Abstract
The amidoxime -modified X-type zeolite (AO-XZ) was successfully prepared by using X-type zeolite (XZ) as a carrier, iminodiacetonitrile (IDAN) as a nitrile-based precursor, and loading the amidoxime group onto the XZ. Mesoporous structure of XZ was unchanged after modification and the mechanism of adsorption is ion exchange. The adsorption behavior followed the pseudo-secondary kinetics, indicating that chemical adsorption is dominant. The Langmuir model had a good fitting effect (R2 ≈ 0.9931), indicating that the adsorption process is dominated by single-layer uniform adsorption, and the maximum adsorption capacity of AO-XZ towards Cs+ by Langmuir fitting was 222.2 mg/g. The process of Cs+ adsorption by AO-XZ has high adsorption rate (greater than90%) under neutral conditions and common ion competition. Besides, in the dynamic experiment, the adsorption reached the point of failure after 14 h. The above results indicate that AO-XZ has good potential for removing Cs+ from radioactive wastewater in future practical applications.
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