Efficient trapping of cesium ions in water by titanate nanosheets: experimental and theoretical studies

Abstract

In recent years, TNS has attracted wide attention because of its simplicity in synthesis and high efficiency in ion exchange. The adsorption of cesium ions in aqueous solution by TNS was investigated in this study. Results show that the removal rate of Cs (I) is about 88% when pH = 5.00 ± 0.05, C0 = 10 ppm and CTNS = 0.1 g/L. The adsorption equilibrium is reached in about 20 minutes and best fits the pseudo-second order model, R2 = 0.9998; compared with the Freundlich isotherm adsorption model and Temkin model, the Langmuir model has the best fitting effect, R2 = 0.9903. The fitting results show the maximum adsorption capacity of TNS for Cs (I) is 200.00 mg/g. The main adsorption mechanism of TNS to cesium ion is ion exchange. Therefore, TNS can be used as a potential adsorbent for effectively adsorbing Cs-containing wastewater. HIGHLIGHTS The removal of Cs (I) from aqueous solutions by TNS was firstly studied.; TNS showed a high adsorption capacity for Cs (I).; The solution pH played a significant role in the adsorption process of Cs (I).; TNS exhibited an excellent selectivity for Cs (I) in the interference of common cations.; The adsorption mechanism was the ion exchange between the interlayer Na (I) of TNS and Cs (I).;

Keywords

• adsorption
• cesium
• mechanism of action
• titanate nanosheet