Removal of Manganese from Aqueous Solution by Natural Zeolite in the Presence of Iron, Chrome and Aluminum Ions

The main purpose of this study is removal efficiency of Clinoptilolite (zeolite) in absorption of manganese in the two modes of single and compound element in solution. The zeolite used in this study was provided from Semnan mines with particle size of 350 m. The results showed that the optimum pH of both single and compound modes was 5. The kinetics data were analyzed by Lagergrn, Ho et al and Avrami models in the both modes (single and compound). It was found that the data can be expressed satisfactorily by Avrami model. The determination coefficient for Avrami model in both single and compound modes were 0.998 and 0.999 respectively. Also the average absorption rate for manganese in two modes were 0.242 mg/g. min and 0.0146 mg/g. min respectively. Langmuir, Frondlich, Sip's and Radlich-Patterson models were also used in this study. The results showed that Sip's model with determination coefficient of 0.998 and 0.993 and error of 0.0248 and 0.0166 for both single and compound modes respectively, was more reliable for expressing the data than others. The Manganese absorption capacity for single and compound modes were 3.67 mg/g and 2.63 mg/g respectively. The surface area of Zeolite was measured using the methylene blue absorption method and was found 12.31m2/g.