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Title

METHYL VIOLET DYE ABSORPTION FROM AQUEOUS SOLUTIONS BY NANOMAGNETIC HYDROGELS BASED ON K-CARRAGEENAN AND ACRYLIC ACID

Pages

 Start Page 365 | End Page 376

Abstract

 N anomagnetic HYDROGELs, based on κ-carrageenan and acrylic acid, were prepared for removal of METHYL VIOLET from aqueous solutions. K-CARRAGEENAN/ acrylic acid-based HYDROGELs were prepared in aqueous solution in thepresence of methylene bisacrylamide (MBA) and ammonium persulfate (APS), the former as a crosslinking agent and the latter as an initiator. The NANOMAGNETIChydrogels were obtained by co-precipitation of Fe (II) and Fe (III) ions in presence ofammonia solution. The effects of different variables such as contact time, temperature, amount of adsorbent, and pH were examined in relation to the sorption behavior of themethyl violet. The structure of the NANOMAGNETIC HYDROGELs were studied by infraredspectroscopy (IR), thermogravimetric analysis (TGA), scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The results of scanningelectron microscopy and transmission electron microscopy showed that the magneticnanoparticles in the HYDROGEL matrix were dispersed satisfactorily with approximatesize of 5-15 nm. The maximum amount of adsorption reached approximately 86%under optimum conditions of 60 min, pH 8 and initial dye concentration of 10 ppm.The adsorption capacity increased with temperature and pH. This study showed thatthe obtained NANOMAGNETIC HYDROGELs with high removal efficiency and low reactiontime could be used as effective adsorbents of METHYL VIOLET dyes from aqueoussolution and for simple separation by a magnetic field. The equilibrium process ofremoving metal ions by NANOMAGNETIC HYDROGELs could be evaluated efficiently usingthe Langmuir, Freundlich and Temkin models.

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