Starch/PVA hydrogels for oil/water separation.

Area of Science:

• Materials Science
• Polymer Chemistry
• Biotechnology

Background:

• Polyvinyl alcohol (PVA) hydrogels are known for water absorption but suffer from brittleness.
• Enhancing hydrogel strength and water capacity is crucial for practical applications.

Purpose of the Study:

• To improve the mechanical strength and water-swelling capacity of PVA hydrogels.
• To investigate the effect of starch crosslinking and BMIM-BF4 blending on hydrogel properties.
• To explore the potential applications of the developed hydrogels in water absorption and biodegradability.

Main Methods:

• Glutaraldehyde-assisted crosslinking of starch with PVA.
• Blending with BMIM-BF4 to induce plasticity and porosity.
• Swelling capacity tests, water absorption from oil-water emulsions, and underwater oleophobicity measurements.
• Biodegradability assessment using an in-house biotic system.

Main Results:

• Hydrogel swelling capacity increased up to 300%.
• Achieved underwater oleophobic nature with an oil contact angle of ~153.6°.
• Demonstrated significant biodegradability (~90% in 28 days for 50% starch/PVA).

Conclusions:

• The developed starch/PVA hydrogels exhibit enhanced strength, superabsorbent properties, and biodegradability.
• These hydrogels are suitable for applications in arid land irrigation and superabsorbent hygiene products.
• The study provides insights into hydrogel structure-property relationships for water absorption and biodegradation.