Cationic dye adsorption by phosphomolybdate nanoclusters immobilised on polyelectrolyte matrix

Shakeela, K.; Guru, Sruthi; Rao, G. Ranga

doi:10.1007/s12039-020-01804-2

Cited by 7 publications

(3 citation statements)

References 60 publications

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“…Appearing usually around 932 cm − 1 [43], or 962-963 cm − 1 [44,45] in phosphomolybdate-based compounds and composites, in the present case M--O stretching is observed at ~901 cm − 1 after molybdate sorption onto P-APEI.…”

Section: Ftir Spectroscopymentioning

confidence: 50%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3-4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g − 1 and 2.09 mmol Mo(VI) g − 1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30-40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5-3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).

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Section: Ftir Spectroscopymentioning

confidence: 50%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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“…Unlike PWA, the hybrids did not show any sharp peaks at higher angle region, while a set of new intense peaks are seen below 2θ = 10°. This indicates that the hybrids are amorphous and have short range order [54,38]. The materials have d-spacing of almost 1.5 nm and the particle size of these materials range from 10-30 nm as calculated by Scherrer equation.…”

Section: Physicochemical Characterizationmentioning

confidence: 98%

“…The phosphorous present in unsubstituted Keggin, (PW 12 O 40 ) 3-, shows a peak at -15 ppm in31 P NMR[55]. The vacancy present in the monolacunary Keggin, (PW 11 O 39 ) 7-, deshields the phosphorous to a chemical shift of -10 ppm[56,54]. The presence of metal substitution in the lacunary site of Keggin in hybrid materials, partially shielded the phosphorous to around − 13.7 ppm[57], as shown in Fig.8.…”

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confidence: 99%

Sustainable Production of Cyclic Carbonates from CO 2 and Epoxides Using Transition Metal Substituted Polyoxometalate-TBA Hybrid Catalysts

Jan,

Ghosh,

Shakeela

et al. 2023

Preprint

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Transition metal substituted polyoxometalates (TMS-POMs) are well recognized for their catalytic characteristics due to their fascinating chemical and physical properties resulting from unparalleled adaptability and structural variety. The interaction of these TMS-POMs with the bulky organic cations enhances the catalytic efficiency with the change in morphology. In this work, we used three hybrid materials of transition metal (Co2+, Ni2+, Cu2+) substituted lacunary Keggin polyoxometalate with tetrabutylammonium cations. The formation and structural features of hybrid materials have been studied by powder XRD, TGA, SEM, TEM, FTIR, and 31P NMR. These hybrid catalysts have been used for the atom-economic coupling of carbon dioxide (CO2) with epoxides to produce cyclic carbonates at incredibly mild circumstances, such as room temperature and atmospheric pressure. The method described here allows for the rapid and effective quantitative conversion of several aliphatic, cyclic, and aromatic epoxides to their respective cyclic carbonates in solvent-free conditions. The cobalt substituted hybrid catalyst shows the highest activity and selectivity with a minimum quantity of 0.12 mol% adequate to provide 85% conversion in 3 h at room temperature. The catalyst is recovered and reused up to four cycles without a drastic loss in activity, hence providing long-term solutions for climate change and environmental concerns.

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Green Synthesis of Cyclic Carbonates from Epoxides and CO2 Using Transition Metal Substituted Polyoxometalate-PDDA Hybrid Catalysts

Jan,

Biji,

Shakeela

et al. 2023

Catal Lett

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Cationic dye adsorption by phosphomolybdate nanoclusters immobilised on polyelectrolyte matrix

Cited by 7 publications

References 60 publications

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Sustainable Production of Cyclic Carbonates from CO 2 and Epoxides Using Transition Metal Substituted Polyoxometalate-TBA Hybrid Catalysts

Green Synthesis of Cyclic Carbonates from Epoxides and CO2 Using Transition Metal Substituted Polyoxometalate-PDDA Hybrid Catalysts

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