二氧化钛纳米管阵列固载镁基吸附材料的研究

Magnesium based nano adsorbent (NMA) is an important adsorbent for heavy metal ions removal due to its advantages of abundant reserves, many active sites, strong adsorption capacity and low price. However, these NMA are easy to aggregate and difficult to separate during absorbing heavy metal ion in polluted water, which limited their application in the field of water treatment. To solve the above difficulties, based on our previous research, this project is carried out to investigate NMA loaded on titanium dioxide nanotube arrays (TNA). Firstly, TNA was prepared by anodic oxidation technique on the substrate surface of titanium mesh, and then the NMA was introduced into the TNA surface by electrochemical deposition technique to obtain a new type of Titanium mesh/TNA/NMA adsorption material. TNA’s porous channels can be used to disperse NMA, which can solve the problem of agglomeration of NMA. On the other hand, based on JKR adhesion theory, TNA and NMA will generate an excellent combination due to structural resonance between TNA and NMA, which will overcome the difficulty of NMA separation. Based on numerous experiments and theoretical analysis, the micro-mechanism of TNA immobilizing NMA will be brought to light, the absorbing mechanism of the obtained new type absorbent for removing heavy metal ion from polluted water will be revealed. The optimized absorbents with stabilizing structure and excellent absorbing capability are expected to be prepared, which not only will promote the application of NMA in waste water treatment, but also can enrich the mechanism system of absorbent materials.

镁基纳米吸附材料（NMA）由于具有储量丰富、活性位点多、吸附能力强、价格低廉等优势，是去除重金属离子的重要吸附材料。然而，这些NMA在工作过程中存在着易于团聚和难以分离的难题，从而影响其在水处理领域的推广应用。为了解决上述难题，本项目在前期研究的基础上，拟开展二氧化钛纳米管阵列（TNA）固载NMA的研究。首先利用阳极氧化技术在钛网等基体表面制备TNA，然后采用电化学沉积等技术将NMA引入TNA表面，以获得钛网/TNA/NMA新型吸附材料。TNA的多孔通道便于分散NMA，可以解决NMA的团聚问题；依据JKR黏附理论，TNA与NMA将因产生结构谐振而形成良好的结合，从而可以解决NMA难以分离的难题。基于大量实验研究和理论分析，揭示TNA稳固NMA的微观机制，解明新型吸附材料对重金属离子的吸附机制，优选出结构稳定、吸附性能优异的复合材料，推动NMA在水处理领域的应用进程，丰富吸附材料的理论体系。

镁基纳米吸附材料（NMA）由于具有储量丰富、活性位点多、吸附能力强、价格低廉等优势，是去除重金属离子的重要吸附材料。然而，这些NMA在工作过程中存在着易于团聚和难以分离的难题，从而影响其在水处理领域的推广应用。为了解决上述难题，本项目在前期研究的基础上，首先采用阳极氧化的方法在金属钛基体上制备了结构可控的二氧化钛纳米管阵列（TNA），发明了一种可以精确测定金属钛表面二氧化钛纳米管阵列的方法；以二氧化钛纳米管阵列为载体，采用脉冲电沉积以及循环伏安等技术NMA负载其表面获得了TNA/NMA复合结构的净水材料。TNA的多孔通道为NMA的形核提供了形核位点，故以二氧化钛纳米管阵列作为载体制备的NMA具有更小的晶粒尺寸。系统研究了TNA/NMA复合纳米结构的净水性能，该复合结构对Pb离子以及甲基橙等污染源具有良好去除效果。我们在研究中还发现，钛表面的二氧化钛纳米管阵列对金属表面的其他纳米功能材料也有良好的固载效能，如可以将金属钛表面固体润滑材料的稳定性提高200多倍。此外，这种二氧化钛纳米管阵列对进一步提高金属钛的生物相容性具有良好的效果。