N-morpholino Ethyl Methacrylate Research Articles

Adsorption Mechanism of Xanthan Gum Based Hydrogel Adsorbent for the Removal of Cationic Methylene Blue from Aqueous Solutions

In this study a poly(2-(N-morpholinoethyl methacrylate) (Xg-PMEMA) hydrogel grafted with xanthan gum was prepared and used as a potential adsorbent to remove dyes from wastewater. Methylene blue (MB), a cationic dye, was chosen as a model to mimic dye-contaminated water because it is widely used in the textile industry. The micro-porous adsorbent was characterized by FT-IR, FESEM, and zero point of charge (pHzpc) analyses. Adsorption parameters, such as solution pH, adsorbent dosage, contact time, and initial dye concentration, that affect the removal of MB from aqueous solutions were studied. The pH of the solution was found to have a significant effect on adsorption, with maximum removal occurring at a pH of 11.0. The pHzpc of the hydrogel adsorbent Xg-PMEMA was determined to be 7.8. The adsorption process followed the Freundlich isotherm model and the pseudo-second-order kinetic model, suggesting that the multilayer adsorption of MB occurred by a chemisorption mechanism on the heterogeneous surfaces of Xg-PMEMA. In addition, Xg-PMEMA exhibited good reusability after four successive adsorption/desorption cycles, indicating that the material could be used as an effective adsorbent for the removal of cationic dyes from wastewater.

Semi-interpenetrating network based on xanthan gum-cl-2-(N-morpholinoethyl methacrylate)/titanium oxide for the single and binary removal of cationic dyes from water

In the present study, semi-interpenetrating polymer networks (semi-IPNs) were synthesized based on xanthan gum (XG)-cl-2-(N-morpholinoethyl methacrylate) (MEMA)/titanium dioxide (TiO2) in the presence of N, N` methylene bisacrylamide (MBAAm), as the cross-linking agent. After that, the semi-IPN hydrogel was used to adsorb Methylene Blue (MB+) and Crystal Violet (CV+) from single and two-component adsorption systems. The optimal pH for efficient dye adsorption in aqueous solutions has been determined to be 8 for CV+ and 11 for MB+, respectively. The presence of polar oxygen-containing functional groups such as OH, CO, C-O-C, COOH, and others has been noticed to be the primary driving force in dye adsorption.Equilibrium data from a single process fitted very well to the Freundlich and Dubinin–Radushkevich models (R2 = 0.997 and 0.99) for MB+ and CV+, respectively. In a binary system, CV+ removed more than MB+, and both dyes demonstrated synergism during the adsorption of CV+/MB+ solutions. The dye removal efficiency of the adsorbent was found to be quite good even after the fourth adsorption-desorption cycle. In the treatment of multi-component contaminated water, XG-cl-poly (MEMA)/TiO2 might be a beneficial and reusable adsorbent.

Specific Features of N-Morpholinoethyl Methacrylate Synthesis

Methods for synthesis of N-morpholinoethyl methacrylate were compared. It was shown that the monomer produced by acylation of N-morpholinoethanol with methacrylic acid anhydride or methacryloyl chloride spontaneously polymerizes in storage. The possible reasons for the spontaneous polymerization of N-morpholinoethyl methacrylate produced by the acylation method were considered. The conditions in which a stable-in-storage monomer can be obtained in 86–88% yield by the method of re-esterification of methyl methacrylate with N-morpholinoethanol were determined.