Novel Nanoporous Superabsorbent Hydrogel Based on Poly(acrylic acid) Grafted onto Salep: Synthesis and Swelling Behavior

Abstract

Hydrogels of poly(acrylic acid) grafted onto salep with excellent water absorption and water retention abilities under neutral conditions were successfully synthesized for the first time and employed for different applications. The effect of reaction variables to achieve maximum swelling capacity was investigated. In our procedure, ammonium persulfate (APS) as a water‐soluble initiator and methylenebisacrylamide (MBA) as a suitable crosslinking agent were used and the best synthesis conditions described. The structure of the final product was confirmed by Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscopy SEM and TGA analysis and a mechanism for superabsorbent hydrogel formation was also suggested. The study of the surface morphology of hydrogels using SEM showed a highly nanoporous and cellular structure for the sample obtained under optimized condition. Furthermore, several factors which influence the water uptake of hydrogels, such as pH of water, sensitivity to salt solutions and solvent mixtures were examined.

Salep‐g‐poly(sodium acrylate)/alumina as an environmental‐sensitive biopolymer superabsorbent composite: Synthesis and investigation of its swelling behavior

“…17,18 Recently, we have developed highly swelling nanoporous hydrogel based on salep as a new superabsorbent hydrogel backbone. 17 Then, we utilized these nanoporous materials as a nanoreactor for synthesis of Hematite nanoparticles.…”

Preparation and Investigation on Swelling and Drug Delivery Properties of a Novel Silver/Salep-g-Poly(Acrylic Acid) Nanocomposite Hydrogel

“…For preparation of silver/salep-g-PAA HNs, sunlight-UV as a gratis source of reducing agent, and salep as a biocompatible, biodegradable, non-toxic, effective capping agent, and multifunctional material was utilized to inhibit the agglomeration of the freshly prepared silver nanoparticles in solution. [17][18][19] In this approach, the coordinated silver cations were reduced into the silver nanoparticles by photochemical reactions. The schematic representation of this conversion was indicated in Scheme 1.…”

Novel salep-based chelating hydrogel for heavy metal removal from aqueous solutions

“…[21] Salep-based hydrogels, for the first time, were developed in 2008 by our research group. [22][23][24][25] Salep [26,27] is a multicomponent polysaccharide obtained from dried tubers of certain natural terrestrial orchids and can be referred as a good source of glucomannan (16-60%). In the present work, optimized synthesis of salep-g-poly(AAm-co-HEMA) as a novel biopolymer-based metal chelating hydrogel was carried out with a systematic method, and its application for removing Cu (II), Pb (II), Cd (II), and Cr (III) ions from aqueous solution was investigated.…”