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Removal of methylene blue by modified polyacrylonitrile from aqueous solution

Gholamreza Kiani, Mostafa Khodagholizadeh, Mehdi Soltanzadeh

Chelating resins based on polyacrylonitrile (PAN) and monoethanolamine (MEA) were prepared with three volume percent of monoethanolamine. The resins (PAN-MEA) have been studied by FT-IR. The prepared resin (PAN-MEA I) were applied to remove of methylene blue from aqueous solution. The effects of adsorbent dose, initial pH, temperature, initial methylene blue concentration and contact time were investigated. Adsorption increased with increasing dye concentration, initial pH, and temperature. The maximum adsorption capacity of 158.954.3 mg g-1 of Methylene blue was achieved. Pseudo first-order, pseudo-second-order and intraparticle diffusion models were considered to evaluate the rate parameters. The adsorption followed pseudo-second-order kinetic model with correlation coefficients greater than 0.999. Experimental data were analyzed by model equations such as Langmuir, Freundlich and Temkin isotherms. It was found that Langmuir isotherm model was the best fitted with the adsorption data. Thermodynamic parameters of ÄG°, ÄH° and ÄS° indicated the adsorption process was spontaneous and endothermic.