Fabrication of novel ZIF‐67 Composite Microspheres for Effective Adsorption and Solid‐phase Extraction of Dyes from Water

Abstract

ZIFs type metal-organic frameworks have been found to rapidly remove organic contaminants from water by adsorption. But ZIFs crystals are not suitable to be directly used as stationary phases of solid-phase extraction (SPE) process, because of the non-spherical morphology. This study reports a novel composite adsorbent, ZIF-67 composite microspheres (ZIF-67 CMs), synthesized via in-situ growing ZIF-67 nanoparticles (ZIF-67 NPs) on the outer surface of resin microspheres (RMs). The assynthesized ZIF-67 CMs were characterized by SEM, XRD, FTIR, BET and TGA experiments, and the removal performance of the ZIF-67 CMs to anion dyes were investigated. It was found that the ZIF-67 CMs showing microsphere morphology were successfully assembled by growing ZIF-67 NPs on RMs and exhibited favorable performance to rapidly adsorptive remove two kinds of anion dyes (Brilliant Blue G and Congo red) from water. The removal rates of the ZIF-67 CMs to a 100 mg L À1 dye solution reached 95.9% and 99.1% in a 1 h and 5 h static adsorption, respectively. The ZIF-67 CMs showing rapid adsorption performance were further studied as stationary phases in SPE procedures for decolorizing dye solutions. The ZIF-67 CMs can efficiently remove more than 99% of dyes at a flow rate of 1.0 mL min À1 in a 5 min operation. The excellent SPE performance of ZIF-67 CMs indicates the potential applications for efficiently concentrating or purifying liquid mixtures by using ZIF-67 CMs or other ZIFs composite microspheres.[a] J.

Imidazole ionic liquid functionalized ZIF-67 molecularly imprinted solid-phase extraction coupled with high performance liquid chromatography for analysis of bisphenol A

“…Curve 1 is the same as the infrared spectrum of ZIF-67 in the reported literature, which proves that the preparation of ZIF-67 is successful. 25 The C-Br stretching vibration at 1085 cm À1 , the C-C stretching vibration at 1250 cm À1 , and the C]C stretching vibration at 1678 cm À1 in curve 2 proved that ZIF-67@[Bmim][Br] was successfully prepared. The peaks at 1500 cm À1 and 2173 cm À1 in curve 3 correspond to the N]N stretching vibration and C^N stretching vibration in azobisisobutyronitrile, and the peaks at 833 cm À1 and 1370 cm À1 correspond to the out-of-plane bending vibration and in-plane bending vibration of C-H in diol dimethacrylate respectively, and the peak at 1220 cm À1 corresponds to the C]O symmetric stretching vibration, which proved that ZIF-67@[Bmim][Br]@MIP was successfully prepared.…”

Effective Combination of the Metal Centers in MOF-Based Materials toward Sustainable Oxidation Catalysts

“…All the isolated materials were characterized by powder XRD, FTIR spectroscopy, SEM/EDS, and N 2 adsorption-desorption isotherms. The vibrational spectra of the materials depict that the main absorption bands are predictable from the MOF structures (Figure 2a): a very strong band observed around 420 cm −1 assigned to metal-nitrogen coordination, strong and weak bands from 600 up to 1500 cm −1 can be attributed to C-N ring bonds, and a weak vibration band seen at 1580 cm −1 is assigned to the C=N bond [33,34]. Additionally, in the composite materials (PMo 12 @ZIF-8, PW 12 @ZIF-8, and PMo 12 @ZIF-67) spectra, a group of medium intensity bands are evident in the interval from 770 to 975 cm −1 .…”

An efficient cheap source of activated carbon as solid phases for extraction and removal of Congo Red from aqueous solutions

“…The solid phase extraction method includes three basic stages, column preparation, loading, and elution [22,23]. The column of the polypropylene cartridge was prepared (Fig.…”