title: Reusable self-healing hydrogels realized via in situ polymerization.
abstract: In this work, a self-healing hydrogel has been prepared using in situ polymerization of acrylic acid and acrylamide in the presence of glycogen. The hydrogel was characterized using NMR, SEM, FT-IR, rheology, and dynamic light scattering (DLS) studies. The developed hydrogel exhibits self-healing properties at neutral pH, high swelling ability, high elasticity, and excellent mechanical strength. The hydrogel exhibits modulus values (G', G″) as high as 10(6) Pa and shows an exceptionally high degree of swelling ratio (∼3.5 × 10(3)). Further, the polymer based hydrogel adsorbs toxic metal ions (Cd(2+), Pb(2+), and Hg(2+)) and organic dyes (methylene blue and methyl orange) from contaminated water with remarkable efficiency (90-98%). The mechanistic analysis indicated the presence of pseudo-second-order reaction kinetics. The reusability of the hydrogel has been demonstrated by repeating the adsorption-desorption process over five cycles with identical results in the adsorption efficiency.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras (IIT M), Chennai 600 036, India.
authors.forename: Balachandran
authors.initials: B
authors.lastname: Vivek
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras (IIT M), Chennai 600 036, India.
authors.forename: Edamana
authors.initials: E
authors.lastname: Prasad
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D020100:Hydrogels / Q000737:chemistry*; D055595:Mechanical Phenomena; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification; D058105:Polymerization; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D004396:Coloring Agents; D020100:Hydrogels; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical