Selective Th(iv) capture from a new metal–organic framework with O− groups. Issue 13 (4th March 2020)

• Record Type: Journal Article
• Authors: Guo, Xiang-Guang; Su, Jia; Xie, Wen-Qi; Ni, Shuai-Nan; Gao, Yun; Su, Xiang; Sun, Xiao-Qi
• Is Part Of: Dalton transactions. Volume 49:Issue 13(2020)
• Page Start: 4060
• Page End: 4066
• Publication Date: 2020-03-04
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9dt04912f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : New MOF adsorbent with functional N + –O − groups was designed. The material shows fast adsorption of Th(iv ) and high removal efficiency, and is selective over La(iii ), Sm(iii ), Ho(iii ), Cd(ii ), Pb(ii ) and K(i ) ions. Abstract : Herein we report a new 4-fold interpenetrated metal–organic framework (MOF) functionalized with O − groups for selective Th(iv ) capture, the activated samples 1a exhibited a high adsorption capacity for pure Th(iv ) ions ( K d = 3.16 × 10 5 mL g −1 ) and the amount of metal ions adsorbed on the adsorbent was 165.61 mg g −1 . A high removal efficiency of 99.75% was achieved within 10 min with an initial Th(iv ) concentration of 100 mg L −1 and the adsorption data followed the pseudo-second-order model. In addition, the separation coefficient ( S ) of Th(iv ) to metal ions with different valence states such as Th(iv )/La(iii ), Th(iv )/Sm(iii ), Th(iv )/Ho(iii ), Th(iv )/Cd(ii ) and Th(iv )/K(i ) achieved values of 19.66, 26.83, 16.90, 11.26 and 255.79, respectively. Even given the fact that MOFs with O − groups showed high affinity for Pb(ii ) ions, our adsorption studies for compound 1a revealed a separation coefficient ( S Th(IV)/Pb(II) ) of 4.36. Further, the adsorption of Th(iv ) ions to compound 1a was investigated by FT-IR, SEM-EDS and XPS.