Comparative study of uranium and thorium metal ion adsorption by gum ghatti grafted poly(acrylamide) copolymer composites

Abstract

Uranium and thorium ions were selectively removed from aqueous solution using synthesized gum ghatti grafted poly(acrylamide) gum-g-poly(AAm) composite. A gamma radiation induced free radical copolymerization technique was used to synthesize the copolymer composite of gum-g-poly(AAm).Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to characterize the graft copolymer gum-g-poly(AAm). The adsorption of uranium ions and thorium ions using the gum-g-poly(AAm) copolymer composites has been investigated in batch mode. The adsorptive characteristics were investigated by varying the pH, concentration and time for both ions. The adsorption method depends on the pH of each metal ion, and the highest adsorption percentage was achieved at pH 6.0. The adsorption statistics were justified by isotherm, kinetic and thermodynamic models. The Langmuir adsorption model was revealed to be the best fitted monolayer arrangement, with a maximum adsorption capacity of 367.65 mg g À1 for the uranium ions and 125.95 mg g À1 for the thorium ions. The adsorption of metal ions occurred by the ion exchange process, which was specified through the rate controlling step with a best-fitted pseudo-second order kinetic rate model. Thermodynamic analysis shows that the DH and DS values for the uranium ions and thorium ions were positive. The negative DG values decreased with an increase in temperature, suggesting that the metal ion adsorption process was endothermic and spontaneous in behaviour. Fig. 8 Kinetics model (a) pseudo-first order, (b) pseudo-second order, and (c) Weber Morris model. 41332 | RSC Adv., 2019, 9, 41326-41335 This journal is

Biodegradable Gg-cl-poly(NIPAm-co-AA)/-o-MWCNT based hydrogel for combined drug delivery system of metformin and sodium diclofenac: in vitro studies

“…The peaks at 1311.47 cm −1 and 1234.70 cm −1 were caused by stretching vibrations of the C–O–C. 32 The bands due to the CO stretch are very prominently seen in the range 1710.48 cm −1 for the carboxylated MWCNT, which can be assigned to the acid carbonyl-stretching mode. 33 Apart from this, other bands seen in this o -MWCNT are a small one at 2824.03 cm −1 and another at 3331.87 cm −1 , that are characteristic of C–H and O–H, stretches respectively.…”

“…In the above stated models M t /M N is the cumulative fraction of drug release, 't' is the release time, 'n' is the release exponent, M 0 is the amount of drug loaded in hydrogel, M t is amount of drug release at time 't' and k 0 , k 1 , k 2 , k 3 and k 4 are the release rate constants. 31 32 The bands due to the C]O stretch are very prominently seen in the range 1710.48 cm −1 for the carboxylated MWCNT, which can be assigned to the acid carbonyl-stretching mode. 33 Apart from this, other bands seen in this o-MWCNT are a small one at 2824.03 cm −1 and another at 3331.87 cm −1 , that are characteristic of C-H and O-H, stretches respectively.…”

“…It was determined that the pyranose rings of polysaccharides C-O and C-C stretching vibrations were responsible for the absorption peaks between 1033.08 cm −1 and 1421.97 cm −1 . The peaks at 1311.47 cm −1 and 1234.70 cm −1 were caused by stretching vibrations of the C-O-C 32. The bands due to the C]O stretch are very prominently seen in the range 1710.48 cm −1 for the carboxylated MWCNT, which can be assigned to the acid carbonyl-stretching mode 33.…”

Oxidized multiwalled carbon nanotube reinforced rheological examination on Gum ghatti‐cl‐poly(acrylic acid) hydrogels

“…They offer various advantages over traditional adsorbents. The grafted polymer composites of GG with vinyl monomer outperform the grafted composites in mechanical and physical capabilities 31 …”

“…The grafted polymer composites of GG with vinyl monomer outperform the grafted composites in mechanical and physical capabilities. 31 While there have been publications on nanotube/ hydrogel composites, most of the research has concentrated on nanotube/polymer composites generated by surface grafting polymerization of a polymer on the nanotube surface. 32,33 Unlike earlier research, we created the nanotube/ polymer composites by crosslinking polymerization of modified MWNTs with GG and acrylic acid.…”