Synthesis of poly GMA/DVB and its application for the removal of Malachite Green from aqueous medium by adsorption process

摘要

In the present study, poly glycidyl methacrylate/divinyl benzene has been synthesized by the co-polymerization of glycidyl methacrylate and divinyl benzene monomers by thermal polymerization method and used as an adsorbent for the removal of malachite green (MG) dye from aqueous medium. This polymeric adsorbent is characterized by Scanning Electron microscopy, energy dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. The adsorption data has been applied to various isotherm models such as Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Flory-Huggins (F-H), and Temkin models. Different adsorption parameters such as time variation, effect of dye concentration, and pH effect is successfully evaluated. The maximum adsorption capacity is found to be 13.6mgg(-1) at 310K which is higher than some other adsorbents reported earlier. In order to study the adsorption mechanism, different kinetic models namely pseudo-first-order, pseudo-second-order and intra-particular diffusion model are applied and it is found that adsorption of MG on to polymer adsorbent follow pseudo-second-order kinetics. The change in Gibbs free energy (Delta G) was also calculated. The high removal capacity of present adsorbent indicate that it can be used as a promising and effective adsorbent for the removal of MG from aqueous medium.