Abstract
The unique selective adsorption of hydrophilic dyes gives the hybrid hydrogels of hyperbranched poly(ether amine) (SiO1.5-hPEA-Gels) potential in the separation. We here introduced poly(vinyl alcohol) (PVA) to enhance the mechanical strength of hybrid hydrogels to extend them into the practical application. A series of PVA-enhanced hybrid hydrogels (PVA@SiO1.5-hPEA-Gels) were prepared by chemically cross-linking between hydroxyl groups of PVA and trimethoxysilyl groups of hyperbranched poly(ether amine) (TMS-hPEA) in water. The compress stress of PVA@SiO1.5-hPEA-Gels increased significantly with the increasing content of PVA. Compared to hybrid hydrogel without PVA, the stress of PVA@SiO1.5-hPEA-1/2-Gel containing 33% PVA increased hundreds of times. The adsorption behavior of the obtained PVA-enhanced hydrogels to ten hydrophilic dyes was investigated in detail. Regardless of their charge states, PVA@SiO1.5-hPEA-Gels exhibited the quick adsorption to Ponceau S (PS), Rose Bengal (RB), Orange G (OG), and P...
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