Highly selective capture of phosphate ions from water by a water stable metal-organic framework modified with polyethyleneimine
- 316 Downloads
In this work, a series of polyethyleneimine (PEI) impregnated metal-organic framework (UiO-66) with varying PEI loadings were prepared and applied as sorbents to capture phosphate ions from water. As indicated by SEM and XRD analysis, PEI was dispersed on the outer surface and the inner pores of UiO-66. At 9.45% PEI loadings (UiO-66-3), the saturated adsorption capacity of phosphate reached 73.15 mg P/g at 298 K, which is superior to most sorbents ever reported. UiO-66-3 could sequestrate phosphate over a wide pH range from 2.0 to 7.0 with high efficiency. The sorption toward phosphate reached equilibrium in 50 min. Unlike commercial anion exchanger IRA-900, UiO-66-3 still exhibited high removal toward phosphate even large amount of coexisted anions were present. Successive sorption assay demonstrated that the removal efficiency of UiO-66-3 toward phosphate remained constant after six cyclic runs. All the above results indicated the great potential of UiO-66-3 as a promising sorbent for the decontamination of water from phosphate.
KeywordsAdsorption Phosphate MOFs PEI
This work was financially supported by NSFC (21607080, 51608277, 11305091), Jiangsu NSF (BK20160946, BK20150892), and Jiangsu Higher Education Institution NSF (16KJB610011, 15KJB610012). Meanwhile, this research was supported by A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials, The Open Project of Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials (No. KFK1506), and the Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology (No. 2014r021).
- Attour A, Touati M, Tlili M, Amor MB, Lapicque F, Leclerc JP (2014) Influence of operating parameters on phosphate removal from water by electrocoagulation using aluminum electrodes. Sep Sci Technol 123:124–129Google Scholar
- Zhang QR, Teng J, Zou GD, Peng QM, Du Q, Jiao TF, Xiang JY (2016) Efficient phosphate sequestration for water purification by unique sandwich-like MXene/magnetic iron oxide nanocomposites. Nano 8(13):7085–7093Google Scholar