Chitosan-Fe-Al-Mn metal oxyhydroxides composite as highly efficient fluoride scavenger for aqueous medium

Chaudhary, Mohit; Rawat, Shweta; Jain, Neha; Bhatnagar, Amit; Maiti, Abhijit

doi:10.1016/j.carbpol.2019.04.028

Cited by 58 publications

(12 citation statements)

References 48 publications

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“…It is also worth noting that, in Figure 2 b, the peaks of lower intensity observed in VPum at 35.30°, 42.34°, and 42.34° were almost undetectable in the XRD technique after the modification. This could be due to the growth of zirconium oxide over the surface [ 26 ]. Furthermore, some small peaks were detected after fluoride adsorption ( Figure 2 c).…”

Section: Resultsmentioning

confidence: 99%

“…The coagulation sedimentation methods [ 21 , 22 , 23 , 24 ] are simple to use, low cost and simple to apply; nevertheless, the dosage is too high and cannot be regenerated, causing secondary pollution and difficulty reducing fluoride to permissible levels. Adsorption using low-cost and locally available materials has been considered a highly efficient and well-accepted fluoride removal process by researchers of recent decades [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Adsorbent materials investigated for fluoride removal are numerous [ 26 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. However, many of the materials suffer from either time-consuming synthesis procedures, high manufacturing costs, scarcity of raw materials, or a short lifetime, making them impractical to apply in remote regions of Africa.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Defluoridation of Water Using Zirconium—Coated Pumice in Fixed-Bed Adsorption Columns

2021

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Millions of people across the globe suffer from health issues related to high fluoride levels in drinking water. The purpose of this study was to test modified pumice as an adsorbent for the purification of fluoride-containing waters. The adsorption of fluoride onto zirconium-coated pumice (Zr–Pu) adsorbent was examined in fixed-bed adsorption columns. The coating of zirconium on the surface of VPum was revealed by X-ray diffractometer (XRD), Inductively coupled plasma-optical emission spectroscopy (ICP-EOS), and X-ray fluorescence (XRF) techniques. The degree of surface modification with the enhanced porosity of Zr–Pu was evident from the recorded scanning electron microscope (SEM) micrographs. The Brunauer-Emmett-Teller (BET) analysis confirmed the enhancement of the specific surface area of VPum after modification. The Fourier transform infrared (FTIR) examinations of VPum and Zr–Pu before and after adsorption did not reveal any significant spectrum changes. The pH drift method showed that VPum and Zr–Pu have positive charges at pHPZC lower than 7.3 and 6.5, respectively. Zr–Pu yielded a higher adsorption capacity of 225 mg/kg (2.05 times the adsorption capacity of VPum: 110 mg/kg), at pH = 2 and volumetric flow rate (QO) of 1.25 mL/min. Breakthrough time increases with decreasing pH and flow rate. The experimental adsorption data was well-matched by the Thomas and Adams-Bohart models with correlation coefficients (R2) of ≥ 0.980 (Zr–Pu) and ≥ 0.897 (VPum), confirming that both models are suitable tools to design fixed-bed column systems using volcanic rock materials. Overall, coating pumice with zirconium improved the defluoridation capacity of pumice; hence, a Zr–Pu-packed fixed-bed can be applied for defluoridation of excess fluoride from groundwater. However, additional investigations on, for instance, the influences of competing ions are advisable to draw explicit conclusions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Defluoridation of Water Using Zirconium—Coated Pumice in Fixed-Bed Adsorption Columns

2021

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“…Because biomass material is eco-friendly, biocompatible, low cost, and renewable, adsorption of uorides utilizing different PPy-based bio adsorbents is a highly promising technique. Biomass materials, such as charcoal, 54 pomelo peel, 55 and chitosan, 56 are widely recognized as effective adsorbents for uoride removal. Polypyrrole/chitosan, polypyrrole-graed peanut shell biological carbon, and polypyrrole-modied pomelo peel biochar are currently being developed.…”

Section: Polypyrrole Bio-adsorbentsmentioning

confidence: 99%

Application of polypyrrole-based adsorbents in the removal of fluoride: a review

Wang

Alhassan

et al. 2022

RSC Adv.

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“…Yadav et al discussed a synthesizing route of cellulose/iron oxide nanocomposite [29] which enhanced the properties significantly. Chitosan-Fe-Al-Mn oxyhydroxide composites have been developed by Chaudhary et al targeting adsorption applications [30]. To the best of our knowledge, there is no attempt that has been taken to incorporate iron oxide-based nanofillers into the chitosan structure targeting active packaging applications.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly, Green Packaging Materials from Akaganeite and Hematite Nanoparticle-Reinforced Chitosan Nanocomposite Films

Chandrakumara

Dissanayake

Mantilaka

et al. 2019

Journal of Nanomaterials

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In this study, chitosan nanocomposite thin films were successfully fabricated by incorporating hematite nanoparticles (HNPs) and akaganeite nanoparticles (ANPs) as reinforcing fillers using the solution casting method. HNPs and ANPs were synthesized via a urea-assisted synthesis route using naturally occurring ferruginous laterites. Scanning electron microscopic (SEM) images indicated the spherical to subhexagonal morphology of the HNPs and rice-like morphology of the ANPs. X-ray diffractograms indicate the crystalline structure of iron oxides as hematite and akaganeite. Tensile tests were carried out to evaluate the mechanical properties of the nanocomposite films where maximum tensile stress of the chitosan/HNP composites was improved as high as 35.7% while chitosan/ANP composites indicated 43.5%. Thermal decomposition curves obtained by thermogravimetric analysis (TGA) indicate that the thermal stability of the nanocomposites has improved remarkably compared to neat chitosan films. Furthermore, these nanocomposites exhibited excellent UV barrier properties as identified by UV-visible spectrometry. Fourier-transform infrared (FTIR) spectroscopic results are evident in the presence of Fe-O bond in the wavenumber around 480-500 cm -1 , and the result also indicated that the nanofillers interact with the chitosan matrix via hydrogen bonding, which enhanced the physical properties of the nanocomposites. Incorporation of iron oxide nanoparticle varieties into chitosan has led to improvements of certain physical and chemical properties, which make chitosan a promising material for packaging applications.

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Chitosan-Fe-Al-Mn metal oxyhydroxides composite as highly efficient fluoride scavenger for aqueous medium

Cited by 58 publications

References 48 publications

Enhanced Defluoridation of Water Using Zirconium—Coated Pumice in Fixed-Bed Adsorption Columns

Enhanced Defluoridation of Water Using Zirconium—Coated Pumice in Fixed-Bed Adsorption Columns

Application of polypyrrole-based adsorbents in the removal of fluoride: a review

Eco-Friendly, Green Packaging Materials from Akaganeite and Hematite Nanoparticle-Reinforced Chitosan Nanocomposite Films

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