Verma Rajpal, Dhingra Gaurav, Kaur Manpreet, Garg Deepika, Mohiuddin Irshad, Malik Ashok Kumar
Department of chemistry, Punjabi university, Patiala, 147002, Punjab, India.
Presently associated with Dr. B. R. Ambedkar Govt. college Dabwali, Sirsa, Haryana, India.
J Fluoresc. 2023 Sep;33(5):2085-2098. doi: 10.1007/s10895-023-03216-0. Epub 2023 Mar 29.
An amine-decorated zirconium based metal organic framework (MOF) UiO-66-NH with rod shape morphology was synthesized by solvothermal process using 2-aminoterephthalic acid as an organic linker. Crystallinity of synthesized MOF material was confirmed with PXRD technique. MOF was employed as selective and sensitive sensor for ultra-trace detection of 2,4,6-trinitrophenol (TNP) in aqueous matrix, even in coexistence with other competitive nitroaromatic analytes. High value of Stern-Volmer quenching constant K (1.106 × 10 M), plausible photoluminescent quenching efficiency (97.8%) and lower detection limit (0.95 µM/217ng mL) ascertained extraordinary sensitivity of developed MOF for TNP. Density functional theory calculations and electrostatic interactions (i.e. ionic interaction, H-bonding and π-π interaction) indicated that electron and energy transfer processes play a key role in turn-off quenching response of UiO-66-NH sensor. Spiked real samples were analysed to validate the developed method, which satisfactorily established the developed MOF sensor as an efficient tool for analysis.
以2-氨基对苯二甲酸为有机连接体，通过溶剂热法合成了具有棒状形态的胺修饰锆基金属有机框架材料（MOF）UiO-66-NH。采用PXRD技术确认了合成的MOF材料的结晶度。MOF被用作选择性和灵敏的传感器，用于在水基质中对2,4,6-三硝基苯酚（TNP）进行超痕量检测，即使在与其他竞争性硝基芳香族分析物共存的情况下也能检测。Stern-Volmer猝灭常数K的高值（1.106×10 M）、合理的光致发光猝灭效率（97.8%）和较低的检测限（0.95 μM/217 ng mL）确定了所开发的MOF对TNP具有非凡的灵敏度。密度泛函理论计算和静电相互作用（即离子相互作用、氢键和π-π相互作用）表明，电子和能量转移过程在UiO-66-NH传感器的猝灭响应中起关键作用。对加标实际样品进行分析以验证所开发的方法，该方法令人满意地将所开发的MOF传感器确立为一种有效的分析工具。
