Abstract
A Nickel coordination polymer, [Ni2(HBTC)2(NH2CONH2)2(H2O)4]·3H2O (Ni-BTC, H3BTC = 1,3,5-benzenetricarboxylic acid) was synthesized under ionothermal condition, which acted as parent framework to load Ln3+ (Ln3+ = Tb3+, Eu3+, Dy3+ and Sm3+) respectively from the ethanol solutions to prepare Ln3+-doped Ni-BTC (Ln3+@Ni-BTC) composites. The screened Tb3+@Ni-BTC displays bright green fluorescence and water stability, which was used to detect seventeen metal cations in their aqueous solutions, including Fe3+, Al3+, Li+, Na+, K+, Ag+, Mg2+, Ca2+, Ba2+, Zn2+, Mn2+, Cd2+, Co2+, Ni2+, Cr3+, Cu2+ and Hg2+. Tb3+@Ni-BTC showed a rapid fluorescence quenching to Fe3+. The sensitivity tests of Tb3+@Ni-BTC toward CFe3+ detection inferred a linear response of I0/I = 103673.4 × CFe3+ + 1.0844 at Fe3+ concentration ranging 1 × 10−6‒4 × 10−5 mol L−1 and limit of detection (LOD) calculated as 2.82 μmol L−1. Anti-inference tests also demonstrated Fe3+ cannot be interfered by other sixteen single metal cations or all metal cations as co-existed ions. The emission intensities at 543 nm of Tb3+ (5D4) can completely recover during the ten-time quenching-recovery cycle in the durability test. Tb3+@Ni-BTC can be regarded as a candidate of quantitative fluorescence sensor to Fe3+ detection with high sensitivity, anti-interference, rapid response and durability.
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