms. Defluoridation of water was studied under batch equilibrium and column flow experimental conditions. The adsorbents were characterized by FTIR, SEM, Pycnomatic ATC techniques. The effect of experimental variables such as initial concentration of fluoride, effect of pH, contact time, co-ions and amount of adsorbent dosage was evaluated. The study was also extended to real field water samples. The equilibrium data were used to study the kinetics of defluoridation process and also to predict the isotherms applicable to the adsorption process. The maximum monolayer adsorption capacity of virgin TNFC and treated TNFC sorbents as obtained from the Langmuir adsorption isotherm was found to be 4.14 mg/g and 6.11 mg/g of fluoride. The column flow adsorption data were utilized to obtain break through curves.

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Removal of fluoride from drinking water using aluminum hydroxide coated rice husk ash

Cited by 183 publications

References 15 publications

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

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

Defluoridation of Water Using Tamarind (Tamarindus Indica) Fruit Cover: Kinetics and Equilibrium Studies

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