Enhanced kinetics and super selectivity toward Cs+ in multicomponent aqueous solutions: A robust Prussian blue analogue/polyvinyl chloride composite membrane

Shangqing Chen; Jiayin Hu; Yafei Guo; Nelson Belzile; Tianlong Deng

doi:10.1016/j.envres.2020.109952

Enhanced kinetics and super selectivity toward Cs⁺ in multicomponent aqueous solutions: A robust Prussian blue analogue/polyvinyl chloride composite membrane

Environ Res. 2020 Oct:189:109952. doi: 10.1016/j.envres.2020.109952. Epub 2020 Jul 19.

Authors

Shangqing Chen¹, Jiayin Hu², Yafei Guo¹, Nelson Belzile³, Tianlong Deng⁴

Affiliations

¹ Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin, 300457, PR China.
² Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin, 300457, PR China. Electronic address: hujiayin@tust.edu.cn.
³ Department of Chemistry & Biochemistry, Laurentian University, Sudbury, ON, P3E2C6, Canada.
⁴ Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin, 300457, PR China. Electronic address: tldeng@tust.edu.cn.

PMID: 32980023
DOI: 10.1016/j.envres.2020.109952

Abstract

Developing effective adsorbents for ¹³⁷Cs removal from complex wastewater systems has been a significant challenge. Although existing spheres adsorbents could improve the post-separation ability and practical operability, the adsorption kinetics are still significantly retarded due to the large intra-particle diffusion resistance. Here, we demonstrate the efficiency of a robust Prussian blue analogue/polyvinyl chloride composite membrane (PPM), which was easily prepared by a simple solvent evaporation method. In virtue of the less dense layer and ion-sieving functionality, it showed enhanced kinetics (5 h) and super selectivity (S_F = 248.3-5388.6) towards Cs⁺. New PPM was robust within a wide pH range (2-10) and exhibited favorable removal capacity (152.8 mg/g), placing it at an outstanding material for Cs⁺ removal among other adsorbents. Moreover, PPM could be simply eluted and reused using a KCl solution as eluent. A study of the adsorption mechanism confirmed an ion-exchange action during the removal process. Thus, PPM is considered to be a promising candidate for the removal of Cs⁺ from multicomponent aqueous solutions.

Keywords: (137)Cs removal; Adsorption kinetics; Membrane; Multicomponent aqueous solutions; Solvent evaporation.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Ferrocyanides
Hydrogen-Ion Concentration
Kinetics
Polyvinyl Chloride*
Solutions
Water Pollutants, Chemical* / analysis

Substances

Ferrocyanides
Solutions
Water Pollutants, Chemical
Polyvinyl Chloride
ferric ferrocyanide