Magnetic porous carbons derived from iron-based metal-organic framework loaded with glucose for effective extraction of synthetic organic dyes in drinks

The conversion of metal-organic frameworks (MOFs) to porous carbon has attracted extensive attention for developing multifunctional adsorbent materials. Herein, we demonstrated a facile method to prepare magnetic porous carbon via calcinating MIL-101(Fe) precursor loaded with glucose at 700 degrees C in an N-2 atmosphere. The obtained magnetic porous carbon (MPCG) contained plenty of oxygen-containing functional groups and exhibited an enlarged specific surface area (177.7 m(2)/g) compared with its precursor (41.2 m(2)/g). In addition, MPCG can be easily separated from the matrix by a magnet. Benefitting from these advantages, the magnetic porous carbon exhibited high affinity toward four synthetic organic dyes (amaranth, ponceau 4R, sunset yellow, and lemon yellow) in an aqueous solution. Moreover, the adsorbent can be applied to quantitatively detect synthetic organic dyes in drinks coupled with chromatography. A new magnetic solid-phase extraction method for dye analysis yielded reasonable linearity (r square 0.99), low limits of detection (0.047-0.076 mu g/L), and good precision within the analyte concentration range of 0.25-50 mu g/L. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

By calcinating MIL-101(Fe) loaded with glucose at 700 degrees C in an N-2 atmosphere, magnetic porous carbon with enlarged specific surface area and high affinity towards synthetic organic dyes can be prepared. This material can be easily separated and applied for adsorption and quantitative detection of synthetic organic dyes in aqueous solutions.