manganese removal from aqueous solution by natural and sodium-modified zeolite

the purpose of this study is comparison of manganese absorption capacity by natural and modified zeolite. for this purpose used by from semnan mines zeolite with mean particle diameter of 360 micrometer. for modified zeolite, 5 g amount of natural zeolite with 100 ml of 1 m sodium chloride solution mixed and maintained at 24 hours in room temperature. for measure specific surface of absorbents, used by methylene blue absorption method, and results showed the specific surface of natural and modified zeolite is 12.13 and 13.453 m2/g respectively. the analysis of adsorption kinetics showed that non-equilibrium models avrami, ho et al and lagergern described good adsorption processes. but avrami's model has lowest error factor (0.016 for natural zeolite and 0.007 for modified zeolite) and the highest correlation coefficient (99.9%). isotherm adsorption study showed that sip's and longmuir models correlation coefficients are 99.8% with 0.075 and 0.074 error factors respectively that better described data for natural zeolite sorbent. also, for the modified zeolite, sip's model correlation coefficient (99.7%) and with lowest error factor (0.097) is data better described the experimental data. manganese adsorption capacity for natural and modified zeolite is 3.67 and 5.316 mg/g respectively. the results showed that the zeolite semnan (iran) to various absorbents such as zeolite turkey and chile in a better capacity to remove manganese from the environment is blue. also, the removal efficiency of manganese by sodium zeolite has been greater than normal.