Characterization of zinc complex with 4-{[(1E)-(2 Hydroxyphenyl) methylidene]amino}-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one by FT-IR and FT-Raman spectroscopies and DFT calculations

Preparation of a Novel Zn(II)-Imidazole Framework as an Efficient and Regenerative Adsorbent for Pb, Hg, and As Ion Removal From Water

“…The peak at 526 cm −1 was derived from the Zn−N bond. 23 The outof-plane and in-plane bending modes of imidazole rings were clearly observed at 756 and 963 cm −1 , respectively. Figure 1b shows field-emission scanning electron microscopy (FESEM) images of Zn-MOF.…”

“…The peak at 1644 cm –1 was ascribed to the −CN– bond. The peak at 526 cm –1 was derived from the Zn–N bond . The out-of-plane and in-plane bending modes of imidazole rings were clearly observed at 756 and 963 cm –1 , respectively.…”

“…At the same time of deprotonation of the adsorbent, H 4 AsO 4 + is deprotonated and becomes H 2 AsO 4 – and HAsO 4. − Therefore, the elimination rate of AsO 4 3– is higher in the pH range from 3 to 5. So, the adsorption experiments of Hg 2+ , AsO 4 3– , and Pb 2+ were carried out at a pH of 4, 5, and 6, respectively.…”

“…2,5-thiophenedicarboxylate was used as the linker to construct S-MOFs for the reversible uptake of Cd­(II) with a maximum adsorption amount of 286 mg/g . The microporous zirconium-based MOF was successfully constructed by using meso-tetra­(4-carboxyphenyl)­porphyrin as a linker with an uncovered pyrrole Lewis base site and exhibited a maximum uptake amount of mercury ions of about 233.6 mg/g in water solution . Therefore, the tedious process of postmodification is overcome and the uptake capacity is improved by using the linker with a functional group to synthesize MOFs.…”

“…22 The microporous zirconium-based MOF was successfully constructed by using meso-tetra(4-carboxyphenyl)porphyrin as a linker with an uncovered pyrrole Lewis base site and exhibited a maximum uptake amount of mercury ions of about 233.6 mg/g in water solution. 23 Therefore, the tedious process of postmodification is overcome and the uptake capacity is improved by using the linker with a functional group to synthesize MOFs. In this study, 3-amino-5-mercapto-1,2,4-triazole with multiple active functional groups was used as the linker to synthesize a new Zn(II)-based MOF adsorbent for the elimination of lead, mercury, and arsenic from water.…”