Fluoride removal in waters using ionic liquid-functionalized alumina as a novel adsorbent

Fluoride removal from living entities is the foremost task as it is a non-biodegradable and harmful pollutant mostly found in groundwater. Nowadays, the application of nanoparticles as an adsorbent of fluoride is becoming an intense research due to its high surface area. In the present study, zeolitic imidazolate framework-8 (ZIF-8) nanoparticles adsorption behavior and its efficiency in fluoride removal from an aqueous phase were studied. Various structures, sizes and morphologies of nanoparticles were investigated by Fourier-transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, Raman spectroscopy and zeta seizer. By varying process parameters such as contact time, adsorbent dosage, stirring rate, temperature, and pH, batch adsorption was carried out. The optimum conditions for fluoride removal by ZIF-8 nanoparticles were found as contact time 15 min, adsorbent dosage 0.06 g/L, agitation rate 400 rpm, temperature 20 °C, pH 8. Pseudo-second order in kinetic study showcases that the regression coefficient was found to be 0.99. The experimental data of Langmuir isotherm model of adsorption system reveal the adsorption capacity of 90 mg/g which has better adsorption capacity than other adsorbents. The isothermal multistage adsorption was also studied to understand the mechanism of adsorption of ZIF-8 nanoparticles for fluoride removal. The result in the present work gives a promising adsorbent for the fluoride removal.

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“…The fluoride removal efficiency of 92% was achieved in 0.06 g/L dose of ZIF-8. The same trend line was described by (Ekka et al 2017).…”

Section: Influence Of Adsorbent Dosesupporting

confidence: 68%

Zeolitic imidazolate framework-8 nanoparticle: a promising adsorbent for effective fluoride removal from aqueous solution

et al. 2019

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“…As is well known, the adsorption free energy is the embodiment of the driving force. It can be seen from Table 9 that ΔG was less than zero at 25 °C, 35 °C and 45 °C, revealing that the adsorption reaction was spontaneous [37,38]. Meanwhile, ΔG gradually reduced with increasing temperature, which meant that the higher temperature was conducive to the progress of the adsorption reaction.…”

Section: Eer Reviewmentioning

confidence: 94%

Fabrication of Manganese-Supported Activated Alumina Adsorbent for Defluoridation of Water: A Kinetics and Thermodynamics Study

You

et al. 2021

Water

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Fluoride pollution frequently occurs in many underground drinking water sources due to discrepancies in the geological environment. To address this problem, a manganese-supported activated alumina (MnOOH-supported AA) adsorbent was proposed in the present study. The adsorbent was prepared with an impregnation method, then the morphology and microstructure were systematically characterized. Further, the adsorption kinetics and thermodynamics were systematically explored through static experiments to confirm the adsorption mechanism. The results showed that MnOOH was successfully loaded on the activated alumina (AA), and irregular and convex spinous structures were formed on the surface of particles. Compared with the AA, MnOOH-supported AA exhibited a significantly higher defluoridation rate, which has been doubled. The kinetic behavior of fluoride adsorption on MnOOH-supported AA was governed by the quasi-second-order kinetics model with regression coefficients of 0.9862, 0.9978 and 0.9956, respectively. The adsorption rate was mainly ascribed to the intra-particle diffusion. Additionally, the Freundlich isotherm equation fitted the adsorption thermodynamic process reasonably well compared with the Langmuir adsorption model. Specifically, the correlation coefficients were 0.9614, 0.9383 and 0.9852 at 25 °C, 35 °C and 45 °C, respectively. The adsorption–desorption isotherm plot was similar to the Type V isotherm. The whole fluoride adsorption was a spontaneous endothermic reaction, and controlled by chemical adsorption. These results demonstrated that MnOOH-supported AA as an alternative to the conventional AA showed promising potential for defluoridation in drinking water treatment.

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“…Thermodynamic parameters indicated the spontaneous process of fluoride sorption for the magnetic nano-composite and the Langmuir isotherm was better suited for the adsorption process, which showed that the adsorption was mainly monolayer. Ekka et al 150 stated that the magnet nano-composite could be regenerated and used efficiently for several cycles due to high efficiency. An environmentally-friendly bio-sorbent, namely Fe 3 O 4 @n-HApCS composite developed through a reliable deposition of magnetic Fe 3 O 4 particles on the nanohydroxyapatite (n-HAp)/chitosan (CS) surface was tested.…”

Section: Magnetic Chitosan Adsorbents For Fluoridesmentioning

confidence: 99%

Preparation and application of magnetic chitosan in environmental remediation and other fields: A review

Shaumbwa

Liu

Archer

et al. 2021

J of Applied Polymer Sci

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Magnetic chitosan has received considerable attention over the decades due to its low cost, biodegradability, green sources, magnetic intensity. In this review, we reviewed the preparation methods of magnetic chitosan using co-precipitation, cross-linking and electrochemical. Therein cross-linking methodologies involved in the reaction of amino groups are facile to introduce additional reaction groups and improve anti-swelling of chitosan layers, mostly in an acidic environment. Besides, we focused on the applications of magnetic chitosan in various fields such as wastewater treatment, for example, removal of heavy metal ions, organic/inorganic dyes, fluorides, and pesticides. Moreover, magnetic chitosan also reveals great potential application in the field of medical, pharmaceutical, food and electronic screening. Above all, magnetic chitosan is economically and operationally beneficial as it can be easily separated and controlled with an external magnetic field and can be modified to maximize its functions.

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Fluoride removal in waters using ionic liquid-functionalized alumina as a novel adsorbent

Cited by 71 publications

References 54 publications

Zeolitic imidazolate framework-8 nanoparticle: a promising adsorbent for effective fluoride removal from aqueous solution

Zeolitic imidazolate framework-8 nanoparticle: a promising adsorbent for effective fluoride removal from aqueous solution

Fabrication of Manganese-Supported Activated Alumina Adsorbent for Defluoridation of Water: A Kinetics and Thermodynamics Study

Preparation and application of magnetic chitosan in environmental remediation and other fields: A review

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