Cross-linked HPMC-co-Acrylic Acid Hydrogel as a High-Capacity Adsorbent for Basic Red 9 Removal: Equilibrium, Kinetics and Mechanistic Insights
DOI:
https://doi.org/10.64354/qptfkk37Abstract
This study investigated a cross-linked hydrogel composed of hydroxypropyl methylcellulose grafted with acrylic acid (HPMC-co-AA) for the removal of Basic Red 9 (BR9) dye from water. The hydrogel was made via free radical polymerization with potassium persulfate (KPS) as an initiator and N,N'-methylenebisacrylamide (MBA) as a nitrogen cross-linker FTIR, XRD, and FESEM characterized the substance. FTIR spectra showed acrylic acid grafting onto HPMC chains, whereas XRD patterns showed the hydrogel's semi-crystalline structure. FESEM micrographs displayed holes that absorbed dye. Batch adsorption tests looked at how pH, contact time, initial dye concentration, and adsorbent dose affected how well the dye was removed. Adsorption was highest at pH 8.0 and reached equilibrium in 90 minutes. A pseudo-second-order model well characterized the kinetic data, indicating that chemisorption was the predominant process. The best Langmuir isotherm model showed that monolayer adsorption has a capacity of 142.86 mg/g. The results indicate that the HPMC-co-AA hydrogel may effectively absorb dye-contaminated wastewater in a cost-efficient manner.
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