Environmental Applications of Biobased Polydopamine-β-Cyclodextrin-Epichlorohydrin Supramolecular Hydrogel with Tuneable Swelling and Selective Adsorption Behaviors
Source abstract
Abstract
Supramolecular hydrogels have been extensively studied for environmental applications owing to their biocompatible, nontoxic, and cost-effective properties. Herein, a polydopamine-β-cyclodextrin-epichlorohydrin (PDA-β-CD-EP) supramolecular hydrogel was facilely prepared through one-pot polymerization using a molar ratio of dopamine (DA)/β-cyclodextrin (β-CD)/epichlorohydrin (EP) of 1/2/50. Compared with other hydrogels, the (PDA-β-CD-EP) supramolecular hydrogel can selectively adsorb malachite green from mixed dyes. The structure, surface morphology, and thermostability of the PDA-β-CD-EP supramolecular hydrogels were illustrated by FT-IR, SEM–EDX, and TGA-DTG, respectively. Interestingly, the PDA-β-CD-EP-2 supramolecular hydrogel exhibited excellent pH-responsive swelling behavior. The influences of the pH, adsorption time, dosage, and initial concentration were systematically studied. Under optimal conditions, the maximum adsorption capacity of the PDA-β-CD-EP-2 supramolecular hydrogel was 652.1 mg/g for MG according to the Langmuir fitting results, much higher than those of the other adsorbents. More importantly, the PDA-β-CD-EP-2 supramolecular hydrogel possessed good reproducibility, reusability, and biodegradability. Besides, the selective adsorption mechanism was proposed and proved, such as hole size and shape effect, electrostatic force, and host–guest interaction. Overall, this study could provide a method to prepare a PDA-β-CD-EP-2 supramolecular hydrogel as a biosorbent for wastewater remediation.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Hydrogels: synthesis, properties, applications · Supramolecular Self-Assembly in Materials · Polymer Surface Interaction Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Chongqing Key Laboratory of Water Environmental Evolution and Pollution Control in Three Gorges Reservoir, School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404100, PR China
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China
Funding
Chongqing Municipal Education Commission · Natural Science Foundation of Chongqing Municipality
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