Li Dianxin, Yang Yiqing, Zhang Peng, Liu Jiangang, Li Tao, Yang Junwei
School of Mines and Civil Engineering, Liupanshui Normal University, 288 Minghu Road, 553004 Liupanshui, People's Republic of China.
R Soc Open Sci. 2021 Feb 24;8(2):202098. doi: 10.1098/rsos.202098.
The surface of was modified by coating sodium alginate. The modified before and after adsorption were characterized by SEM, FTIR and XPS. The effects of pH, reaction time, initial U(VI) concentration and adsorbent dosage on the adsorption of U(VI) by the modified were studied by batch adsorption experiments. The adsorption process was studied by pseudo-first-order kinetics and pseudo-second-order kinetic models, Langmuir and Freundlich isotherms. The results showed that the maximum adsorption capacity of U(VI) was 74.61 mg g under the conditions of pH 5.0, adsorbent 0.2 g l, 30°C and initial U(VI) concentration of 15 mg l. The adsorption process accords with pseudo-first-order kinetics and Langmuir isotherm. The adsorption capacity of U(VI) by the modified was still higher than 80% after five times of desorption and reuse experiments. In conclusion, the sodium alginate modified was an ideal material for U(VI) biosorption.
通过包覆海藻酸钠对[具体物质]的表面进行了改性。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对吸附前后的改性[具体物质]进行了表征。通过批量吸附实验研究了pH值、反应时间、初始U(VI)浓度和吸附剂用量对改性[具体物质]吸附U(VI)的影响。采用伪一级动力学和伪二级动力学模型、朗缪尔等温线和弗伦德利希等温线对吸附过程进行了研究。结果表明，在pH值为5.0、吸附剂用量为0.2 g/L、温度为30℃、初始U(VI)浓度为15 mg/L的条件下，U(VI)的最大吸附容量为74.61 mg/g。吸附过程符合伪一级动力学和朗缪尔等温线。经过五次解吸和再利用实验后，改性[具体物质]对U(VI)的吸附容量仍高于80%。综上所述，海藻酸钠改性[具体物质]是一种理想的U(VI)生物吸附材料。
