Asadevi Harisankar, Prasannakumaran Nair Chandrika Kumari Preethi, Padmavati Amma Rejani, Khadar Shahana Abdul, Charivumvasathu Sasi Saranya, Raghunandan Resmi
Post Graduate Department of Chemistry and Research Centre, Mahatma Gandhi College, University of Kerala, Thiruvananthapuram 695004, Kerala, India.
Department of Chemistry, NSS College Nilamel, University of Kerala, Kollam 691535, Kerala, India.
ACS Omega. 2022 Apr 7;7(15):13031-13041. doi: 10.1021/acsomega.2c00416. eCollection 2022 Apr 19.
Recently, the synthesis, characterization, and structural evaluation of metal-organic framework (MOF) nanocomposites gain more attention due to the versatility in their applications. In the present work, the fluorescent active ZnO@MOF-5 composite was synthesized by encapsulating ZnO nanoparticles into the zinc terephthalate metal-organic framework (MOF-5). ZnO nanoparticles were prepared by a green method using the leaf extract of . Incorporation of ZnO nanoparticles onto the framework structure (ZnO@MOF-5) was done by a solvothermal method. The new composite material was characterized by Fourier transform infrared spectroscopy, Powder X-ray diffraction, Ultraviolet-visible spectroscopy, Transmission Electron Microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller analysis, Dynamic light scattering, Thermogravimetry-Differential Thermal analysis, and Photoluminescence spectroscopy. The material displayed blue fluorescence with a peak at 402 nm upon excitation at 282.46 nm. ZnO@MOF-5 showed a good fluorescence sensing efficiency toward the detection as well as probing of Cu(II) ions in aqueous solution. Sensing experiments performed revealed that as the concentration of copper ions in the solution increases, the quenching efficiency of the composite also increases. A quenching efficiency of 96.20% was achieved on reaching a concentration of 5 μM. The limit of detection for the sensing of Cu ions was calculated to be 0.185 μM.
最近，金属有机框架（MOF）纳米复合材料的合成、表征及结构评估因其应用的多样性而备受关注。在本工作中，通过将ZnO纳米颗粒封装到对苯二甲酸锌金属有机框架（MOF-5）中合成了荧光活性ZnO@MOF-5复合材料。ZnO纳米颗粒采用绿色方法，利用[具体植物名称]的叶提取物制备。通过溶剂热法将ZnO纳米颗粒掺入框架结构（ZnO@MOF-5）中。采用傅里叶变换红外光谱、粉末X射线衍射、紫外可见光谱、透射电子显微镜、X射线光电子能谱、布鲁诺尔-埃米特-泰勒分析、动态光散射、热重-差热分析和光致发光光谱对新型复合材料进行了表征。该材料在282.46nm激发下呈现蓝色荧光，峰值在402nm。ZnO@MOF-5对水溶液中Cu（II）离子的检测及探测显示出良好的荧光传感效率。进行的传感实验表明，随着溶液中铜离子浓度的增加，复合材料的猝灭效率也增加。当浓度达到5μM时，猝灭效率达到96.20%。计算得出检测Cu离子的检测限为0.185μM。
