Removal of methylene blue from aqueous solutions by poly(2-acrylamido-2-methylpropane sulfonic acid-co-itaconic acid) hydrogels

Abstract

In this study, removal of methylene blue (MB) from aqueous solution by poly(AMPS-co-IA) hydrogels was examined by batch equilibration technique. The effects of monomer ratio, concentration of initiator and crosslinker, pH, adsorption time, initial dye concentration and adsorption temperature on the removal of MB were studied. The results show that the removal of MB was highly effected by preparation conditions of hydrogel. The maximum removal was observed at 10/90 IA/AMPS monomer ratio, 1.0% KPS, and 10.0% MBAAm concentrations. Removal of MB was strongly affected by pH. Pseudo-first-order, pseudo-second-order and intraparticle diffusion models were applied. It was concluded that adsorption of MB on hydrogel followed pseudo-second-order kinetics. It was found that the adsorption isotherm of the MB fit Langmuir-type isotherms. From the Langmuir equation, the adsorption capacity was found as 1,000 mg/g for MB dye. Thermodynamic parameters suggest that the adsorption is a typical physical process, spontaneous, and exothermic in nature. Ten adsorption-desorption cycles demonstrated that the hydrogels were suitable for repeated use without considerable change in adsorption capacity. The results revealed that this hydrogels have potential to be used as an adsorbent for the removal of MB from aqueous solution.

Adsorption of textile dyes present in aqueous solution and wastewater using polyelectrolytes derived from chitosan

“…Polyelectrolytes are a type of polymer which can be used as adsorbent materials . Polyelectrolytes have proven a good alternative to remove textile dyes from wastewater . Polyelectrolytes are polymers containing ionic or ionizable groups joined by covalent bonds .…”

Magnetic nanoparticles embedded in pectin‐based hydrogel for the sustained release of diclofenac sodium

“…The bands at 1212 and 1028 cm −1 are attributed to asymmetric and symmetric stretching of O=S=O of -SO 3 H groups respectively. 35 The FTIR spectrum of Pec-g-PAMPS-2-MNC ( Fig. 2(c)) appears similar to the spectrum of Pec-g-PAMPS-2 with an additional band at 567 cm −1 which is attributed to Fe-O bond confirming the presence of Fe 3 O 4 inside the gel.…”

“…The band at 1612 cm −1 is assigned to stretching vibration of C=O present in carboxamide group and the band at 1726 cm −1 is attributed to C=O of the COOCH 3 group. The bands at 1212 and 1028 cm −1 are attributed to asymmetric and symmetric stretching of O=S=O of –SO 3 H groups respectively . The FTIR spectrum of Pec‐ g ‐PAMPS‐2‐MNC (Fig.…”

Functionalization of Enzymatically Synthesized Rigid Poly(itaconate)s via Post‐Polymerization Aza‐Michael Addition of Primary Amines

“…When both hydroxy groups of CHDM undergo acylation, the trans and cis configurations potentially lead to the formation of three isomers each. Two products have both OH groups esterified with either two C f (1,6) or with two C s (2, 7), the third one presents one C f and one C s as acyl groups. The trans configuration allows, in all cases, for the placing of both substituents in equatorial positions (5,6).…”

“…[3] Applications for this kind of polymers are widespread and range from dental materials, [4] elastomers, [5] drug-delivery and other biomedical and biotechnological applications. [6] Nevertheless, there has only been little work in the field of poly(itaconate)s because the chemical polycondensation of IA takes place at temperature above 150°C and leads to Ordelt saturation, cross-linking and isomerization of the C=C bond. [7] While the radical reactions were avoided using inhibitors such as MeHQ, BHT or quinol, [4,5] no effective solution has been identified so far to prevent the attack of the diol to the vinyl group via oxa-Michael addition (Ordelt saturation).…”