Linde Type-A (LTA) zeolite was prepared from sodium aluminate and sodium metasilicate by hydrothermal process precursors. Sodium metasilicate prepared from molten NaOH and SiO₂. The zeolite was characterized by FTIR, XRD, XRF and SEM. The adsorption of Fe(III) from aqueous solution by zeolite A was studied. Different parameters like contact time, pH and concentration of iron were investigated. The results show that at contact time of 60 min and pH of 6 maximum adsorption of iron onto zeolite was observed. The kinetic data was analyzed using pseudo-first-order and pseudo-second-order kinetic models. The adsorption kinetics of Fe(III) were fitted well with the pseudo-second-order kinetic model.

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The extensive use of mobile phones has created the potential for promoting the culture and lifestyle of society. This study was conducted in Tehran; it examines the relationship between mobile phone use and civic culture. Considering the effect of multiple factors and complex relationships between variables, the study employs a systems approach to investigate the mutual relationship between mobile phone use and civic culture. Analysis utilized causal loop diagrams to depict relationships among variables, where 10 key factors were identified using the decision making trial and evaluation technique. These factors have exerted the greatest impact on civic culture; therefore, focusing on these factors during the urban policy-making process leads to the most effective policy that uses the least resources and budget. The ideal level of urban norms in the family was recognized as the most important influential and key factor followed by that at the community level of community acceptance in using the e-services of the city exerted the greatest impact on the issues. The outcomes could be used as a basis for policymaking in developing countries that intend to use mobile phones as a tool for promoting civic culture.

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