Synthesis and application of Zr-metal-organic framework for simultaneous detection and rapid adsorption of p-nitrophenol from water

The p-nitrophenol is a prime raw material in the manufacturing of pharmaceutical drugs, fungicides and insecticides. The effluents from these industries contain p-nitrophenol and are harmful to human and aquatic life. Hence, development of fast detection and efficient disposal process of p-nitrophenol in wastewater is a major concern. In this study, fluorescent active smart metal-organic framework (MOF) was employed for the simultaneous detection and adsorptive removal of p-nitrophenol from water. Photoluminescence active zirconium-based metal-organic framework having isostructural with UiO-66 framework was synthesized by using mixed ligand strategy with the replacement of BDC (1,4-Benzenedicarboxylic acid) ligand from 10 to 30 mol% with H(3)ntb ligand (4,4',4 ''-Nitrilotrisbenzoic acid, in house synthesised fluorescence active trifunctional ligand). The powder X-ray diffraction (PXRD), analysis of the synthesised MOF confirms face centred cubic (FCC) crystal structure similar to pristine UiO-66. From Fourier transform infrared spectroscopy (FTIR), the peak at 1251 cm(-1) for the tertiary amine group validated the presence of H(3)ntb ligand. The obtained MOFs have the surface area from 1039 m(2)g(-1) to 949.1 m(2)g(-1) and pore volume ranging from 0.04973 cm(3)g(-1) to 0.05160 cm(3)g(-1). Experimental results indicated that MOF was able to detect p-nitrophenol at low concentration (approximate to 35 mu M) and to remove rapidly (< 10 min) it from the aqueous solution. The adsorption process obeys Langmuir isotherm (monolayer adsorption capacity is 62 mgg(-1)) and kinetics by Elovich model indicating adsorption nature as chemisorption on a heterogeneous surface.