Influences of Various Cyclodextrins on the Photodegradation of Phenol and Bisphenol A under UV Light

Abstract

Recently, the removal of phenolic compounds has attracted great attention in wastewater treatment. In this work, the influences of various cyclodextrins (CDs) on the photodegradations of phenol and bisphenol A (BPA) under UV light were investigated systematically. The results show that the photodegradation of phenol displays no obvious differences in the presence or absence of CDs. In contrast, BPA photodegradation increases considerably in the presence of β-CD and its derivatives. Moreover, the catalytic effects of BPA differed among α-CD, β-CD, carboxymethyl-β-CD (CM-β-CD), and hydroxypropyl-β-CD (HP-β-CD), following the order β-CD ≈ HP-β-CD > CM-β-CD > α-CD. Specifically, over 99% of the BPA was degraded in the HP-β-CD and β-CD systems within 120 min. Additionally, six main intermediates of BPA in the presence of β-CD were confirmed, and the probable degradation pathway was proposed, which provides a useful platform for the application of CDs in the photodegradation of BPA.

Citric acid modified waste cigarette filters for adsorptive removal of methylene blue dye from aqueous solution

“…Freundlich isotherm model is an empirical equation that assumes the heterogeneity of the surface and adsorption occurs at sites having different energy levels 36 …”

Bisphenol A Adsorption on Silica Particles Modified with Beta-Cyclodextrins

“…The drawbacks of these methods are strongly related sometimes with the rigorous control of parameters in the case of biological or advanced oxidation procedures and laborious or expensive synthesis methods for membranes [ 35 , 36 ]. These circumstances have driven the attention of researchers to the design of CDs-based inclusion complexes that could be used to adsorb the BPA molecules from the polluted environment [ 37 , 38 , 39 , 40 ].…”

Adsorption of the anionic dye (Diamond Fast Brown KE) from textile wastewater onto chitosan/montmorillonite nanocomposites

“…With the introduction of strict environmental legislation regarding colour limits of industrial effluent discharge in many regions of the Middle East, the need for an effective process that efficiently remove colour is now a top priority [5]. Several methods based on distillation [6], biodegradation [7], membrane technologies [8], photocatalysis [9,10], and adsorption [11] have been employed for the polluted water treatment. Amongst them, adsorption technique is regarded as an effective and inexpensive water remediation technique [12,13].…”