The increasing concern about tetracyclines (TCs) contamination brings out the development of multifunctional materials to sensitively detect and effectively remove TCs. Herein, a novel Eu-Luminol/ZIF-8 (Eu-L/ZIF-8) heterojunction is rationally designed for the simultaneous capture and ratiometric sensing of TCs. The large specific surface area, hollow and multiple pore structure of Eu-L/ZIF-8 boost the enhanced adsorption for tetracycline (TC, 1115.3 mg g), oxytetracycline (OTC, 869.6 mg g) and doxycycline (DOX, 862.1 mg g). Meanwhile, sensitive ratiometric sensing of TCs is realized by gathering TCs around the sensing center of Eu-L to induce the fluorescence turn-on of Eu (615 nm) and quenching of luminol (435 nm). The detection limit is 5 nM for TC and OTC, 10 nM for DOX, respectively. Furthermore, Eu-L/ZIF-8 is fabricated to mixed matrix membranes (MMMs) for the portable visual sensing and online removal of TCs. The portable sensing of TCs is conducted by a homemade testing kit within 10 min, and the online removal of TCs is realized with a removal efficiency above 90 % in real wastewater. The results demonstrate that Eu-L/ZIF-8 MMMs is a powerful tool for the portable sensing and simultaneous removal of TCs.

中文翻译：

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空心球形 Eu-Luminol/ZIF-8 混合基质膜的定制设计，用于同时比率传感和增强四环素的吸附


人们对四环素 (TC) 污染的日益关注促进了多功能材料的开发，以灵敏地检测并有效去除 TC。在此，合理设计了一种新型 Eu-Luminol/ZIF-8 (Eu-L/ZIF-8) 异质结，用于同时捕获和比率传感 TC。 Eu-L/ZIF-8的大比表面积、中空和多孔结构促进了对四环素（TC，1115.3 mg g）、土霉素（OTC，869.6 mg g）和强力霉素（DOX，862.1 mg g）的增强吸附。同时，通过将TC聚集在Eu-L传感中心周围，诱导Eu（615 nm）的荧光开启和鲁米诺（435 nm）的荧光猝灭，实现了TC的灵敏比例传感。 TC 和 OTC 的检测限分别为 5 nM，DOX 的检测限分别为 10 nM。此外，Eu-L/ZIF-8 被制成混合基质膜 (MMM)，用于便携式视觉传感和在线去除 TC。通过自制测试套件，在10分钟内完成TCs的便携式传感，实现了TCs的在线去除，对实际废水的去除率达到90%以上。结果表明，Eu-L/ZIF-8 MMM 是便携式传感和同时去除 TC 的强大工具。