Interaction between anionic dyes and cationic flocculant P(AM-DMC) in synthetic solutions

Synthesis and characterization of hydrophobically associating cationic polyacrylamide

“…As can be imagined, both cationic group and hydrophobic group were incorporated into the polymer molecule chain. The P(AM-DMDAAC-BA) is an amphiphilic cationic polyelectrolyte containing both hydrophobic groups (methyl groups, backbone chain and so on) and hydrophilic groups (positively charged tertiary amine and acrylamide groups) [8].Therefore, the electroneutralization effect, adsorption bridging effect and hydrophobic association effect could together contribute to oil removal during the treatment of oily wastewater.…”

New amphoteric flocculant containing beta-cyclodextrin, synthesis, charaterization and decolorization properties

“…It could be seen that the color removal increased first and then decreased with increasing dose of ␤-CD-MAH-TMAEMC. This was the typical curve of a flocculation system controlled by charge neutralization mechanism [7]. The anionic dye, bearing sulfonic groups (SO 3 − ), was electrostatically attracted by quaternary ammonium groups (N + (CH 3 ) 3 ) in ␤-CD-MAH-TMAEMC: this reaction allowed neutralizing the anionic charges of dyes that could bind together and settle.…”

“…Effect of the flocculant mass on the decolorization efficiency. induced a re-stabilization of the suspension and a decrease in the efficiency of the process [7]. It could be seen that an increase in temperature made against the improvement of color removal.…”

“…In It could be presumed that sulfonic groups in the dye molecules reacted with quaternary ammonium groups of flocculant and product like -N + (CH 3 ) 3 SO 3 − -in the aqueous solution formed [7], as schemed in Fig. 9.…”

“…Among them, flocculation is widely applied for the technological and especially economic reasons. It has been proved to be effective in removing dye compounds, in particular water-soluble dyes [3][4][5][6][7][8][9]. Otherwise, decolorization of the waste stream by this method is not due to a partial decomposition of dyes which produces some even more potentially harmful and toxic aromatic compounds and thus leads to a second pollution, but due to the removal of dye molecules from the dyebath effluents.…”