Li Chunhua, Zhang Xiaoshuo, Wen Simin, Xiang Rui, Han Yong, Tang Wenzhi, Yue Tianli, Li Zhonghong
College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China.
College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, Shaanxi, China.
J Hazard Mater. 2020 Aug 5;395:122615. doi: 10.1016/j.jhazmat.2020.122615. Epub 2020 Apr 7.
The increasing misgivings of environmental pollution derived from antibiotic residues make it imperative to explore a bifunctional platform for synchronous monitoring and removal of antibiotics. Herein, zeolite imidazolate framework-8 (ZIF-8) is anchored on two-dimensional (2D) amino-functionalized Al-metal organic framework (NH-MIL-53(Al)) nanoplates to construct a dual metal-organic frameworks smart platform (ZIF-8/NH-MIL-53(Al)) for simultaneous capture and fluorescence sensing of tetracyclines (TCs). ZIF-8 nanoparticles anchored on 2D nanoplates having a smaller size and a larger specific surface area boost the adsorption capabilities (561, 533, 526 and 578 mg g for doxycycline (DOX), tetracycline (TET), oxytetracycline (OTC) and chlortetracycline (CTC), respectively). Notably, the pyridine N of ZIF-8 cooperated with the abundant NH on the surface of NH-MIL-53(Al) exhibits high affinity toward TCs, remarkably enhancing the sensitivity by facilitating the photo-induced electron transfer and the inner-filter effect. The LODs (1.2 μg L for TET, DOX, OTC and 2.2 μg L for CTC, respectively) are at least 10-fold lower than those of NH-MIL-53(Al) and are comparable or superior to those of reported sensors. The dual metal-organic frameworks smart platform presents satisfactory reliabilities and accuracies for detecting TCs in real samples, which anticipates new routes to develop integrated systems for simultaneous capture and detection of organic pollutants.
抗生素残留所带来的环境污染问题日益引发人们的担忧，因此探索一种用于同步监测和去除抗生素的双功能平台变得势在必行。在此，将沸石咪唑酯骨架-8（ZIF-8）锚定在二维（2D）氨基功能化铝基金属有机骨架（NH-MIL-53(Al)）纳米片上，构建了一种双金属有机骨架智能平台（ZIF-8/NH-MIL-53(Al)），用于同时捕获和荧光传感四环素（TCs）。锚定在二维纳米片上的ZIF-8纳米颗粒尺寸更小、比表面积更大，从而提高了吸附能力（对强力霉素（DOX）、四环素（TET）、土霉素（OTC）和金霉素（CTC）的吸附量分别为561、533、526和578 mg g）。值得注意的是，ZIF-8的吡啶N与NH-MIL-53(Al)表面丰富的NH协同作用，对TCs表现出高亲和力，通过促进光致电子转移和内滤效应显著提高了灵敏度。检测限（TET、DOX、OTC的检测限分别为1.2 μg L，CTC的检测限为2.2 μg L）至少比NH-MIL-53(Al)低10倍，与已报道的传感器相当或更优。该双金属有机骨架智能平台在实际样品检测TCs时具有令人满意的可靠性和准确性，为开发同时捕获和检测有机污染物的集成系统开辟了新途径。
