Synthesis of magnetic metal-organic framework (MOF) for efficient removal of organic dyes from water

Abstract

A novel, simple and efficient strategy for fabricating a magnetic metal-organic framework (MOF) as sorbent to remove organic compounds from simulated water samples is presented and tested for removal of methylene blue (MB) as an example. The novel adsorbents combine advantages of MOFs and magnetic nanoparticles and possess large capacity, low cost, rapid removal and easy separation of the solid phase, which makes it an excellent sorbent for treatment of wastewaters. The resulting magnetic MOFs composites (also known as MFCs) have large surface areas (79.52 m2 g−1), excellent magnetic response (14.89 emu g−1), and large mesopore volume (0.09 cm3 g−1), as well as good chemical inertness and mechanical stability. Adsorption was not drastically affected by pH, suggesting π–π stacking interaction and/or hydrophobic interactions between MB and MFCs. Kinetic parameters followed pseudo-second-order kinetics and adsorption was described by the Freundlich isotherm. Adsorption capacity was 84 mg MB g−1 at an initial MB concentration of 30 mg L−1, which increased to 245 mg g−1 when the initial MB concentration was 300 mg L−1. This capacity was much greater than most other adsorbents reported in the literature. In addition, MFC adsorbents possess excellent reusability, being effective after at least five consecutive cycles.

Removal of Colored Organic Pollutants from Wastewaters by Magnetite/Carbon Nanocomposites: Single and Binary Systems

“…The adsorption capacity increases as the temperature increases [32], suggesting that dyes adsorption onto PM-4 is an endothermic process [30,33]. This can be explained by the fact that by increasing the temperature the dye aggregation is reduced and the diffusion of dye molecules into the pores of the absorber is facilitated [34,35].…”

A magnetically-separable H 3 PW 12 O 40 @Fe 3 O 4 /EN-MIL-101 catalyst for the one-pot solventless synthesis of 2H-indazolo[2,1- b ] phthalazine-triones

“…The attachment of magnetic nanoparticles to inorganic and organic backbones and fabrication of magnetic metal-organic frameworks (MMOFs) [16] unlocks opportunities to create novel multifunctional catalysts [17] amenable to facile separation and recycling.…”

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

“…Metal-Organic Frameworks (MOFs) with ordered networks, welldefined pores and large surface area have been widely used in many fields such as sensing, drug delivery, gas adsorption and so on ( Kreno et al, 2012;Patricia et al, 2010;Schlichte et al, 2004;Zhao et al, 2015) . In general, MOFs are utilized as Lewis acid catalysts due to their acidic metal center (Dhakshinamoorthy and Garcia, 2012;Mitchell, 2013), high surface area and tunable porosity.…”