Photoinitiated synthesis of poly(poly(ethylene glycol) methacrylate‐co‐diethyl amino ethyl methacrylate) superabsorbent hydrogels for dye adsorption

Abstract

Random copolymers of poly(ethylene glycol) methacrylate (PEGM), and diethyl amino ethyl methacrylate (DEAEM) were synthesized at low, and high conversions by photoinitiation. Crosslinked poly(PEGM‐co‐DEAEM) samples were obtained, and characterized by FTIR, SEM, DSC, TGA, and elemental analyses. Swelling behavior of the copolymers revealed that the copolymers acted as superabsorbent hydrogels. The monomer reactivity ratios were calculated using Fineman Ross, Extended Kelen Tüdøs, and Mayo Lewis methods that gave r1(PEGM) = 0.90, r2(DEAEM) = 0.14 at low conversions. At high conversions r1 and r2 values were calculated as 1.01 and 0.40, respectively. Adsorption isotherms of methyl orange (MO) onto hydrogels were studied using Langmuir, Freundlich, and Temkin models. The experimental data fitted well with the Langmuir equation. The maximum adsorption capacity for MO was 212.7 mg g−1 at pH = 3. The adsorption data gave best fit with the pseudo‐second order kinetic model. Thermodynamic evaluation showed spontaneous nature for MO adsorption onto poly(PEGM‐co‐DEAEM) hydrogels. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47707.

In Situ Synthesis of Magnetic Poly(DMAEAB-co-NIPAm)@Fe3O4 Composite Hydrogel for Removal of Dye from Water

“…One example is a β-cyclodextrin-based hydrogel to remove organic pollutants from water [ 17 ]. At present, progress has also been made in the preparation of stimulus-responsive hydrogels, such as the thermosensitive hydrogel, the pH-responsive hydrogel, the magnetic responsive hydrogel, and the electric field responsive hydrogels [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Thermoresponsive hydrogels are among the most widely studied stimuli-responsive hydrogels.…”

Cu(ii) and Zn(ii) frameworks constructed by directional tuning of diverse substituted groups on a triazine skeleton and supermassive adsorption behavior for iodine and dyes

“…According to the slope (k) and intercept (b) of the curves, the standard enthalpy change ΔH°(kJ mol −1 ) and the standard entropy change ΔS°(J mol −1 K −1 ) could be calculated, respectively. The standard Gibbs free energy change ΔG°( kJ mol −1 ) at different temperatures was calculated using the dependence of thermodynamic equilibrium constant (K c ) on temperature with eqn (4-4)-(4-6), [41][42][43] and the thermodynamic parameters are shown in Table 3. According to the enthalpy change ΔH°, the adsorption process of iodine in water by complex 1 was exothermic, and the adsorption capacity decreased with the increase of ambient temperature.…”

Effective removal of dyes from aqueous solutions using a novel antibacterial polymeric adsorbent

“…The experimental results were fitted with three different isotherm linear models (Temkin, Freundlich and Langmuir) which have been described in detail [27]. Also, the thermodynamic behaviour at different temperatures was examined considering the following equations [28]:…”

“…The positive ΔS o value of MO denotes an increase in the degree of randomness since heat is not transferred from the environment to the system (ΔH o is negative) which is isolated, therefore the entropy is considered as the main driving force for adsorption This value was expected since MO molecule is anionic (has a negative charge) and the dye solution is basic (pH = 8) with a negative charge, leading to a significant repulsion between the negative charges of the solution and the dye molecules which results in rising of ΔS o value (positive). Moreover, the values of ΔG o at all temperatures for both dyes are negative which revealed the spontaneity of the adsorption process [28,41].…”