An amide groups functionalized Cd-MOF as multi-responsive luminescent sensor for detecting Fe3+, Cr2O72− and OTC in water media

Water pollution with toxic heavy metals or antibiotics poses significant safety risks to human survival and health. Luminescent metal–organic frameworks (LMOFs) as sensors can efficiently detect the above contaminants. Herein, a new 2D (two-dimensional) Cd-LMOF LCU-125 (LCU = Liaocheng University) has been fabricated by introducing rich amide active functional sites to serve as a multi-responsive luminescent sensor. As expected, LCU-125 can selective and sensitive sensing Fe3+, Cr2O72− and OTC (oxytetracycline) by quenching effect both in water and HEPES biological buffer solution. Notably, the detection limits (LODs) of Fe3+, Cr2O72− and OTC are as low as 0.0441/0.0084, 0.0849/1.38, and 1.46 μM (OTC in HEPES buffer), respectively. Moreover, a weak interaction quenching mechanism is proposed based on multiple experimental evidences.