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- W2055251946 abstract "Hydrous Ce(IV)–Zr(IV) oxide (Ce/Zr ∼ 1:1, mol/mol) (HCZMO) prepared by simple chemical precipitation was nanoparticles (60–70 nm) agglomerate with irregular surface morphology. The BET surface area, pore volume and pHzpc were estimated to be 185.04 m2 g−1, 0.1219 cm3 g−1 and 5.8 (±0.2), respectively. Investigation of fluoride adsorption over HCZMO from its aqueous phase at an optimized pH ∼ 6.0 showed that the adsorption kinetics and equilibrium data described, respectively, the pseudo-second order equation (R2 = 0.98–0.99) and the Langmuir isotherm (R2 > 0.99) very well. Values of the computed Arrhenius activation energy, Ea (1.16 kJ mol−1), Langmuir monolayer capacity, θ (19.5 mg g−1), D–R adsorption energy, ED–R (15.05 kJ mol−1) and isosteric heat of reaction, ΔHr (0.518 kJ mol−1) suggested that the fluoride has high affinity for homogeneous HCZMO surface for adsorption. Evidences appeared from the equal distribution co-efficient values and too well Langmuir isotherm fit. The fluoride adsorption reactions at 298–313 K with HCZMO were spontaneous (ΔG0 = negative) despite endothermic nature (ΔH0, kJ mol−1 = +3.53, +4.04), owing to the increase of entropy (ΔS0, J mol−1 K−1 = +12.4, 13.8). More than 95% fluoride was released from F−HCZMO (24.8 mg F− g−1) by 1.0 M NaOH, confirming the ion-exchange adsorption mechanism inclining to chemisorption. 1 g HCZMO per liter of a groundwater (F−: 4.40 mg L−1) can reduce fluoride level below 1.5 mg L−1 in batch treatment." @default.
- W2055251946 created "2016-06-24" @default.
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- W2055251946 date "2014-07-01" @default.
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- W2055251946 title "Agglomerated nanoparticles of hydrous Ce(IV)+Zr(IV) mixed oxide: Preparation, characterization and physicochemical aspects on fluoride adsorption" @default.
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- W2055251946 doi "https://doi.org/10.1016/j.apsusc.2014.04.095" @default.
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