Fluoride removal using lanthanum incorporated chitosan beads

Bansiwal, Amit; Thakre, Dilip; Labhshetwar, Nitin; Meshram, Sarita Gajbhiye; Rayalu, Sadhana

doi:10.1016/j.colsurfb.2009.07.021

Cited by 130 publications

(54 citation statements)

References 25 publications

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“…Figure 9 also indicate initial adsorption is very rapid and slow approach to equilibrium. A similar finding has been reported for removal of fluoride onto lanthanum incorporated chitosan beads 27,29 . In the present study, two main types of kinetic models viz.…”

Section: Effect Of Contact Time and Adsorption Kinetic Modelsupporting

confidence: 88%

“…The extent of percentage of adsorption increased with increase in the adsorbent dose while loading capacity (amount of fluoride adsorbed per g of the adsorbent) gradually decreased for decreasing the number of interaction site between the adsorbent and adsorbate.This is probably due to increase of adsorption sites [28][29] . From the trend it appears that a maximum level (51.3 to 97.6 %) of fluoride adsorption occurs with increase in adsorbent dose from 0.2 to 2.4 g L -1 and then the adsorption is not changed with the adsorbent dose due to establishment of equilibrium condition 27 . Distribution coefficient (K DC ) usually calculated in this study to define the partitioning of an element in a system.…”

Section: Effect Of Particle Size and Adsorbent Dosementioning

confidence: 96%

“…This result shows that removal of fluoride ion is most appreciable in the pH range 2.0-7.0 with a peak value at pH 6.0. This may be explained by considering pH ZPC (Table 1) for the AcTAP because removal of fluoride by adsorption process is highly dependent on solution pH as it can alter the surface charge of the adsorbent 27 . Hence, in the present work, the highest removal capacity was performed at pH 6.0, since pH ZPC = 6.5, the surface will be positively charged.…”

Section: Effect Of Phmentioning

confidence: 99%

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Studies on Defluoridation of Water by Tea Ash:An Unconventional Biosorbent

Mondal¹,

Bhaumik²,

Baur³

et al. 2012

Chem Sci Trans

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Abstract:Residual part of tea as a household waste was effectively used for removal of fluoride from aqueous medium. The variable operating parameters such as pH, initial fluoride concentration, sorbent particle size, agitation time and temperature. The defluoridation capacity increases with increasing adsorbent dose and contact time but decrease with initial concentration of fluoride solution. Moreover, acidic pH (6) showed the highest removal of fluoride. Further defluoridation follows second order kinetics and Langmuir and Freundlich adsorption isotherm. The surface and sorption characteristics were analyzed using FTIR and SEM techniques. For domestic and industrial applications, defluoridation with 100% achievement and subsequent regeneration of adsorbent was performed with a household water filter and fixed bed column respectively.

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Section: Effect Of Contact Time and Adsorption Kinetic Modelsupporting

confidence: 88%

Section: Effect Of Particle Size and Adsorbent Dosementioning

confidence: 96%

Section: Effect Of Phmentioning

confidence: 99%

See 1 more Smart Citation

Studies on Defluoridation of Water by Tea Ash:An Unconventional Biosorbent

Mondal¹,

Bhaumik²,

Baur³

et al. 2012

Chem Sci Trans

View full text Add to dashboard Cite

show abstract

“…16 Meanwhile, enhanced F removal was also reported for La impregnation on various supports such as gelatine, 18 amberlite resins, 19 and chitosan. 20,21 However, the synthesis procedure for La-doped AA (LAA) was not fully optimized. The La impregnation on AA achieved previously was 3.3%, 16,22 which could potentially be increased to improve F adsorption.…”

mentioning

confidence: 99%

Synthesis, characterization and application of lanthanum-impregnated activated alumina for F removal

2013

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Elevated fluoride (F) in groundwater presents an obvious environmental concern. Adsorption using activated alumina (AA) is currently the best available technology for F removal, despite its low efficiency, pH dependence, and aluminium (Al) release. The motivation for our study is to synthesise a new F adsorbent by impregnating commercially available granulated AA with lanthanum oxide (LAA), and to explore its F adsorption mechanism on the molecular scale. Five cycles of lanthanum impregnation on AA followed by calcination at 573 K increased the La content up to 19.1% and the F removal from 18.1% by pristine AA to 92.4% by LAA. The SEM, TEM, XRD, TGA, and EXAFS results demonstrated that the 5-20 nm thin flakes of LaOOH on LAA were in an amorphous form, with 7.6 oxygen atoms around each La. This LaOOH layer was uniformly distributed inside the micropores of the 1-3 mm AA granules.LAA exhibited four fold higher F adsorption capacity than AA in the pH range 3.9 to 9.6, with substantially reduced Al release. The ability to regenerate and reuse LAA makes it an attractive sustainable material. Multiple complementary spectroscopic analyses demonstrated that ligand exchange between F and surface hydroxyl groups is the mechanism for F adsorption on LAA. Our work improves the understanding of F interaction with metal oxides on the molecular scale and presents an alternative solution for elevated F water treatment.

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“…Among various polysaccharides, chitin and chitosan derivatives have been gained wide attention as effective biosorbents due to their low cost and high contents of amine and hydroxyl functional groups which show significant adsorption potential for the removal of various aquatic pollutants [26][27][28][29][30][31]. Dextran is another polysaccharide that possesses a complex glucan structure of nearly 5-10% (1,3) α-linked branched units, on average; along with its major linear backbone composed of (1,6) α-D-glycoside residues derived from bacterial sources having three hydroxyl functional groups per each glucose moiety.…”

Section: Introductionmentioning

confidence: 99%

Dextran-graft-poly(hydroxyethyl methacrylate) gels: a new biosorbent for fluoride removal of water

Ahmari

Mousavi

Amini-Fazl

et al. 2012

Designed Monomers and Polymers

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Synthesis of dextran-graft-poly(hydroxyethyl methacrylate) gels as a new fluoride biosorbent was considered in this work. For this propose, the Taguchi experimental design method was used for optimizing the synthetic conditions of the gels to reach high level of fluoride absorbency. The effects of three main parameters including concentrations of monomer (hydroxyethyl methacrylate), crosslinking agent (ethylene glycol dimethacrylate), and initiator (ammonium persulfate) on the final properties of the prepared gels were investigated. The proposed mechanism for grafting and chemically crosslinking reactions was proved with equilibrium water absorption, Fourier-transformed infrared, scanning electron microscopy, and thermogravimetric analysis. Under the optimized synthetic conditions, the maximum fluoride adsorption capacity in distilled water was found to be 8312 (mg fluoride/kg dried gel). As well, the loading of prepared gels with silver nanoparticles has been considered to achieve antibacterial activity. The silver nanoparticles loaded gels showed strong antibacterial activity against Gram-negative Escherichia coli bacterium. Therefore, these new gels can be considered as a potential candidate to develop an efficient antibacterial fluoride biosorbent for water treatment applications.

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Fluoride removal using lanthanum incorporated chitosan beads

Cited by 130 publications

References 25 publications

Studies on Defluoridation of Water by Tea Ash:An Unconventional Biosorbent

Studies on Defluoridation of Water by Tea Ash:An Unconventional Biosorbent

Synthesis, characterization and application of lanthanum-impregnated activated alumina for F removal

Dextran-graft-poly(hydroxyethyl methacrylate) gels: a new biosorbent for fluoride removal of water

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