Residual aluminium in water defluoridated using activated alumina adsorption – Modeling and simulation studies

George, Suja; Pandit, Prabhat; Gupta, Akhilendra Bhushan

doi:10.1016/j.watres.2010.02.028

Cited by 100 publications

(37 citation statements)

References 11 publications

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“…Aluminum is neurotoxic in nature, and residual aluminum in drinking water has been reported by researchers (George et al 2010). Keeping this fact in mind, affinity of calcium and magnesium ions towards fluoride has been explored in form of adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Mondal

George

2015

Water Air Soil Pollut

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In many parts of the world, fluoride in drinking water is responsible for notable public health issues. The present study is aimed to prepare a new adsorbent magnesia-hydroxyapatite (Mg-HAP) that can serve as a valuable defluoridating agent. Characterization of the synthesized adsorbent was done by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Transmission electron microscope (TEM), and Scanning electron microscope (SEM)/Energy-dispersive X-ray spectroscopy (EDX) analysis to reveal the bonding patterns, phase characteristics, and microstructural and morphological details. The influences of pH, adsorbent dose, contact time, and initial fluoride concentration and the effect of interfering anions were studied. The defluoridation capacity was evaluated to be 1.4 mg/g, and the adsorbent showed very good capability to remove fluoride from contaminated water over a wide range of pH. Equilibrium modeling was done, and the experimental data was fitted into Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. Study of the kinetic data for the adsorption process revealed that it follows pseudo-second-order reaction. It also indicated that the intraparticle diffusion contributes to the rate-determining step in the process. The quality of treated water was analyzed for total dissolved solids (TDS), turbidity, residual calcium, residual phosphorus content, electrical conductivity, hardness, and total alkalinity. The results obtained were very promising and confirmed the prospects of usage of Mg-HAP in defluoridation of drinking water.Abbreviations q e Amount of adsorption at equilibrium (mg/g) q t Amount of adsorption at time t (mg/g) C 0 Initial concentrations of fluoride (mg/L) C e Equilibrium concentrations of fluoride (mg/L) C t Concentration of fluoride at time t (mg/L) vVolume of the aqueous solution (L) m Adsorbent mass (g) Q 0 Maximum adsorption capacity reflecting complete monolayer (mg/g) R L Separation factor depicting favorability of the process bLangmuir constant related to energy K f Freundlich constants (mg/g) N Heterogeneity factor R Universal gas constant (8.314 J/mol K) T Temperature (K) A T Temkin isotherm equilibrium binding constant (L/g) B T Temkin isotherm constant b 1 Adsorption rate constant of first order reaction (min −1 ) b 2 Adsorption rate constant of first order reaction (g mg −1 min −1 ) k i Intraparticle diffusion rate constant (mg g −1 min −1/2 ) a Initial adsorption rate (mg g −1 min −1 ) α Desorption rate (g mg −1 ) Water Air Soil Pollut (2015) 226:241

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Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Mondal

George

2015

Water Air Soil Pollut

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“…Although there are commercial bone chars and activated aluminas available for the removal of this specific pollutant [20][21][22][23], these adsorbents lack an appropriate cost-performance trade-off.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Synthesis of denim waste-based adsorbents and their application in water defluoridation

Mendoza-Castillo

Reynel-Ávila

Bonilla-Petriciolet

et al. 2016

Journal of Molecular Liquids

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This study evaluates the application of denim fiber scraps as a precursor for the synthesis of adsorbents for water treatment via pyrolysis and their application in water defluoridation. The best pyrolysis conditions for the synthesis of this novel adsorbent have been identified and a metal doping route with different salts of Al 3+ , La 3+ and Fe 3+ was proposed to improve its fluoride adsorption behavior. Different spectroscopic and microscopic techniques (i.e., FTIR, XPS, XRF, SEM) were used to characterize the precursor and adsorbents, and to analyze the surface interactions involved in the fluoride removal mechanism. Experimental results showed that these adsorbents were effective for fluoride adsorption showing uptakes up to 4.25 mg/g. The Si-Ometal-F interactions appear to be highly relevant for the fluoride removal. This study highlights the potential of denim textile waste as a raw material for the production of added-value products, thus minimizing their associated disposal cost. It also highlights the performance of denim textile waste as a precursor of adsorbents for addressing relevant environmental concerns such as fluoride pollution.

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“…Aluminum ions get solubilized from the surface of alumina in presence of high fluoride ions in water and variation in pH causes the dissolution of more aluminium ions into the treated water. Residual aluminum ranging from 2.01 to 6.86 mg/L was reported in nalgonda technique and 0.16 to 0.45 mg/L was reported from AA process (George et al 2010) which is a commonly used household process in areas of endemic fluorosis mostly in rural areas. The permissible limit of aluminum in drinking water is 0.2 mg/L (WHO, 2004).…”

Section: Leaching Of Metal Ions From Adsorbents Into Drinking Watermentioning

confidence: 99%

A review on adsorbents used for defluoridation of drinking water

Mondal

George

2014

Rev Environ Sci Biotechnol

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Drinking water has been contaminated over decades with some very detrimental compounds such as fluoride. Exposure to fluoride through drinking water above the permissible limit (1.0-1.5 mg/L) causes severe dental and skeletal fluorosis. Adsorption technique which deals with adsorbents for fluoride removal from an aqueous solution is a highly efficient and selective process. This review paper provides insights on adsorbents used and developed by researchers for defluoridation of drinking water. It includes various categories of adsorbents used and parameters affecting the whole process. Adsorbents studied by researchers are enlisted with their adsorption capacity, optimum pH, temperature, equilibrium isotherm, kinetics, interfering ions, thermodynamic studies and regeneration procedure adapted. Efforts are needed to develop low cost reusable adsorbents with high adsorption capacity. Although, some adsorbents are reported to show remarkable capacity for fluoride removal; still there is an urgent need for development of more novel adsorbents holding both economic and technological benefits.

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Residual aluminium in water defluoridated using activated alumina adsorption – Modeling and simulation studies

Cited by 100 publications

References 11 publications

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Synthesis of denim waste-based adsorbents and their application in water defluoridation

A review on adsorbents used for defluoridation of drinking water

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