Preparation of Magnetic MIL-68(Ga) Metal–Organic Framework and Heavy Metal Ion Removal Application

Abstract

A magnetic metal–organic framework nanocomposite (magnetic MIL-68(Ga)) was synthesized through a “one pot” reaction and used for heavy metal ion removal. The morphology and elemental properties of the nanocomposite were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), X-ray powder diffraction (XRD), as well as zeta potential. Moreover, the factors affecting the adsorption capacity of the nanocomposite, including time, pH, metal ion type and concentration, were studied. It was found that the adsorption capacity of magnetic MIL-68(Ga) for Pb2+ and Cu2+ was 220 and 130 mg/g, respectively. Notably, the magnetic adsorbents could be separated easily using an external magnetic field, regenerated by ethylenediaminetetraacetic acid disodium salt (EDTA-Na2) and reused three times, in favor of practical application. This study provides a reference for the rapid separation and purification of heavy metal ions from wastewater.

Gallium-based metal–organic frameworks loaded with antimicrobial peptides for synergistic killing of drug-resistant bacteria

“…1e). 36,37 The MEL loading capacity of MOFC was obviously higher than that of our previously reported MOF-MEL nanocomposite as about 90% of MEL was loaded in the MM, 15 and the final loading capacity was 45%. To investigate the MEL release capacity, the as-prepared MM was incubated in PBS buffer (pH 7.4) and MES buffer (pH 6.0), respectively.…”

“…S1, ESI†), which was similar to our previously synthesized MIL-68(Ga). 37 In the presence of CTAB, the obtained MOFC became an irregular shape, with some short and sharper rod like particles, and the size was less than 1 μm (Fig. 1a).…”

“…Traditionally, Ga-based MOFs were prepared via the solvothermal method using autoclaves at high temperature, making it difficult to achieve one-step drug loading. 37 To solve this problem, we changed the organic ligand from 1,4-dicarboxybenzene to disodium terephthalate (Na 2 BDC), 38 and Ga-based MOFs could be easily synthesized by simply mixing Na 2 BDC and Ga(NO 3 ) 3 at room temperature in the aqueous phase (M0). In order to reduce the size of the MOF and improve its stability, we further introduced the surfactant CTAB during synthesis.…”