A New Cationic Poly[1-vinyl-3-ethyl imidazolium iodide], P(VEII) Hydrogel for the Effective Removal of Chromium (VI) from Aqueous Solution

The removal of heavy metal ions from aqueous solutions by novel pH-sensitive hydrogels

“…Once they enter the food chain, large concentrations of heavy metal ions may accumulate in the human body. If the metal ions are ingested beyond the permitted concentration, they can cause serious health disorders [8]. Existence of heavy metal ion pollutants in water result in ecological problems even at very low concentration which increased the need for materials that can provide efficient complexing potential toward these metal ions [9].…”

Removal of heavy metal ions from aqueous solution by superabsorbent poly (NIPAAm/DAPB/AA) amphoteric nanohydrogel

“…(2015) [1][2][3][4][5][6][7][8][9][10][11][12][13][14] www.deswater.com doi: 10.1080/19443994.2015.1060171 amine, carboxylic acid, and sulfonic acid groups of hydrophilic polymers, which may be cross-linked by chemical or physical interactions. Such hydrophilic polymers, which can absorb, swell, and retain aqueous solutions up to hundred times to their own weight, are able to expand in volume with respect to changes in external parameters, such as pH, temperature, and ionic strength [11].…”

“…Entire removal study and characterization were performed on nanohydrogel V-03 as it has maximum percentage swelling. Removal study was carried out by taking specified amount (0.025 g) of adsorbent in 50 mL of metal ions solution at various initial concentrations (100-500 ppm), pH values (pH range [2][3][4][5][6][7][8][9][10][11][12][13][14], and adsorption doses (10-50 mg). After equilibrium, concentration of metal ions remaining in the solution was determined with a UV-visible spectrophotometer after 8 h. Maximum adsorption capacity and/or % removal efficiency (RE %) of nanohydrogels were calculated using the following Eqs.…”

“…Recently, adsorption is the most promising process due to its high efficiency, ease of operation, and costeffectiveness [6,7]. In this respect, researchers are interested to work with superabsorbent hydrogels as the selective adsorbent material for the removal of such heavy metal ions from wastewater [8][9][10].…”

Nickel and copper removal study from aqueous solution using new cationic poly[acrylamide/N,N‐DAMB/N,N‐DAPB] super absorbent hydrogel

“…The need for cost–effective, safe, and ability to carry out almost complete removal of heavy metal ions from wastewater has resulted in the development of new techniques such as polymeric adsorbents especially hydrogels. In recent years, many researchers along with our research group have worked on removal or retention of heavy metal ions using different hydrogels having different functional groups 4–11…”