Defluoridation of Water Using Zirconium Impregnated Coconut Fiber Carbon

Sathish, R. Sai; Sairam, Sai Giridhar; Raja, Vaseem; Rao, G. Nageswara; Janardhana, Ch.

doi:10.1080/01496390802222541

Cited by 60 publications

(17 citation statements)

References 27 publications

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“…Results clearly revealed that AICFA showed little higher surface area than unimpregnated coconut fiber. This is perhaps due to the uniform coating of alum on the surface of the coconut fiber, and hence the increase in the pore volume [33]. However, exactly opposite result can be expected.…”

Section: Characterization Of Aicfamentioning

confidence: 83%

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

Mondal

Bhaumik

Datta

2015

Alexandria Engineering Journal

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Aluminum impregnated coconut fiber ash (AICFA) was used for removal of fluoride from synthetic fluoride solution. The AICFA showed high specific area and strong affinity toward fluoride. Synthesized AICFA was characterized by pH ZPC , FTIR, SEM and XRD studies. Adsorption kinetics indicated that the adsorption equilibrium was reached within 60 min and the adsorption process followed the pseudo-second-order kinetic model better. The Langmuir isotherm model could fit the experimental data well. Thermodynamic parameters such as Gibbs free energy (DG ), enthalpy (DH ) and entropy (DS ) change of sorption were also evaluated which indicated that the adsorption process was spontaneous, feasible and exothermic in nature. Furthermore, the coexisting anions had significant effect on fluoride adsorption. Moreover, desorption study with AICFA showed that nearly 98% of fluoride could be leached out at pH 12. Further, the reusable properties of the material supported the possibility of its use commercially. Ó 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Characterization Of Aicfamentioning

confidence: 83%

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

Mondal

Bhaumik

Datta

2015

Alexandria Engineering Journal

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“…The maximum adsorption capacity for ZrOx-AC was 3 times higher than Zr-impregnated coconut shell carbon (1.75 mg g −1 ), iron-impregnated granular ceramic (2 mg g −1 ), Ca-impregnated nutshell carbons (2.3 mg g −1 ) and aligned carbon nanotubes [30–33]. …”

Section: Resultsmentioning

confidence: 99%

Zirconium–Carbon Hybrid Sorbent for Removal of Fluoride from Water: Oxalic Acid Mediated Zr(IV) Assembly and Adsorption Mechanism

Velázquez-Jiménez

Hurt

Matos

et al. 2013

Environ. Sci. Technol.

192

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When activated carbon (AC) is modified with zirconium(IV) by impregnation or precipitation, the fluoride adsorption capacity is typically improved. There is significant potential to improve these hybrid sorbent by controlling the impregnation conditions, which determine the assembly and dispersion of the Zr phases on carbon surfaces. Here, commercial activated carbon was modified with Zr(IV) together with oxalic acid (OA) used to maximize the zirconium dispersion and enhance fluoride adsorption. Adsorption experiments were carried out at pH 7 and 25 °C with a fluoride concentration of 40 mg L−1. The OA/Zr ratio was varied to determine the optimal conditions for subsequent fluoride adsorption. The data was analyzed using the Langmuir and Freundlich isotherm models. FTIR, XPS and the surface charge distribution were performed to elucidate the adsorption mechanism. Potentiometric titrations showed that the modified activated carbon (ZrOx-AC) possesses positive charge at pH lower than 7, and FTIR analysis demonstrated that zirconium ions interact mainly with carboxylic groups on the activated carbon surfaces. Moreover, XPS analysis demonstrated that Zr(IV) interacts with oxalate ions, and the fluoride adsorption mechanism is likely to involve –OH− exchange from zirconyl oxalate complexes.

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“…However, the practical utility of these materials is limited due to some drawbacks such as selectivity, reuse potential, requirement of extreme pH (acidic or basic) and physical and chemical stability which require improvement . Metal‐based adsorbents with specific metal ions incorporated (coated/ loaded/ entrapped/ impregnated) in various solid structures have also been explored for improved and preferable fluoride removal . Although these modified adsorbents have reported efficient fluoride adsorption and good chemical stability, it has been observed that during sorption, the metal ion leaches out from the solid structures resulting in further contamination of treated water ,.…”

Section: Introductionmentioning

confidence: 99%

Organometallic Adsorbent for Mitigating Fluoride from Water: An Environment‐Friendly Approach

2018

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Fluoride-related health hazards are a serious environmental problem across the globe. Unavailability of an effective therapeutic agent to cure fluorosis creates an exigency to adopt preventive measures to curb excess fluoride intake. Herein, we report a zirconium-based organometallic adsorbent (ZrVAc) for mitigating fluoride from water. The crosslinked, three dimensional and porous architecture of ZrVAc, composed of zirconyl methacrylate (ZrDMA) and vinyl acetate (VAc) have high porosity and excellent mechanical stability. The experimental factors such as effects of solution pH, coexisting anions, temperature, pH pzc , isotherm models and surface chemistry were investigated to verify the adsorption properties of ZrVAc.The equilibrium data were fitted well with Freundlich and Langmuir adsorption isotherms. The highest fluoride adsorption capacity (q m ) was found to be 138 mg/g (at pH 7.0 � 0.2, initial F À concentration 100 mg/L, adsorbent dose 0.5 g/L for 6 h). The thermodynamic constants ΔG, ΔH, and ΔS were calculated as 45.158 KJ mol À 1 (at 303 K), À 37.64 KJ mol À 1 , and À 0.161 KJ mol À 1 . ZrVAc showed efficient adsorption in pH range of pH 6.0-8.0 which is preferable for field water application. Toxicity characteristics leaching procedure (TCLP) results suggested the ZrVAc was inert; does not leach out any contaminants (Zr, F À ) and delivers safe and potable treated water.

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Defluoridation of Water Using Zirconium Impregnated Coconut Fiber Carbon

Cited by 60 publications

References 27 publications

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

Zirconium–Carbon Hybrid Sorbent for Removal of Fluoride from Water: Oxalic Acid Mediated Zr(IV) Assembly and Adsorption Mechanism

Organometallic Adsorbent for Mitigating Fluoride from Water: An Environment‐Friendly Approach

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