Preparation of mesoporous MnO₂/SBA-15 and its cesium ion adsorption properties

Mesoporous MnO₂/SBA-15 was prepared by a facile route using KMnO₄ and MnCl₂ as Mn source and used for removal of Cs⁺. The effects of MnO₂ content, initial Cs⁺ concentration, contact time and pH on the Cs⁺ adsorption behavior were investigated. It was found that Cs⁺ adsorption capacity of SBA-15 can be significantly improved by MnO₂ loading. The adsorption capacity increased with increasing MnO₂ content. Furthermore, the adsorption data can be well fitted by the Langmuir model, and the calculated maximum adsorption capacity of 80%MnO₂/SBA-15 is 104.8 mg/g. The Cs⁺ adsorption process can be better described by the pseudo-second-order model. (author)