Magnetization of a Cu(II)-1,3,5-benzenetricarboxylate metal-organic framework for efficient solid-phase extraction of Congo Red

Abstract

We describe a facile method for the preparation of magnetic microparticles consisting of a metal-organic framew o r k ( M O F ) o f C u ( I I ) -B T C ( B T C = 1 , 3 , 5 -benzenetricarboxylate) for rapid magnetic solid-phase extraction (MSPE) of the dye Congo Red (CR) from aqueous solution. Magnetization of the MOF and solid-phase extraction of CR was simultaneously accomplished by mixing, under ultrasonication, the MOF and silica-coated magnetite microparticles in the solution to be extracted. Under optimized conditions, the magnetic MOF hybrid exhibits a fast adsorption rate and a high removal efficiency (>97 %) toward CR even over 15-fold reuse, which also features high adsorption capacity of 97.7 and 92.5 % for cationinc Methylene Blue (MB) and Crystal Violet (CV), respectively. The desorption of CR from the magnetic MOF was realized by washing it with ethanol and water. The material is considered to be a promising new adsorbent for use in wastewater treatment and in analytical preconcentration.

Rapid magnetic solid‐phase extraction of Congo Red and Basic Red 2 from aqueous solution by ZIF‐8@CoFe2O4 hybrid composites

“…According to the pH effect on the zeta potential of MOF ZIF‐8 , the surface charge of MOF ZIF‐8 is positive at pH 5–10. The CR dye usually exists in negative form for pH ≥ 5.5 . Thus, high electrostatic interaction between positive charge of ZIF‐8 and negative charge of CR dye molecular favors the adsorption.…”

“…Magnetic solid-phase extraction (MSPE) is a new mode of SPE based on the magnetization of adsorbents which can be easily separated and purified during the synthesis and application process by introducing an extra magnetic field [22][23][24][25][26][27][28][29]. Magnetic core-shell MOF hybrids are rarely used in MSPE because controlling the heterogeneous growth of MOF crystals on the surface of magnetic nanoparticles remains a great challenge.…”

Eco-Efficient Green Seaweed Codium decorticatum Biosorbent for Textile Dyes: Characterization, Mechanism, Recyclability, and RSM Optimization

“…The equilibrium constant ( K e °) was expressed as 61 , 62 where K L (L/mg) is the Langmuir equilibrium constant, R is the universal gas constant (8.314 J/K·mol), T is the investigated temperature in Kelvin, M (Adsorbate) is the molecular weight of the dye, γ represents the coefficient of activity, and [Adsorbate]° denotes the standard concentration of the solute (1 mol/L).…”

Dye contaminated wastewater treatment through metal–organic framework (MOF) based materials

“…133 Afterward, Xu et al have described a facile method for the synthesis of a magnetic MOF (Cu(II)-1,3,5-benzenetricarboxylate) for the adsorption of dyes like CR, MB, and CV with a decolourization efficiency of 497%, 97.7% and 92.5% respectively. 134 Cu-BTC@GO was synthesized using a hydrothermal method using GO as a carrier, Cu 2+ , and trimesic acid for linking Fe 4 O 3 to the MOF surface. The Cu-BTC@GO/Fe 4 O 3 magnetic composite is used for adsorptive removal of MB from dye contaminated wastewater.…”