Defluoridation from aqueous solutions by nano-alumina: Characterization and sorption studies

Kumar, Eva; Bhatnagar, Amit; Kumar, Umesh; Sillanpää, Mika

doi:10.1016/j.jhazmat.2010.11.102

Cited by 239 publications

(91 citation statements)

References 47 publications

(38 reference statements)

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“…It was observed that fluoride removal increased with the lapse of time and the rate was initially rapid after which, the rate slowed down as the equilibrium approached. For evaluating the adsorption kinetics of nano-MgO two models are employed, the pseudo-first [39] and the second order [40] models. The pseudo-first order kinetic equation is expressed as:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Defluoridation of water using nano-magnesium oxide

Devi

Umlong

Raul

et al. 2012

Journal of Experimental Nanoscience

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Nano-sized magnesium oxide (nano-MgO) was investigated for adsorption of fluoride from water. The pure and fluoride adsorbed nano-MgO were characterised by Brunauer-EmmettTeller, high resolution transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray analyses. The surface area of the adsorbent was found to be 92.46 m 2 /g. Maximum (90%) fluoride removal was obtained with 0.6 g/L dosage of nano-MgO. Fluoride adsorption by nano-MgO was found to be less sensitive to pH variations. Fluoride sorption was mainly influenced by the presence of OH À ion. The presence of other ions studied did not affect the fluoride adsorption capacity of nano-MgO significantly. It has been observed that Freundlich model was better fitted as compared to Langmuir model which indicated the multilayer adsorption of the adsorbent following a pseudo-second order kinetics. Regeneration study showed that 1 M HCl was the best eluent with 95% desorption capacity towards fluoride removal followed by NaOH (2 M) with 25% regeneration of the adsorbent.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Defluoridation of water using nano-magnesium oxide

Devi

Umlong

Raul

et al. 2012

Journal of Experimental Nanoscience

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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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“…Bhatnagara et al(2010) studied the removal of Nitrate from waters using nanoparticles of alumina and the sorption capacity of the adsorbent was found to be 4.0 mg/g at optimum pH: 4.4 and at 25 ± 2 °C. 52 Kumar et al(2011) used nano-AlOOH as adsorbent for defluoridation studies and found to be effective. 53 …”

Section: Removal Of Metal Ionmentioning

confidence: 99%

“…52 Kumar et al(2011) used nano-AlOOH as adsorbent for defluoridation studies and found to be effective. 53 …”

Section: Removal Of Metal Ionmentioning

confidence: 99%

Nano Aluminum Oxides as Adsorbents in Water Remediation Methods: A Review

2017

RJC

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Nanoparticles of Al2O3, are proving to be versatile adsorbents in the purification of water/waste water in view of their large surface area, high surface energies and potentials and availability of surface functional groups for binding over the pollutants. The conventional physical and/or chemical methods of syntheses are tedious, costly, involve toxic chemicals and not eco-friendly. Hence, using the extracts of plants as reducing, capping or stabilizing agents, the researchers are synthesizing the nanoparticles and these bio-methods are producing nano-particles that are more bio-compatible and endowed with enhanced sorption nature than the nanoparticles conventionally synthesized. Moreover, these methods are simple and depend upon the naturally available non-toxic compounds in the rich flora available in our surroundings and thereby domesticating the complicated syntheses. In the present review, the investigations pertaining to the synthesis of Aluminum oxide nanoparticles with more emphasis on phyto-(green) methods, and their applications to the removal of toxic ions from water, are emphatically reviewed. The less/not trodden potential areas of research are identified in the context of using nanoparticles of Aluminum oxides as adsorbents for developing water remediation methods.

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Defluoridation from aqueous solutions by nano-alumina: Characterization and sorption studies

Cited by 239 publications

References 47 publications

Defluoridation of water using nano-magnesium oxide

Defluoridation of water using nano-magnesium oxide

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

Nano Aluminum Oxides as Adsorbents in Water Remediation Methods: A Review

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