Lu Wei, Li Le, Ding Dexin, Dai Zhongran, Tang Shuangyang, Cao Chen, Liu Ling, Chen D Tuo
School of Public Health, University of South China, Hengyang 421001, P. R. China.
Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, University of South China, Hengyang 421001, P. R. China.
J Nanosci Nanotechnol. 2018 Dec 1;18(12):8160-8168. doi: 10.1166/jnn.2018.16408.
Magnetic graphene oxide/calix[6]arene (MGO-C6) composites were prepared and then characterized by Fourier transform infrared spectroscopy, Scanning electron microscope, X-ray diffraction and Thermo gravimetric analyzer, the adsorption of U(VI) by MGO-C6 from aqueous solution was investigated as a function of pH, contact time, initial U(VI) concentration and adsorbent dosage. The maximum adsorption rate of MGO-C6 can reach up to 93.21%, which was highly efficient for the removal of U(VI) under the condition of 1 mg/L initial uranium concentration. In addition, the selective adsorption experiment showed that MGO-C6 had an overall preference for U(VI). Adsorption process of MGO-C6 fitted well with the pseudo-second-order kinetic kinetics and the Langmuir isotherm model. The thermodynamic parameters illustrated that the adsorption process was endothermic and spontaneous. This work demonstrated that MGO-C6 was a promising adsorbent for removal of U(VI) from low concentration uranium-containing wastewater.
制备了磁性氧化石墨烯/杯[6]芳烃（MGO-C6）复合材料，然后通过傅里叶变换红外光谱、扫描电子显微镜、X射线衍射和热重分析仪对其进行表征，研究了MGO-C6对水溶液中U(VI)的吸附与pH值、接触时间、初始U(VI)浓度和吸附剂用量的关系。MGO-C6的最大吸附率可达93.21%，在初始铀浓度为1 mg/L的条件下对U(VI)的去除效率很高。此外，选择性吸附实验表明MGO-C6对U(VI)具有总体偏好。MGO-C6的吸附过程符合准二级动力学和朗缪尔等温线模型。热力学参数表明吸附过程是吸热的且自发的。这项工作表明MGO-C6是一种从低浓度含铀废水中去除U(VI)的有前景的吸附剂。
