Why are polyacrylamide hydrogels used in wastewater treatment?

In recent years, polyacrylamide (PAAm) hydrogels became one of the most versatile adsorption materials in wastewater treatments for the removal of dye because of PAAm’s unusual chemical molecular structure. The amide (–CONH2) side groups in PAAm are active sites to remove soluble ions from water by coordination and chelation.

What is polyacrylamide hydrogel?

.acrylamides have alkyl or hydroxy alkyl groups (Ghanshyam et al., (2000).. Polyacrylamide hydrogel is an atoxic, stable, nonresorbable sterile watery gel consist ng of approximately 2.5% cross-linked polyacrylamide and nonpyrogenic water. Polyacrylamide hydrogel is widely used in ophthalmi o

How is polyacrylamide based hydrogel prepared by scanning electron microscopy?

ies of Polyacrylamide based hydrogel by Scanning Electron Microscopy (S.E.M).Tuncer et al., (2007) prepared macroporous poly (acrylamide) [poly (AAm)] hydrogels by using poly (ethylene glycol) (PEG) with three different molecular weight as

What is the adsorption value of PAAM/SA hydrogels?

As a result of swelling tests, PAAm/SA hydrogels swelled in the range of 12.72–25.52 gwater gdry gel−1 in water, while PAAm hydrogel swelled to 8.5 gwater gdry gel−1. Methylene blue adsorption, which showed a rapid increase with increasing pH in the range of pH 2.0 –6.0, reached the highest value at pH 7.0.

Does alginate based hydrogel swell more than polyacrylamide hydrogels?

As a result, the swelling contents of alginate-based hydrogels are higher than that of polyacrylamide hydro-gel (alginate concentration is zero). The variation of swelling with increasing content of sodium alginate showed the same tendency and the highest water absorption was achieved when the sodium alginate content was 1 g.

Are hydrogels water absorbent?

icultural fields.Keywords: Polyacrylamide, Water absorbent.1. INTR DUCTIONHydrogels are water-swellable, three-dimensional polymeric networks. The capacity of hydrogels to absorb water is enormous and can be as much as 1000 times the mass of polymer (Huglin and Zakaria (1986);