Use of α-cyclodextrin to Promote Clean and Environmentally Friendly Disinfection of Phenolic Substrates via Chlorine Dioxide Treatment

Abstract

The use of chlorine dioxide to disinfect drinking water and ameliorate toxic components of wastewater has significant advantages in terms of providing safe water. Nonetheless, significant drawbacks toward such usage remain. These drawbacks include the fact that toxic byproducts of the disinfection agents are often formed, and the complete removal of such agents can be challenging. Reported herein is one approach to solving this problem: the use of α-cyclodextrin to affect the product distribution in chlorine dioxide-mediated decomposition of organic pollutants. The presence of α-cyclodextrin leads to markedly more oxidation and less aromatic chlorination, in a manner that is highly dependent on analyte structure and other reaction conditions. Mechanistic hypotheses are advanced to explain the cyclodextrin effect, and the potential for use of α-cyclodextrin for practical wastewater treatment is also discussed.

Comparison of three cyclodextrins to optimize bisphenol A extraction from source water: Computational, spectroscopic, and analytical studies

“…It can be observed that this effect is more pronounced for β-CD-BPA complex. This was also true for the decrease of the band corresponding of the CD glucose ring breath vibration observed at 859 cm −1 , evidenced for the complexes [47]. BPA interaction with CDs also lead to characteristic changes observed in its IR spectrum signals.…”

“…Single aromatic ring compounds reported to bind strongly to α‐CD [41, 42], and larger (and hydrophobic) aliphatic aromatic compounds reported to bind β‐CD [43, 44]. In the case of 𝛄‐CD, it can form ternary complexes, where two small guest molecules bind simultaneously within the larger γ‐CD nucleus [45–47]. The BPA molecule has a size of 9.61 Å, in the present study it was possible to evaluate the different CDs in different configurations inside and outside the cavity.…”

“…Single aromatic ring compounds reported to bind strongly to α-CD [41,42], and larger (and hydrophobic) aliphatic aromatic compounds reported to bind β-CD [43,44]. In the case of 𝛄-CD, it can form ternary complexes, where two small guest molecules bind simultaneously within the larger γ-CD nucleus [45][46][47]. The In the study of α-CD with BPA, different configurations were performed, where the BPA molecule interacted with the interior (entering through the larger and smaller parts) and the exterior of the BPA cavity.…”