Zirconium-based cyclodextrin porous coordination polymer for highly efficient uptake of Cr(VI) species

Abstract

Zirconium-based porous coordination polymers (Zr-PCPs) have been of great interest recently thanks to their exceptional stability and unique properties. In this work, for the first time, a new biocompatible PCP, here so-called CCD-PCP, was synthesized by solvothermal method from carboxymethyl-β-cyclodextrin (CCD), a naturally occurring cyclic oligosaccharide derived from starch, and zirconium chloride as precursors. Various characteristics techniques confirm the synthesis of a porous organic–inorganic polymer. The cyclodextrin-based PCP containing hollow voids and abundant hydroxyl groups was then examined as a porous adsorbent for toxic chromium ions captured from water samples. Parameters affecting the extraction of Cr(VI) ions such as pH, amount of adsorbent, extraction time, type and volume of eluent solvent, and desorption time were considered. Under optimum conditions, the limit of detection was obtained at 1.2 µg L-1 and the relative standard deviation was lower than 2.1%. Maximum adsorption capacity (432.2 mg/g) was higher as compared to other adsorbents.