Adsorption of uranium(VI) from aqueous solution using a novel magnetic hydrothermal cross-linking chitosan
Adsorption of uranium(VI) from aqueous solution using a novel magnetic hydrothermal cross-linking chitosan
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DOI：
10.1007/s10967-016-4898-y
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发表时间：
2016-06
影响因子：
1.6
通讯作者：
Sheng-long Yu;Ying Dai;Xiaohong Cao;Zhi-Bin Zhang;Yunhai Liu;Huiqiang Ma;S. Xiao;Zhong-jun Lai;Haijun Chen;Zhi-yang Zheng;Z. Le
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文献类型：
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作者：
Sheng-long Yu;Ying Dai;Xiaohong Cao;Zhi-Bin Zhang;Yunhai Liu;Huiqiang Ma;S. Xiao;Zhong-jun Lai;Haijun Chen;Zhi-yang Zheng;Z. Le
采用水热碳化法制备了磁性水热交联壳聚糖（HCC-Fe 3 O 4），并通过红外光谱、X射线衍射和扫描电镜对其进行了表征。以HCC-Fe_3 O_4为吸附剂，考察了吸附时间、pH值、温度和铀（VI）初始浓度对吸附效果的影响。结果表明，磁性HCC-Fe 3 O 4具有良好的固液分离性能，在pH 7.0、温度25 °C时，其对铀（VI）的最大吸附量为263.1 mg/g。吸附等温线符合Langmuir模型。吸附过程本质上是一个化学反应，可用准二级动力学模型描述。热力学参数为正ΔH、正ΔS和负Δ G，表明吸附是一个吸热、无序增加、自发的过程。结果表明，HCC-Fe_3 O_4是一种很有前途的水溶液中铀（VI）富集吸附剂。
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–Fe3O4was 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–Fe3O4was favorate for solid–liquid separation and the maximum uranium(VI) adsorption capacity was 263.1 mg/g at pH 7.0 and 25 °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 ΔH, positive ΔS, and negative ΔGdenoted the adsorption was an endothermic, disorder increasement, and spontaneous process. These results demonstrated that HCC–Fe3O4was a promising adsorbent for the enrichment of uranium(VI) from aqueous solutions.