Carbon-based beta cyclodextrin adsorbent for methylene blue and reactive orange 16 removal from water

Abstract

This aim of this work is to evaluate the adsorptive properties of carbon-based beta-cyclodextrin adsorbent towards Methylene Blue (MB) and Reactive Orange 16 (RO16) removal from water. The specific surface area of adsorbent is small (0.1 m2/g), with intact structure of pristine beta-cyclodextrin upon treatment. MB reaches relatively fast equilibrium (100 min), while RO16 needs more than 2200 min, despite a lower removal capacity of the former. Also, the adsorbent displays a greater affinity for MB. The kinetics data obeyed pseudofirst- order, suggesting the physical interaction of host-complex inclusion. On molar basis, the adsorption capacity of RO16 is 1.26 × 10-2 mmol/g (32 %), while that of MB is 6.8 × 10-3 mmol/g (20 %) at Co = 3.4 × 10-2 mM. To conclude, carbon-based beta-cyclodextrin is a promising adsorbent candidate for selective dyes removal from wastewater.