Branched polyethylenimine‐polyethylene glycol‐β‐cyclodextrin polymers for efficient removal of bisphenol A and copper from wastewater

Abstract

The present study reports on the development of water-insoluble polymers including β-cyclodextrin (β-CD), polyethylene glycol (PEG), and branched polyethylenimine (b-PEI) denoted here as X-CD, for efficient removal of bisphenol A (BPA) and copper ions (Cu(II)) from wastewater. Fourier-transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, and differential scanning calorimetry results indicate that β-CD was successfully linked to b-PEI and PEG. The adsorption kinetics of BPA and Cu(II) were found to follow a pseudo-second-order model. Adsorption isotherm data showed good correlation of BPA and Cu(II) with the Langmuir isotherm models. In regeneration tests, using ethanol and DI water (pH 2) washing, X-CD exhibited sufficient BPA and Cu(II) recovery efficiency even after the fourth cycle. Furthermore, the adsorption performance of X-CD was unaffected by co-existing substances. The results demonstrate simple and environmentally friendly crosslinking without toxic/carcinogenic byproducts, and the efficient removal of endocrine disrupting chemicals and heavy metals from aquatic environments.

Supramolecular Assembly of β-Cyclodextrin-Modified Polymer by Electrospinning with Sustained Antibacterial Activity

“…The stretching vibration peaks of CH 2 were at 2931 and 2807 cm –1 ; the in-plane bending vibration peaks of CH 2 were at 1454 cm –1 ; the NH bending vibration peaks of secondary amine were at 1590 cm –1 ; and the C–N stretching vibration peaks of primary amine and secondary amine were at 1349–1044 cm –1 . For β-CD-PEI, in addition to the characteristic peaks of PEI, the IR bands around 1567, 1152, 1028, and 937 cm –1 were due to the glucopyranose ring stretching vibration band, the coupled ν­(C–C/C–O) stretching vibration, antisymmetric glycosidic νa­(C–O–C) vibrations, and the R-1,4-bond skeleton vibration of β-CD . For Dox@β-CD-PEI, in addition to the characteristic peaks of PEI and β-CD, the peak at 1667 cm –1 was assigned to CO, the peak at 706 cm –1 was assigned to CC, the peaks at 1614 cm –1 , 1580 cm –1 , and 1455 cm –1 were assigned to the vibration of the benzene ring skeleton, and the peak at 575 cm –1 were assigned to the deformation vibration of the benzene ring skeleton.…”

“…36 For β-CD-PEI, in addition to the characteristic peaks of PEI, the IR bands around 1567, 1152, 1028, and 937 cm −1 were due to the glucopyranose ring stretching vibration band, the coupled ν(C−C/C−O) stretching vibration, antisymmetric glycosidic νa(C−O−C) vibrations, and the R-1,4-bond skeleton vibration of β-CD. 37 For Dox@β-CD-PEI, in addition to the characteristic peaks of PEI and β-CD, the peak at 1667 cm −1 was assigned to CO, the peak at 706 cm −1 was assigned to C C, the peaks at 1614 cm −1 , 1580 cm −1 , and 1455 cm −1 were assigned to the vibration of the benzene ring skeleton, and the peak at 575 cm −1 were assigned to the deformation vibration of the benzene ring skeleton. The above results prove that Dox was loaded on β-CD-PEI.…”

Facile Sonochemical Synthesis of Flexible Fe-Based Metal–Organic Frameworks and Their Efficient Removal of Organic Contaminants from Aqueous Solutions

“…The types of simultaneous adsorption can be categorized as synergism ( R q > 1), antagonism ( R q < 1), and noninteraction ( R q = 1) according to the literature. 60 …”

Oligomer Sensor Nanoarchitectonics for “Turn-On” Fluorescence Detection of Cholesterol at the Nanomolar Level

“…Generally, CDs exist in three forms, as α-CD, β-CD, and γ-CD, consisting 6, 7, and 8 D-glucose subunits, respectively [26]. Out of these three forms, β-cyclodextrin (β-CD) was identified as a prime building block for functionalizing nano-units to be integrated into nanoarchitectonic systems, [27][28][29] granting them selective adsorption and controlled release abilities towards organic molecules [30][31][32]. β-CD is widely known for its strong affinity towards cholesterol and for its use in extraction of cholesterol from body fluids, cell membranes, and cultured cells [33].…”