Adsorption of uranium(VI) from aqueous solution using a novel magnetic hydrothermal cross-linking chitosan

作者：Yu, Sheng-long; Dai, Ying; Cao, Xiao-hong; Zhang, Zhi-bin^*; Liu, Yun-hai^*; Ma, Hui-jie; Xiao, Sai-jin; Lai, Zhong-jun; Chen, Hai-jun; Zheng, Zhi-yang; Le, Zhang-gao

来源：Journal of Radioanalytical and Nuclear Chemistry, 2016, 310(2): 651-660.

DOI：10.1007/s10967-016-4898-y

• Magnetic hydrothermal cross-linking chitosan
• Adsorption
• Uranium(VI)

The magnetic hydrothermal cross-linking chitosan (HCC-Fe3O4) was prepared by hydrothermal carbonization and was characterized by FT-IR, X-ray diffraction and scanning electron microscopy. The as-prepared HCC-Fe3O4 was used as adsorbent to remove uranium(VI) as functions of contact time, pH, temperature and initial uranium(VI) concentration batch wise. The results indicated that the magnetic HCC-Fe3O4 was favorate for solid-liquid separation and the maximum uranium(VI) adsorption capacity was 263.1 mg/g at pH 7.0 and 25 A degrees C. The adsorption isotherm of uranium(VI) was well fitted by the Langmuir model. The adsorption is a chemical reaction in nature proved by the well described with pseudo-second-order model. The obtained thermodynamics parameters of positive Delta H, positive Delta S, and negative Delta G denoted the adsorption was an endothermic, disorder increasement, and spontaneous process. These results demonstrated that HCC-Fe3O4 was a promising adsorbent for the enrichment of uranium(VI) from aqueous solutions.

• 出版日期2016-11
• 单位东华理工大学