Adsorptive Removal of Trace Concentration of Fluoride Using Orange Waste Treated Using Concentrated Sulfuric Acid

Paudyal, Hari

doi:10.11648/j.ijmsa.20170604.18

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…To avoid the dissolution of the adsorbent in aqueous solutions, polyphenol and polysaccharide hydroxyl groups in the biomass were cross-linked through condensation reaction using concentrated sulfuric acid as a dehydrating agent. The cross-linked pomegranate peels were prepared as described in Paudyal et al, [78]. 15 g of this biomass powder was mixed with 30 mL of concentrated H 2 SO 4 (96%) in a round bottom flask and the mixture was agitated for 24 h at 100 • C followed by cooling at room temperature.…”

Section: Synthesis Of Tio 2 Impregnated Pomegranate Peels (Pp@tio 2 )mentioning

confidence: 99%

Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water

et al. 2020

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A novel type of adsorbent, TiO2 impregnated pomegranate peels (PP@TiO2) was successfully synthesized and its efficacy was investigated based on the removal of As(III) from water. The adsorbent was characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectrometer (EDS), X-ray Diffraction (XRD) analysis, and Fourier Transform Infrared (FTIR) Spectroscopy, to evaluate its morphology, elemental analysis, crystallinity, and functional groups, respectively. Batch experiments were conducted on PP@TiO2 for As(III) adsorption to assess the adsorption isotherm, effect of pH, and adsorption kinetics. Characterization data suggested that TiO2 was successfully impregnated on the biomass substrate. The equilibrium data better fitted to the Langmuir isotherm model having a maximum adsorption capacity of 76.92 mg/g and better distribution coefficients (KD) in the order of ~103 mL/g. The highest percentage of adsorption was found at neutral pH. The adsorption kinetics followed the pseudo-2nd-order model. X-ray Photoelectron Spectroscopy (XPS) of the adsorption product exhibited that arsenic was present as As(III) and partially oxidized to As(V). PP@TiO2 can work effectively in the presence of coexisting anions and could be regenerated and reused. Overall, these findings suggested that the as-prepared PP@TiO2 could provide a better and efficient alternative for the synergistic removal of As(III) from water.

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Section: Synthesis Of Tio 2 Impregnated Pomegranate Peels (Pp@tio 2 )mentioning

confidence: 99%

Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water

et al. 2020

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“…In addition, the peaks in biochar at 1,605 and 1,437 cm -1 , had an intensification and shift in Al-Ca-Zn-tab, staying at 1,634 and 1,426 cm -1 as a function of the exchange of low atomic molecular weight ions to high atomic weight ions. Thus, the carboxylic acid functional group Al-Ca-Zn-tab is the primary functional group participating during the metal impregnation reaction (Paudyal et al, 2017).…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…Thus, as expounded by (Paudyal et al, 2013), the application of agricultural residues is an excellent alternative due to their low cost and the presence of a variety of functional groups for modification. These metal ions have high resistance to acid or alkali attack and form stable fluoride complexes, resulting in a very high selectivity towards fluoride ions (Paudyal et al, 2017).…”

Section: Synthesis Of the Al-ca-zn-tab Adsorbentmentioning

confidence: 99%

Al-Ca-Zn Trimetallic Compound Supported on Tobacco Residue: A Sustainable Alternative for the Removal of Fluoride Ions from Water Supply

Somavilla

Paula

Jahn

et al. 2023

Preprint

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The presence of fluoride ions in groundwater used for public supply may expose a large portion of the world population to the deterioration of teeth and bones, among other health issues. Within this context, the agricultural activities related to tobacco imply the use of large amounts of phosphate fertilizers, endowed with large residual amounts of fluoride. Thus, fertilizers application combined with rain and irrigation of tobacco crops contributes to high fluoride levels in groundwater. In this study, a residue from the tobacco production chain, the tobacco stem, was used as a support medium for the synthesis of an Al-Ca-Zn trimetallic compound, being named Al-Ca-Zn-tab. Thereby, an alternative adsorbent based on the recycling of an agricultural residue is presented. The impregnation and pyrolysis at 500°C of the material were the main steps adopted in the synthesis of Al-Ca-Zn-tab. The Response Surface analysis showed a positive and increasing effect of the adsorbent concentration. The pH, however, did not affect the adsorption. The efficiencies of fluoride removal were up to 71.7%, with actual accumulations up to 2.78 mg g-1, and maximum accumulations of 13.59 mg g-1. The fluoride adsorption on Al-Ca-Zn-tab followed the Freundlich isotherm and the general order kinetic model. In addition, the thermodynamic data suggested the predominance of physisorption phenomena with exothermic characteristics. Finally, the proposed adsorption mechanism is based on ion exchange of the surface hydroxyl groupings of the oxides and hydroxides, in addition to hydrostatic interactions due to the bi and trivalent cations.

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A fluorescence test paper fabricated by in situ growth of zirconium based MOFs for effective detection of fluoride

Zhu

Song

et al. 2023

Inorganic Chemistry Communications

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Adsorptive Removal of Trace Concentration of Fluoride Using Orange Waste Treated Using Concentrated Sulfuric Acid

Cited by 5 publications

References 21 publications

Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water

Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water

Al-Ca-Zn Trimetallic Compound Supported on Tobacco Residue: A Sustainable Alternative for the Removal of Fluoride Ions from Water Supply

A fluorescence test paper fabricated by in situ growth of zirconium based MOFs for effective detection of fluoride

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