School of Civil Engineering, Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China.
CGNPC Nuclear Power Operation Co., Ltd., Shenzhen, 518000, China.
Environ Sci Pollut Res Int. 2020 Jul;27(21):26835-26844. doi: 10.1007/s11356-020-09032-4. Epub 2020 May 7.
A novel three-dimensional aluminum sludge/polyvinyl alcohol/sodium alginate(AS/PA/SA) gel spheres were designed and prepared for uranium(VI) adsorption, and it overcomes the shortcomings of poor recycling of powdery aluminum sludge adsorbent and poor stability of sodium alginate. Experiments show that the P-S-AS has a good pH range for removal of uranium (4-5). Fitting experimental data with pseudo-first-order kinetic model and pseudo-second-order kinetic model shows that the adsorption of U(VI) by P-S-AS is a chemical action. The fit of the Langmuir isotherm model and Freundlich isotherm model to the experimental data found that the P-S-AS adsorbed U(VI) to a single layer. Thermodynamic analysis shows that the adsorption occurs spontaneously, and an increase in temperature is favorable for the adsorption of uranium by the P-S-AS. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis of the P-S-AS before and after adsorption showed that the main adsorption mechanism was the complexation reaction between functional groups and U(VI), the bonding reaction between metal oxides and U(VI).
设计并制备了一种新型的三维铝污泥/聚乙烯醇/海藻酸钠（AS/PA/SA）凝胶球，用于铀（VI）吸附，克服了粉状铝污泥吸附剂回收性差和海藻酸钠稳定性差的缺点。实验表明，P-S-AS 去除铀的良好 pH 范围为（4-5）。用拟一级动力学模型和拟二级动力学模型拟合实验数据表明，P-S-AS 对 U(VI)的吸附是一种化学作用。Langmuir 等温吸附模型和 Freundlich 等温吸附模型对实验数据的拟合表明，P-S-AS 以单层吸附 U(VI)。热力学分析表明，吸附是自发进行的，升高温度有利于 P-S-AS 对铀的吸附。吸附前后 P-S-AS 的傅里叶变换红外（FTIR）和 X 射线光电子能谱（XPS）分析表明，主要吸附机制是官能团与 U(VI)的络合反应、金属氧化物与 U(VI)的键合反应。
