title: Fundamental studies of novel zwitterionic hybrid membranes: kinetic model and mechanism insights into strontium removal.
abstract: A series of zwitterionic hybrid membranes were prepared via the ring opening of 1,3-propanesultone with the amine groups in the chains of TMSPEDA and a subsequent sol-gel process. Their kinetic models for strontium removal were investigated using three two-parameter kinetic equations (i.e., Lagergren pseudo-first order, pseudo-second order, and Elovich models). Adsorption mechanism was evaluated using intraparticle diffusion model, diffusion-chemisorption model, and Boyd equation. It was found that the adsorption of strontium ions on these zwitterionic hybrid membranes fitted well with the Lagergren pseudo-second order model. Mechanism insights suggested that diffusion-chemisorption was one of the main adsorption mechanisms. Boyd equation exhibited that film-diffusion mechanism might be the control process during the starting period. These findings are very useful in strontium removal from the stimulated radioactive wastewater.
authors.affiliation: Key Laboratory of Membrane Materials & Processes, Department of Chemical and Materials Engineering, Hefei University, 99 Jinxiu Avenue, Hefei Economic and Technological Development Zone, Hefei 230601, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Membrane Materials & Processes, Department of Chemical and Materials Engineering, Hefei University, 99 Jinxiu Avenue, Hefei Economic and Technological Development Zone, Hefei 230601, China.
authors.forename: Junsheng
authors.identifier: 0000-0002-1712-1058
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Membrane Materials & Processes, Department of Chemical and Materials Engineering, Hefei University, 99 Jinxiu Avenue, Hefei Economic and Technological Development Zone, Hefei 230601, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Li
mesh_terms: D000327:Adsorption; D004058:Diffusion; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008567:Membranes, Artificial; D015233:Models, Statistical; D044367:Phase Transition; D012826:Silicone Elastomers / Q000737:chemistry; D013324:Strontium / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D013816:Thermodynamics; D013876:Thiophenes / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry; D014875:Water Pollutants, Radioactive / Q000302:isolation & purification*
chemical_list: D008567:Membranes, Artificial; D012826:Silicone Elastomers; D013324:Strontium; D013501:Surface-Active Agents; D013876:Thiophenes; D062065:Wastewater; D014875:Water Pollutants, Radioactive; C006194:aminoethyl-aminopropyl-trimethoxysilane; C003218:1,3-propane sultone