PAN/PVP/CD-MOF composite beads for the removal of Crystal Violet and Brilliant Blue G in water

Abstract

Cyclodextrin metal–organic frameworks (CD-MOFs) have a high surface area and unique coordination chemistry that enable them to be used as a carrier material for various materials. However, it is unstable in water, limiting its application in aqueous solutions. Here, we report the application of CD-MOFs in treating cationic and anionic dyes in water for the first time by forming a composite with polyacrylonitrile (PAN) and polyvinylpyrrolidone (PVP) to form composite beads. The composition of the composite beads was optimized through a Box-Behnken design of experiments. The optimum composition of PAN = 5.91 wt%, PVP = 1.89 wt%, and CD-MOF = 2.68 wt% yielded a CV and BB sorption capacities of 50.8109 ± 0.0634 mg/g and 28.5583 ± 0.1296 mg/g, respectively. The composite beads were characterized using SEM, EDX, and FTIR. We showed that CD-MOFs could be used as an adsorbent for wastewater treatment.