Fundamental studies of novel zwitterionic hybrid membranes: kinetic model and mechanism insights into strontium removal.

Wen Zhu,Junsheng Liu,Meng Li

doi:10.1155/2014/485820

Wen Zhu, Junsheng Liu + Show 1 more

Open Access

https://doi.org/10.1155/2014/485820

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Journal: TheScientificWorldJournal	Publication Date: Jan 1, 2014
Citations: 35	License type: CC BY 3.0

Affiliation: Hefei University

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.

Highlights

As one of the most promising energy supply approaches for fossil fuels, nuclear power technology has caught escalating interests
Their kinetic models and adsorption mechanism for strontium removal were examined. The novelty of this investigation is that (1) the anionic and cationic groups were grafted on the molecular chains the ring-opening reaction of 1,3-propanesultone (PS) with the amine groups in the chains of TMSPEDA; (2) the application of zwitterionic hybrid membranes was extended to the new field of radionuclide removal, and (3) as typical examples, the kinetic models and adsorption mechanism of strontium ions were investigated for the potential removal of radionuclides from the stimulated radioactive wastewater
We hope that some preliminary adsorption data and typical models can be achieved via the measurement of the single strontium ions

Summary

Introduction

As one of the most promising energy supply approaches for fossil fuels, nuclear power technology has caught escalating interests. To extend the application field of membranes and develop a new type of zwitterionic hybrid membranes for the removal of strontium (Sr2+) ions from the stimulated radioactive wastewater, a series of novel zwitterionic hybrid membranes were prepared via the ring opening of 1,3propanesultone (PS) with the amine groups in the chains of TMSPEDA and a subsequent sol-gel process. Their kinetic models and adsorption mechanism for strontium removal were examined. The novelty of this investigation is that (1) the anionic and cationic groups were grafted on the molecular chains the ring-opening reaction of 1,3-propanesultone (PS) with the amine groups in the chains of TMSPEDA; (2) the application of zwitterionic hybrid membranes was extended to the new field of radionuclide removal, and (3) as typical examples, the kinetic models and adsorption mechanism of strontium ions were investigated for the potential removal of radionuclides from the stimulated radioactive wastewater

Experimental

Results and Discussion

Conclusions