| dc.description.abstract | The presence of synthetic dyes often used in textile manufacture can have serious
environmental and health consequences whenever introduced into aquatic habitats. To
mitigate these issues, adsorption has been extensively studied as an effective technique
for removing synthetic dyes from textile effluents. This research focuses on developing
an advanced methylene blue (MB) adsorbent composed of beads made from a
combination of chitosan (CS), polyethylene glycol (PEG), polyvinyl alcohol (PVA),
polyvinylpyrrolidone (PVP) as the outer layer and the inner core is superparamagnetic
iron oxide nanoparticles (SPIONs). In addition, the synthesized SPIONs had an average
size of 19.03 4.25 nm. The study aimed to quantify the MB adsorption and desorption
ability at pH 7.0 and 3.85, respectively. At an MB concentration of 9 mg/L, the loading
capacity and loading amount reached their maximum values after 120 hours, measuring
29.75 1.53 % and 297.48 15.34 mg/L, respectively. Additionally, the entrapment
efficiency of MB reached 29.42 2.19 % at an initial concentration of 8 mg/L,
demonstrating the adsorbent's effectiveness in dye removal. The study also measured
the cumulative desorption capacity of the adsorbent, which reached a maximum of 7.72
0.5 % after 13 days. The adsorption and desorption kinetics were analyzed using
pseudo-first-order, pseudo-second-order, and intraparticle diffusion models.
Additionally, the Elovich, Higuchi, and Korsmeyer-Peppas models were employed to
evaluate the experimental data. Various advanced techniques were used to characterize
the polymers such as FESEM, FTIR, XRD, VSM, and BET. The results showed that
SPION-coated CS/PEG/PVA/PVP beads have a significant capacity for methylene blue
adsorption, making them highly suitable for treating wastewater with elevated dye
concentrations. | en_US |
