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A free nitrogen-containing Sm-MOF for selective detection and facile removal of mercury(II).

Authors :
Wu, Ning
Guo, Hao
Xue, Rui
Wang, Mingyue
Cao, Yujuan
Wang, Xiaoqiong
Xu, Mengni
Yang, Wu
Source :
Colloids & Surfaces A: Physicochemical & Engineering Aspects. Jun2021, Vol. 618, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

Mercury (Hg2+) is a highly hazardous and widespread environmental pollutant with bioaccumulative properties, so highly sensitive detection and effective removal of mercury in water environment are very necessary. Considering "soft base" property of N atom, N-containing organic groups cannot coordinate effectively with "hard acid" rare earth ions. A [Sm(ATPA) 1.5 (DEF)] n (Sm-MOF) (H 2 ATPA = 2-aminoterephthalic acid) containing free amino groups is constructed for simultaneous detection and removal of Hg2+ ions. Hg2+ can quench effectively the charge transfer emission of Sm-MOF in aqueous solution, and simultaneously induce the Sm3+ characteristic fluorescence emission of Sm-MOF. The results shows that the prepared Sm-MOF has an excellent selectivity and a high sensitivity for detecting Hg2+ with a wide linear range of 0.6–300 μM and a low detection limit of 0.87 μM. At the same time, the MOF is also employed to adsorb and remove Hg2+ in aqueous solution and it is found that over 97% of Hg2+ can be removed in approximately 2 h. [Display omitted] • Using Sm-MOF to detect and remove Hg2+ in aqueous solutions simultaneously. • 97% Hg2+ in aqueous solution was removed in 2 h. • The optical sensor delivered a low detection limit and a wide linear range. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09277757
Volume :
618
Database :
Academic Search Index
Journal :
Colloids & Surfaces A: Physicochemical & Engineering Aspects
Publication Type :
Academic Journal
Accession number :
149884781
Full Text :
https://doi.org/10.1016/j.colsurfa.2021.126484