Metal organic framework doped amine-functionalized polymeric beads for selective removal of Uranium (VI) from alkaline leach liquor: Batch and column study

Das, Abhijit; Roy, Debashis; Pandu, Jadav; De, Sirshendu

doi:10.1016/j.seppur.2023.125379

Cited by 7 publications

(4 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the reusability experiments, the initial U concentration was maintained at 125 mg/L, and the optimum dose of adsorbent 1 g/L was employed to explore its capacity toward U removal, after multiple consecutive cycles. As the U concentration (125 mg/L) was significant and in a similar range that is found in typical U-containing effluent, the adsorbent was supposed to be saturated once adsorption–desorption equilibrium was established. Moreover, the reusability study was conducted to identify the variation of the adsorptive capacity of the adsorbent upon multiple cycles and its practical applicability in real-life processes, along with its structural and functional integrity.…”

Section: Resultsmentioning

confidence: 91%

“…In the early phase of adsorption, U removal increases with the adsorbent dose. The aggregation of the particles at higher doses promotes overcrowding of the adsorption active sites, limiting the effective surface area, and restriction of U diffusion inside the pores . As a result, there was no further increase in adsorption beyond the dose of 1 g/L, resulting in a decrease in removal efficiency of U (99.4 to 95%).…”

Section: Resultsmentioning

confidence: 99%

“…As the U concentration (125 mg/L) was significant and in a similar range that is found in typical U-containing effluent, 62 the adsorbent was supposed to be saturated once adsorption− desorption equilibrium was established. Moreover, the reusability study was conducted to identify the variation of the adsorptive capacity of the adsorbent upon multiple cycles and its practical applicability in real-life processes, along with its structural and functional integrity.…”

Section: Desorption and Reusability Studymentioning

confidence: 88%

“…The aggregation of the particles at higher doses promotes overcrowding of the adsorption active sites, limiting the effective surface area, and restriction of U diffusion inside the pores. 62 As a result, there was no further increase in adsorption beyond the dose of 1 g/L, resulting in a decrease in removal efficiency of U (99.4 to 95%). Therefore, it was decided that 1 g/L was the optimum dose for further adsorption studies.…”

Section: Effects Of Dose Of Hcpa Solution Ph and Ph Pzcmentioning

confidence: 97%

See 3 more Smart Citations

Efficient Adsorption and Desorption of Uranium(VI) Using a Polymeric Adsorbent: A Combined Theoretical and Experimental Approach with Real-Life Alkaline Leach Liquor

Das,

Jana,

Das

et al. 2024

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Alkaline leaching is used for the extraction of uranium from rarely available carbonate ore. A hyperbranched cross-linked polymeric adsorbent (HCPA) was developed for selective recovery of uranium(VI) (U) from real-life alkaline leach liquor. HCPA was synthesized using the free radical copolymerization of acrylamide and N, N-methylene bis(acrylamide). In addition, potassium persulfate (as the initiator) and dodecanethiol (as the brancher) were used to transfer the radicals for faster chain formation and smooth branching of the long-chain polymer. Several methods were used extensively to characterize the adsorbent. The Langmuir maximum U adsorption capacity of HCPA was 1012 mg/g at 303 K, and 98% of U was removed from alkaline leach liquor. U was adsorbed at pH 8.5 in the presence of various interfering co-ions and desorbed at pH 11.5 in the form of sodium diuranate (Na 2 U 2 O 7 ) precipitate. The adsorption was monolayer, exothermic, and spontaneous in nature. The C−N, CO− NH 2 , and C−OH groups of HCPA interacted with uranyl ions initiating the coordinative and electrostatic interactions leading to U adsorption. Continuous fixed-bed column runs were performed using the actual leach liquor, and a fundamental kinetic model was used to quantify the performance of columns. The transport parameters were estimated from the model, and scaling-up calculations were performed using these parameters. Five adsorption−desorption cycles were conducted to determine the reusability and structural stability of the synthesized polymeric adsorbent.

show abstract

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Desorption and Reusability Studymentioning

confidence: 88%

Section: Effects Of Dose Of Hcpa Solution Ph and Ph Pzcmentioning

confidence: 97%

See 2 more Smart Citations