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The removal of Cr (VI) from aqueous solution using two strong base anionic   resins with gel structure, Purolite A-400 (styrene-divinylbenzene matrix)   and Purolite A-850 (acrylic matrix) was investigated in batch technique. The   sorption efficiency was determined as a function of phases contact time,   solution pH, resin dose, temperature and initial Cr (VI) concentration. The   percentage of Cr (VI) removed reaches maximum values (up to 99 %) in the pH   range 4 - 5.3 under a resin dose of 6 g/L and of Cr (VI) concentration up to   100 mg/L. An increase in temperature has a positive effect on the Cr (VI)   sorption process. The equilibrium sorption data were fitted with the   Freundlich, Langmuir and Dubinin-Radushkevich isotherm models, using both   linear and nonlinear regression method. The Langmuir model very well   verifies the experimental data and gives the maximum sorption capacity of   120.55 mg Cr (VI)/g and 95.82 mg Cr (VI)/g for A-400 and A-850 resins,   respectively. The thermodynamic study and mean free energy of sorption   values calculated using Dubinin-Radushkevich equation indicated the sorption   is a chemical endothermic process. The kinetic data were well described by   pseudo-second order kinetic equation and the sorption process is controlled   by external (film) diffusion and intraparticle diffusion

Chromium (VI) removal from aqueous solutions by purolite base anion-exchange resins with gel structure