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Antibiotic tetracycline (TC) is a sort of main contaminates in water, and of adverse effect on ecosystems and human health. The development of simple and efficient methods for both detection and removal of TC in water is highly desirable but remains challenging. Herein, a dual-functional platform for detection and removal of antibiotic tetracycline (TC) is developed by a highly stable luminescent zirconium-based MOF (PCN-128Y). The detection is based on the efficient luminescence quenching of the PCN-128Y toward TC. Theoretical/experimental studies reveal that the luminescence quenching can be attributed to a combined effect of the strong absorption of TC at the excitation wavelength and the photo-induced electron transfer process from the ligand of PCN-128Y to TC. The strong cheating metal-ligand bonding between Zr6 nodes and TC through solvent-assisted ligand incorporation is suggested to mainly account for the high adsorption capability of PCN-128Y toward TC in water. The preconcentration of TC within the pores of PCN-128Y induced by the adsorption process makes TC contact with the framework more sufficient, thus significantly enhances the efficiency of TC sensing. This work is the first example demonstrating that MOF materials can integrate the functions of detection and removal of antibiotic TC in water, which highlights the opportunity of luminescent MOFs in the application of wastewater treatment.

Confining metal-halide perovskites within MOF hosts not only protects them from exterior environment stimulation and isolates them from each other without aggregation, but also enables a variety of new features and applications. In this work, a hierarchically porous MOF host was firstly explored for in-situ confined growth of CsPbX3 perovskite nanocrystallites (PNCs). Compared with the previously used microporous MOF matrixes, this hierarchically porous MOF not only enables the impregnation of perovskite precursors in one step, but also allows more facile diffusion of the reactants, thus giving rise to high loading capacities and uniform distribution of CsPbX3 perovskites. The MOF matrix serves as both template to guide the confined growth of monodispersed CsPbX3 PNCs and encapsulation to enhance the stability of CsPbX3 PNCs. The obtained CsPbX3@MOF nanocomposites show bright luminescence and good resistance to ambient moisture, UV light irradiation, and anion-exchange. By integrating the green-emitting CsPbBr2I@MOF and red-emitting CsPbI3@MOF nanocomposites with a commercial blue InGaN LED chip, we fabricate a primary WLED showing a NTSC value of 125% and Rec. 2020 of 93%, which highlights the potential in backlight display.

An antibody free and signal-on type electrochemiluminescence(ECL) sensor was developed for diethylstilbestrol (DES) detection using magnetic surface magnetic molecular imprinting polymers (MMIPs) - aptamer labeled CdS quantum dots (CdS QDs) conjugated probes. Firstly, the MMIPs were synthesized through employing 4″-hydroxypropiophenone as mimicking template to form imprint sites on the poly-dopamine coating covering core-shell Fe3O4@SiO2 (MMIPs). Secondly, the aptamer which epitope is phenol group of 17β-estradiol (E2), was chosen to label on CdS QDs to form CdS-Apt signal tag and recognize phenol group of DES. When the target, MMIPs and CdS-Apt was incubated together, a sandwich MMIPs-DES-CdS-Apt composite was constructed. It was then adsorbed on the interface of a screen printed carbon electrode (SPCE) by external magnetic field, then emit electrochemical luminescence signal at potential − 1.1 V. The signal intensity was in proportion to the logarithm of DES' concentration from 0.3 to 1.0 × 105 pg ml− 1, with the detection limit (LOD) of 0.1 pg ml− 1 (S/N = 3). Several fish samples were tested by the sensor which showed high selectivity and good recoveries between 80% and 120% with consistent results as that of conventional ELISA. Since there have been no reports of aptamer for DES, we use E2 aptamer to recognize phenol epitope of DES, then MMIPs towards another epitope to form a sandwich complex. Thus a signal-on and sandwich sensor was fabricated. Moreover, no expensive antibody was employed for fabricating the sensor. Its selectivity and sensitivity were higher than the same type of sensor based on sole aptamer or MIPs probe. The assay can be explored to detect other analytes while changing the corresponding aptamer and imprinting template.