Removal of cationic dyes by poly(AA-co-AMPS)/montmorillonite nanocomposite hydrogel

Abstract

In this work, adsorption feasibility of a cationic dye, methylene blue (MB), onto an anionic hydrogel nanocomposite was investigated in detail. Firstly, the hydrogel nanocomposite was synthesized via a simple solution copolymerization of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid monomers in the presence of montmorillonite (MMT) by using ammonium persulfate as an initiator and methylene bisacrylamide as a crosslinker. Then, the effects of agitation time, MMT content, pH, initial dye concentration, adsorbent dose, and temperature were optimized with respect to the dye adsorption capacity of nanocomposites. The thermodynamic parameters such as changes in standard free energy, enthalpy, and entropy demonstrated that dye adsorption onto the hydrogel nanocomposite was spontaneous and endothermic, and especially more effective at high temperatures. Moreover, the results indicated that the equilibrium adsorption isotherm data of the hydrogel nanocomposite better fit to the Redlich-Peterson than to the Langmuir, Freundlich, and Temkin models. The experimental results also fit to pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models. The results indicated that the adsorption of MB followed pseudo-second-order kinetics.

In situ preparation of magnetite/cuprous oxide/poly(AMPS/NIPAm) for removal of methylene blue from waste water

“…This can be attributed to the presence of more effective adsorption sites with lower particle sizes of AMPS/NIPAm/Fe 3 O 4 and AMPS/NIPAm/Fe 3 O 4 .Cu 2 O.Fe 3 O 4 nanocomposites (Figs and ). Moreover, the increasing dispersion of Fe 3 O 4 and Fe 3 O 4 .Cu 2 O.Fe 3 O 4 into the AMPS/NIPAm networks also enhances their ability to adsorb MB from aqueous solutions …”

Clay-Polymer Nanocomposites: Preparations and Utilization for Pollutants Removal

“…may cause environmental problems even at trace amounts. Interestingly, these organic contaminants were removed using CPNs as adsorbent, due to the existence of polymeric hydrophobic parts on the NCs surfaces [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 ]. In this perspective, several CPNs in the form of powder or tablets were prepared using the thin-coated layer methods.…”

“…For example, chitosan-g-poly (acrylic acid)/ montmorillonite showed an adsorption capacity of 1895.0 mg/g for methylene blue [ 72 ]. However, for poly(acrylic acid-co-2-acrylamido-2- methylpropanesulfonic acid)/montmorillonite, the adsorption capacity was only 215.0 mg/g for the same dye [ 85 ]. Result variability was also observed for other pollutants (heavy metals, bacteria, etc.).…”

Synthesis and characterization of (AAm-co-AHPS)/MMT hydrogel composites for the efficient capture of methylene blue from aqueous solution

“…This organo-modification enables montmorillonite layers to be intercalated and/or exfoliated within the polymer matrices [21]. The clay minerals have been used in designing hydrogel composites as adsorbents for removing dyes from the aqueous solutions [5,6,[22][23][24][25][26].According to the literature survey that we made, a study of the adsorption of the MB dye using the AAm-co-AHPS modified with organo-montmorillonite hydrogel composite was not reported, so the aim of the present study is to develop a new hydrogel composite combining between the swelling and adsorption properties of organo-montmorillonite and the ionic monomer, AHPS. The hydrogel system will provide ionic groups that contribute to the good dispersion and suspension of the montmorillonite in the adsorption solution, and also provide ionic sites that can adsorb the cationic dyes.…”