Phosphorus-modified poly(styrene-co-divinylbenzene)–PAMAM chelating resin for the adsorption of uranium(VI) in aqueous

• Published in: Journal of hazardous materials 2013-12, Vol.263, p.311-321
• Main Authors: Cao, Qiong, Liu, Yaochi, Wang, Chunzhi, Cheng, Jiashun
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Chelating Agents - chemistry; Chelating resins; Dendrimers - chemistry; Desorption; Hydrogen-Ion Concentration; Ions; Isotherms; Kinetics; Mathematical models; Metals - chemistry; Phosphorus; Phosphorus - chemistry; Polyamidoamine-typed hyperbranched polymer; Polyamines - chemistry; Polymers - chemistry; Polystyrene resins; Polystyrenes - chemistry; Solvents - chemistry; Spectroscopy, Fourier Transform Infrared; Synthesis; Temperature; Thermodynamics; Uranium; Uranium - analysis; Uranium - chemistry; Water Pollutants, Chemical - analysis; Water Purification - methods
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2013.05.039

•A series of phosphorus-modified poly(styrene-co-divinylbenzene)–PAMAM chelating resins were synthesized.•The materials were commercially available and economic.•The new resins were high effective and selective adsorbents.•U(VI) adsorption is fitted with pseudo-second-order equation and Langmuir model.•The new resins can be regenerated. Polyamidoamine (PAMAM) modified poly(styrene-co-divinylbenzene) absorbents carrying phosphorus functional groups (PS-PAMAM-PPA) were prepared and used as adsorbents for the adsorption of uranium(VI) from aqueous solution. Different generations of PAMAM were used for obtaining different chelating resins, PS-PPA, PS-1.0G PAMAM-PPA, PS-2.0G PAMAM-PPA, PS-3.0G PAMAM-PPA and PS-4.0G PAMAM-PPA. The synthesized resins were characterized by FTIR and XPS. The effects of many physio-chemical properties on metal ion adsorption to adsorbent phase, such as solution pH, kinetic studies, initial uranium concentration, temperature, were investigated using batch method. The results showed that the maximum adsorption capacity (99.89mg/g) was observed at the pH 5.0 and 25°C with initial U(VI) concentration 100mg/L and adsorbent dose 1g/L. PS-1.0G PAMAM-PPA had the largest adsorption capacity for U(VI) compared with other prepared adsorbents. The adsorption kinetics of U(VI) onto PS-1.0G PAMAM-PPA followed the mechanism of the pseudo-second-order equation, indicating that the chemical adsorption was a rate-limiting step. The calculated thermodynamic parameters (ΔG, ΔH, ΔS) stated that the adsorption of U(VI) onto PS-1.0G PAMAM-PPA were spontaneous, endothermic and feasible. The adsorption isotherms obeyed the Langmuir isotherm models. The desorption studies showed that PS-1.0G PAMAM-PPA could be used repeatedly and adsorption and desorption percentage did not have any noticeable loss after 27 cycles in a fixed bed.