Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE A multi-step grafting cross-linking strategy was adopted to construct the framework with AA and integrate MWCNT enhancement. EDC/NHS coupling was used to graft CTS onto CD to prepare organic dye adsorption with synergistic adsorption PACCK@MWCNT, achieving structural customization and enhancement, and precisely meeting the wastewater treatment requirements.

ABSTRACT
In response to the prominent problems of severe pollution and high difficulty in degradation of dye wastewater. AA monomers were used to construct a high-molecular-weight backbone. Chloroacetic acid was employed for etherification modification of cyclodextrin, introducing abundant -COOH groups onto its molecular skeleton. Further, MWCNT was incorporated as a reinforcing phase into the hydrogel system. The active sites on MWCNT surface form a synergistic adsorption effect with cyclodextrin cavities, significantly broadening the adsorption scope for organic dyes. The structure and morphology of the hydrogels were characterized by infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and x-ray diffractometer (XRD). Different adsorbent dosage, temperature, pH and time were studied. Adsorption properties of Rhodamine B (RhB) dye. The results show that the surface of this cyclodextrin-based porous hydrogel has a well-developed porous network structure. Compared with traditional adsorption materials (such as activated carbon, single cyclodextrin materials and ordinary hydrogels), it has the advantages of larger specific surface area, more abundant active functional groups and higher mass transfer efficiency, and the maximum adsorption capacity of RhB can reach 858.6113 mg/g under optimal conditions. The adsorption process accords with the quasi-second-order kinetic model and Langmuir isothermal model, and belongs to the spontaneous, entropy-increasing and endothermic process. Therefore, the prepared hydrogel adsorbent material possesses the advantages of easy regeneration and efficient reusability, and exhibits great application potential in the purification of RhB from asphalt pavement sewage.