AI Article Synopsis
- Starch/poly(acrylic acid) hydrogels were synthesized using free radical polymerization with varying ratios of acrylic acid to N,N'-methylenebisacrylamide, resulting in an amorphous porous structure influenced by cross-linking.
- The hydrogels' swelling properties were affected by pH and cross-linking levels, with the optimal swelling occurring at a 94:6 ratio and pH 7.4 (201.90% swelling).
- Methylene blue adsorption was impacted by factors such as dye concentration and pH, with the 95:5 hydrogel showing the highest adsorption at pH 10.0, suggesting physisorption takes place on varied adsorbent surfaces.
Article Abstract
In this work, starch/poly(acylic acid) hydrogels were synthesized through a free radical polymerization technique. The molar ratios of acrylic acid to N,N'-methylenebisacrylamide were 95:5, 94:6, and 93:7. The samples exhibited an amorphous porous structure, indicating that the size of the pores was contingent upon the amount of cross-linking agent. The quantity of acrylic acid in structure rose with a little increase in the amount of the cross-linking agent, which improved the hydrogels' heat stability. The swelling characteristics of the hydrogels were influenced by both the pH level and the amount of cross-linking agent. The hydrogel with a ratio of 94:6 exhibited the highest degree of swelling (201.90%) at a pH of 7.4. The dominance of the Fickian effect in regulating water absorption in the synthesized hydrogels was demonstrated, and the kinetics of swelling exhibited agreement with Schott's pseudo-second order model. The absorption of methylene blue by the hydrogels that were developed was found to be influenced by various factors, including the concentration of the dye, the quantity of the cross-linking agent, the pH level, and the duration of exposure. The hydrogel 95:5 exhibited the highest adsorption effectiveness (66.7%) for the dye solution with a concentration of 20 mg/L at pH 10.0. The examination of the kinetics and isotherms of adsorption has provided evidence that the process of physisorption takes place on heterogeneous adsorbent surfaces and can be explained by an exothermic nature.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10366085 | PMC |
| http://dx.doi.org/10.1038/s41598-023-39241-z | DOI Listing |
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