Synthesis, characterization and application of a zirconium-based MOF-808 functionalized with isonicotinic acid for fast and efficient solid phase extraction of uranium(VI) from wastewater prior to its spectrophotometric determination

Abstract

Background A zirconium-based metal-organic framework (Zr-MOF), named MOF-808, was synthesized and fully characterized by solvo-thermal method and functionalized by isonicotinic acid and employed as an efficient adsorbent for selective extraction and preconcentration of uranyl ions from water and waste water samples in a batch solid phase extraction. Results Parameters affecting extraction such as volume and pH of the sample solution, the amount of sorbent, type and volume of eluting solvent, and adsorption and desorption times were investigated and optimized. Under the optimized conditions, high extraction efficiency was observed with a limit of detection of 0.9 µg L− 1 for uranyl ions and relative standard deviations were found to be better than 2.1% in the range of 0.07–1000 µg L− 1. Conclusions These results indicated that the above procedure is fast, inexpensive, effective, reliable, applicable and organic solvent-free and showed the highly performance and stability of the Zr-MOF in SPE based analytical techniques.

Non-Noble Metal-Doped MOF-808-Zr Nanostructures with Abundant Defects for Toluene Oxidation

“…The nanopores confer a strong affinity for the target molecule, while the inherent crystallinity and modularity of MOFs allow for the uniform design of structure and function at the molecular level. Compared to other materials, MOFs have some special performance advantages because of their porosity, high specific surface area, structural tunability, and unsaturated metal coordination; hence, they are used in applications for gas storage and separation, purification and molecular sensing, drug delivery, biomedicine, optics, magnetism, and catalysis. – One of the most notable applications of MOFs is homogeneous catalysis, wherein MOFs have several advantages as catalysts, such as increased catalytic activity and stability due to the presence of multiple catalytic sites in the backbone; the reaction substrate can easily reach the active site of the catalyst because of the nanospaces formed by pores and through metal coordination bonds. Materials with these properties are excellent candidates for the removal of VOCs. , Thus, the application of MOFs in catalysis is highly diverse and expanding.…”