Use of novel hydrogels based on modified cellulosics and methacrylamide for separation of metal ions from water systems

Abstract

ABSTRACT:Interpenetrating networks (IPNs) based on extracted cellulose and its derivatives such as hydroxypropyl cellulose (HPC), cyanoethylcellulose, hydroxyethylcellulose, hydrazinodeoxycellulose, cellulosephosphate with methacrylamide (MAAm), and N,N-methylene bisacrylamide were synthesized at reaction conditions evaluated for optimum network yield as a function of irradiation dose, concentrations of monomer and crosslinker, and amount of water. These networks were used in sorption of Fe 2ϩ , Cu 2ϩ , and Cr 6ϩ ions. The networks were further functionlized by means of partial hydrolysis with 0.5N NaOH and metal ion sorption studies were carried out. Appreciable amount of all the three ions was sorbed and partial functionalization of the hydrogels results in selectivity in ion sorption with enhanced affinity for Fe 2ϩ ions and total rejection of Cr 6ϩ ions. These results are of interest for the development of low-cost technologies based on smart hydrogels. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 667-671, 2002

Pectin and acrylamide based hydrogels for environment management technologies: Synthesis, characterization, and metal ions sorption

“…Partial hydrolysis should enhance metal ion uptake, as it increases polymer-metal ion and polymer-water interactions. 19 From Table IIIb it is understandable that most of the hydrolyzed samples do not absorb any Cr 61 ions while it is lower than the unhydrolyzed in case of Cu 21 . In hydrogels loaded with Cr 61 breakdown of the networks was observed due to oxidation of the pectin chains.…”

“…Sorption studies were carried as reported earlier. 19 Hydrogels were immersed for 24 h in 20.00 mL solutions of known strength. Filtrates of the solutions were analyzed for concentration of rejected ions on DR 2010 Spectrophotometer (M/s.…”

“…In our earlier communications, we have reported alternate polymeric materials based on biopolymers for use in environment management studies. [17][18][19][20][21] In the present article, we report modification of pectin by grafting and crosslinking reactions. Modification of pectin by grafting and crosslinking reactions with a series of closely related monomers, but at the same time offering a wide spectrum of properties like thermo sensitivity of N-isopropyl acrylamide (N-i-PAAm) and ion exchange and self-ionization of À ÀSO 3 H group of 2-acrylamido-2-methyl-1-propane sulfonic acid (AAmPSA) is expected to afford a wide range of useful hydrogels.…”

Polymers and its applications in agriculture

“…Dragan [69] described the studies of interpenetrating polymer networks (IPN) hydrogels based on biopolymeric materials, such as, chitosan, alginate, starch, and other polysaccharides. Chauhan and Mahajan [70] apud Dragan [69] described the use of IPN based on a combination of biopolymers with poly(methacrylamide) for metal ion sorption in aqueous solution. They noticed that the sorption capacity of the material drastically increased after inserting cellulose derivatives in the polymer network.…”

Synthesis of polyacrylate/polyethylene glycol interpenetrating network hydrogel and its sorption of heavy-metal ions

“…Conventional treatment techniques for removing dissolved heavy-metal ions from wastewater by chemical treatment, ultrafiltration or their combination do not always sufficiently remove contaminants to meet pollution control limits [1][2][3][4]. Recently, many types of hydrogel such as poly(acrylic acid), poly(acrylic acid) grafted cellulose and macroporous poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) have been reported for the removal of Cu(II), Cd(II) and Cr(III) under competitive conditions [5][6][7].…”