A novel amidoxime functionalized adsorbent, poly(amidoxime)-grafted-chitosan/bentonite composite [P(AO)-g-CTS/BT] was prepared by in situ intercalative polymerization of acrylonitrile (AN) and 3-hexenedinitrile (3-HDN) onto chitosan/bentonite composite using ethylene glycol dimethacrylate (EGDMA) as cross linking agent and potassium peroxy disulphate (K₂S₂O₈) as free radical initiator. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), BET surface area analyser and X-ray photoelectron spectroscopy (XPS). Nitrile groups from two monomers converted to amidoxime groups and therefore, increases the adsorption efficiency of uranium(VI) [U(VI)] from seawater. The optimum pH for U(VI) adsorption was found to be 8.0. The adsorbent dosage of 2.0 g/L was sufficient for the complete removal of U(VI) from seawater. The kinetic data fitted well with pseudo-second-order kinetic model which assumes the presence of chemisorption. The equilibrium attained within 60 min and well agreement of equilibrium data with Langmuir adsorption model confirms monolayer coverage of U(VI) onto P(AO)-g-CTS/BT. The maximum adsorption capacity was found to be 49.09 mg/g. Spent adsorbent was effectively regenerated using 0.1 N HCl. Six cycles of adsorption-desorption experiments were conducted to study the practical applicability and repeated use of the adsorbent. The feasibility of the adsorbent was also tested using natural seawater. The results show that P(AO)-g-CTS/BT is a promising adsorbent for the removal of U(VI) from seawater.

通过丙烯腈（AN）和3-己烯腈（3-HDN）的原位插入聚合反应制备了一种新型的ox胺肟官能化吸附剂，聚（ami胺肟）接枝的壳聚糖/膨润土复合物[P（AO）-g-CTS / BT]。乙二醇二甲基丙烯酸酯（EGDMA）作为交联剂和过氧二硫酸钾（K ₂ S ₂ O ₈）作为自由基引发剂。通过傅里叶变换红外光谱（FTIR），X射线衍射（XRD），扫描电子显微镜（SEM），能量色散光谱（EDS），BET表面积分析仪和X射线光电子能谱（XPS）对吸附剂进行了表征。来自两个单体的腈基转化为a肟基，因此提高了铀（VI）[U（VI）]从海水中的吸附效率。发现U（VI）吸附的最佳pH为8.0。2.0 g / L的吸附剂量足以从海水中完全去除U（VI）。动力学数据与假二阶动力学模型吻合得很好，该模型假定存在化学吸附。在60分钟内达到平衡，并且平衡数据与Langmuir吸附模型完全吻合，证实了U（VI）在P（AO）-g-CTS / BT上的单层覆盖。发现最大吸附容量为49.09 mg / g。用0.1 N HCl可以有效地再生用过的吸附剂。进行六个吸附-解吸实验，以研究吸附剂的实际适用性和重复使用。还使用天然海水测试了吸附剂的可行性。结果表明，P（AO）-g-CTS / BT是从海水中去除U（VI）的有前途的吸附剂。还使用天然海水测试了吸附剂的可行性。结果表明，P（AO）-g-CTS / BT是从海水中去除U（VI）的有前途的吸附剂。还使用天然海水测试了吸附剂的可行性。结果表明，P（AO）-g-CTS / BT是从海水中去除U（VI）的有前途的吸附剂。