Ou Tao, Wu Yuhua, Han Weixing, Kong Lingjun, Song Gang, Chen Diyun, Su Minhua
Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China.
J Hazard Mater. 2022 Feb 15;424(Pt A):127208. doi: 10.1016/j.jhazmat.2021.127208. Epub 2021 Sep 12.
Halloysite nanotubes (HNTs) are considered structurally promising adsorption materials, but their application is limited due to their poor native adsorption properties. Improving the adsorption capacity of HNTs for radioactive U(VI) is of great significance. By controlling the mass ratio of HNTs and dopamine (DA), composite adsorbents (HNTs@PDA) with different polydopamine (PDA) layer thicknesses were synthesized. Characterization of HNTs@PDA demonstrated that the original structure of the HNTs was maintained. Adsorption experiments verified that the adsorption capacity of HNTs@PDA for U(VI) was significantly improved. The effects of solution pH, temperature, and coexisting ions on the adsorption process were investigated. The removal efficiency was observed to be 75% after five repeated uses. The adsorption mechanism of U(VI) by HNTs@PDA can be explained by considering electrostatic interactions and the complexation of C-O, -NH- and C-N/CN in the PDA layer. This study provides some basic information for the application of HNTs for U(VI) removal.
埃洛石纳米管（HNTs）被认为是结构上很有前景的吸附材料，但其天然吸附性能较差，限制了其应用。提高HNTs对放射性U(VI)的吸附能力具有重要意义。通过控制HNTs与多巴胺（DA）的质量比，合成了具有不同聚多巴胺（PDA）层厚度的复合吸附剂（HNTs@PDA）。对HNTs@PDA的表征表明，HNTs的原始结构得以保留。吸附实验证实，HNTs@PDA对U(VI)的吸附能力显著提高。研究了溶液pH值、温度和共存离子对吸附过程的影响。经过五次重复使用后，去除效率达到75%。HNTs@PDA对U(VI)的吸附机制可以通过考虑静电相互作用以及PDA层中C-O、-NH-和C-N/CN的络合作用来解释。本研究为HNTs用于去除U(VI)提供了一些基础信息。
