Abstract
Here, the cationic poly (3-acrylamidepropyl trimethyl ammonium chloride) [p (APTMACl)], anionic poly (2-acrylamido-2methylpropane sulfonic acid) [p (AMPS)], and amphoteric poly (APTMACl-co-AMPS) hydrogels were prepared via free-radical polymerization techniques as pH-sensitive hydrogels. The prepared systems were used in methylene blue (MB), and Eosin Y (EY) removal from aqueous media. HCl-treated p (APTMACl-co-AMPS) hydrogels prepared in 1:3 mol ratio adsorbed higher amount of MB and EY from their corresponding 50 ml 50 ppm aqueous solutions that are 47.5 ± 0.9, and 10.7 ± 0.1 mg/g, respectively. Also, the adsorbed amount of MB and EY by HCl-treated p (APTMACl-co-AMPS) hydrogels decreased with the increase in the medium pH from 3.0 to 9.0. It was also observed that HCl-treated p (APTMACl-co-AMPS)-3 hydrogels removed 39.2 ± 0.2, and 28.1 ± 1.0 mg/g MB and EY dyes simultaneously from their corresponding 50 ml 50 ppm aqueous mixture solutions. MB and EY adsorption by HCl-treated p (APTMACl-co-AMPS)-3 hydrogels were found to abide by pseudo-first-order adsorption kinetics. Moreover, MB adsorption by HCl-treated p (APTMACl-co-AMPS) hydrogels were found to fit with Freundlich, EY adsorption fit with Langmuir isotherms. The distribution coefficient values of HCl-treated p (APTMACl-co-AMPS) hydrogels were calculated as 3.7 ± 0.1 and 1.3 ± 0.1 for MB and EY, respectively. The calculated selectivity coefficient value showed that HCl-treated p (APTMACl-co-AMPS) hydrogels are at least 3-fold higher selective to MB than EY.
Highlights
Water is eventually contaminated with undesired contaminants that might be hazardous to living organisms, due to it is being the main solvent and is utilized in industrial, agricultural, or home activities (Anjaneyulu et al, 2005; Hai et al, 2007; Crini and Lichtfouse, 2019)
The preparation cationic p (APTMACl), anionic p (AMPS), and amphoteric p (APTMACl-co-AMPS) hydrogels were reported via free radical polymerization, and they were used in the removal of methylene blue (MB) and Eosin Y (EY) dyes from their corresponding aqueous solutions
The preparations of cationic, anionic, and amphoteric hydrogels were accomplished by simultaneous free-radical polymerization and crosslinking reaction
Summary
Water is eventually contaminated with undesired contaminants that might be hazardous to living organisms, due to it is being the main solvent and is utilized in industrial, agricultural, or home activities (Anjaneyulu et al, 2005; Hai et al, 2007; Crini and Lichtfouse, 2019). Hydrogels were prepared in various shapes and formulations (cylindric, film, etc.), ionic character (anionic, cationic, or amphoteric), and size (nano, micro, or macro) were successfully used in the removal of pollutants from aqueous media (Say et al, 2004; El-Hamshary et al, 2007; Yildiz et al, 2014; Sartape et al, 2017; Van Tran et al, 2018; Kubilay et al, 2021). A variety of pollutants of ionic nature be readily be removed from aqueous media can be handled by utilization of hydrogels as adsorbents (Sahiner, 2013). The preparation cationic p (APTMACl), anionic p (AMPS), and amphoteric p (APTMACl-co-AMPS) hydrogels were reported via free radical polymerization, and they were used in the removal of MB and EY dyes from their corresponding aqueous solutions. The effect of ionic nature, acid/base treatment of the adsorbents, the pH of dye solutions, and the effect of the dye concentrations on the removal of the related dyes from aqueous medium by the hydrogels were investigated. The simultaneous removals of both MB and EY from their corresponding mixture solutions were carried into amphoteric hydrogels and important parameters such as distribution and selectivity coefficients were determined
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