A Sonochemically-Synthesized Microporous Metal-Organic Framework for the Rapid and Efficient Ultrasonic-Assisted Removal of Mercury (II) Ions in a Water Solution and a Study of the Antibacterial Activity

Abstract

Nowadays, water pollution due to heavy metal ions is a great concern in all human communities. In this project, a metal-organic frameworks (MOFs), which were named Zn2(oba)2bpy, (1; H2oba = 4,4-oxybisbenzoic acid and bpy = 4,4-bipyridine) linkers, were successfully synthesized. The properties of these MOFs were investigated using different techniques, such as FT-IR, XRD, and SEM analysis. The frameworks have special characteristics, like the rapid, efficient, and selective removal of metal ions from contaminated water. The use of an ultrasonic device plays an important role in shortening the absorption time of mercury (II) ions by increasing absorbent dispersion in the solution. The adsorption capacity was affected by variables such as the pH of the solution, Hg2+ initial concentration, adsorbent dosage, and contact time. For Hg(II) metal ions, the sorption capacity of 338 mgg−1 was effectively obtained by Zn2(oba)2bpy structures. The experimental adsorption data for the Zn2(oba)2bpy MOF is well-suited to the pseudo-second-order kinetic model (R2 = 0.99), and the adsorption isotherms of Hg2+ metal ions are in good agreement with the Langmuir model. This work displays the effective removal of Hg2+ ions from pollutant water in under 30 min. The antibacterial activities of Zn2(oba)2bpy (1) were tested against gram-positive and gram-negative species. The as-synthesized 1 exhibited excellent antibacterial effectiveness against Escherichia coli and Staphylococcus aureus.

Optimization of a lipase/reduced graphene oxide/metal–organic framework electrode using a central composite design-response surface methodology approach

“… 38 Agglomeration of Cu-MOF was exhibited after integration using ultrasonication. Although it was reported that ultrasonication reduced the MOF size, 39 it may cause agglomeration due to the molecular collisions of the Cu-MOF.…”

Current trends in the synthesis, characterization and application of metal-organic frameworks

“…The sonochemical synthesis of 3D microporous [Zn 2 (oba) 2 (bpy)] ( 1 ; H 2 oba = 4,4-oxybisbenzoic acid and bpy = 4,4-bipyridine) linkers has been reported by Moradi et al 86 for the development of luminescence sensors for the detection of Fe 3+ ions. The obtained photoluminescence intensity was sensitive to the type of solvent used, with MeOH showing the best performance among other solvents (ethanol, acetonitrile, THF, DMF, water).…”