Removal of some textile dyes from aqueous solutions by poly(N-vinyl-2-pyrrolidone) and poly(N-vinyl-2-pyrrolidone)/K2S2O8 hydrogels

Synthesis and swelling properties of poly[acrylamide-co-(crotonic acid)] superabsorbents

“…The amount of solvent absorbed per unit area of polymer at time t, F t , as already represented in Eq. (8) in which k is a constant and n is a parameter related to the diffusion mechanism, the value of which lies between 0.5 and 1. Eq.…”

“…(c) Although it is not a strict requirement, absorbents should have some ionic character, since charge repulsion is an important factor in promoting polymer swelling in aqueous fluids [3]. Many kinds of SAPs have been commercialized since they are widely applied not only in the fields of personal care products, biosorbent, biomaterials [4], but also in soil for agriculture [5], wastewater treatment [6][7][8], etc., where water absorbency or water retention is important.…”

Highly efficient decomposition of Remazol Brilliant Blue R using tubular reactor coated with thin layer of PdO

“…In general, synthetic dyes are chemically stable and resistant due to the presence of a high amount of aromatic moities. The conventional methods for the removal of dyes in effluents include adsorption (Can et al, 2003;Jeon et al, 2008;Yamamoto et al, 2007), flocculation (Ciardelli and Ranieri, 2001), electrochemical methods (Szpyrkowicz et al, 2001;Vlyssides et al, 2000), membrane separation (Tan et al, 2006) and ozonation (Kusvuran et al, 2004;Matheswaran and Moon, 2009;Zhang et al, 2009). In addition, dye decomposition using homogeneous or heterogeneous catalysts along with hydrogen peroxide resulted in higher treatment efficiencies (Azbar et al, 2004;Melero et al, 2009;Taralunga et al, 2005;Yang et al, 2008).…”

Equilibrium and kinetic study on the adsorption of basic dye (BY28) onto raw Ca-bentonite

“…In consequence, a growing interest in the development of new technologies and procedures for the treatment of textile wastewater has emerged, including physicochemical and biological methods as well as the combinations thereof. Conventional methods of dyeing wastewater treatment include adsorption [5,6], flocculation [7], electrochemical methods [8][9][10], membrane separation [11], ozonation [7,12], advanced oxidation using UV/H 2 O 2 or UV/TiO 2 [13][14][15], and biological oxidation [16][17][18]. Some other advanced oxidation methods for dyeing wastewater treatment are wet air oxidation [19] and supercritical water oxidation [20,21], which are performed at sub and supercritical temperatures and pressures of water, respectively.…”