Jia Wenwen, Fan Ruiqing, Zhang Jian, Zhu Ke, Gai Shuang, Yin Yuanyuan, Yang Yulin
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
Small. 2022 May;18(19):e2201510. doi: 10.1002/smll.202201510. Epub 2022 Apr 7.
The immoderate use of pesticides in the modern agricultural industry has led to the pollution of water resources and ultimately threatens the human body. Herein, two metal-organic frameworks (MOFs), namely {[Zn(tpt) ·2H O]} (Zn1) and {[Zn (tpt) (bdc)]} (Zn2), (Htpt = 5-[4(1H-1,2,4-triazol-1-yl)]phenyl-2H-tetrazole), respectively, are constructed as smart materials for visual and on-site detection of pesticides and their removal from water. The exposed nitrogen-rich sites and high chemical stability make Zn2 a self-assembly core to further fabricate MOF-on-MOF-sodium alginate (ZIF-8-on-Zn2@SA) composite by wrapping ZIF-8 on the outside surface. Inheriting the excellent fluorescent emission of Zn2, the rod-like ZIF-8-on-Zn2@SA module exhibits naked-eye detection of thiophanate-methyl (TM) in real fruits and vegetables with a broad linear range (10-100 × 10 m), a low limit of detection (LOD = 0.14 × 10 m), and satisfactory recoveries (98.30-102.70%). In addition, carbendazim (CBZ), the metabolite of TM after usage in crops, can be efficiently removed from water by the ZIF-8-on-Zn2@SA (q = 161.8 mg g ) with a high correlation coefficient (R > 0.99). Therefore, the portable ZIF-8-on-Zn2@SA sensing platform presents a promising candidate for monitoring and removal of pesticides, especially suitable for regions with serious pesticide environmental pollution.
现代农业产业中农药的过度使用导致了水资源污染，并最终威胁到人体健康。在此，分别构建了两种金属有机框架（MOF），即{[Zn(tpt)·2H₂O]}（Zn1）和{[Zn₂(tpt)(bdc)]}（Zn2）（Htpt = 5-[4(1H-1,2,4-三唑-1-基)]苯基-2H-四唑），作为用于可视化现场检测农药及其从水中去除的智能材料。富含氮的暴露位点和高化学稳定性使Zn2成为自组装核心，通过在其外表面包裹ZIF-8进一步制备MOF-on-MOF-海藻酸钠（ZIF-8-on-Zn2@SA）复合材料。继承了Zn2优异的荧光发射性能，棒状的ZIF-8-on-Zn2@SA组件在真实水果和蔬菜中对甲基硫菌灵（TM）具有肉眼可检测性，线性范围宽（10 - 100×10⁻⁶ m），检测限低（LOD = 0.14×10⁻⁶ m），回收率令人满意（98.30 - 102.70%）。此外，多菌灵（CBZ）是TM在作物中使用后的代谢产物，ZIF-8-on-Zn2@SA可以将其从水中高效去除（qₘₐₓ = 161.8 mg g⁻¹），相关系数高（R² > 0.99）。因此，便携式ZIF-8-on-Zn2@SA传感平台是监测和去除农药的有前途的候选者，特别适用于农药环境污染严重的地区。
