Environ Technol. 2013 Nov-Dec;34(21-24):3017-21. doi: 10.1080/09593330.2013.798035.
This manuscript describes the characterization of as-synthesized titanate nanotube (TNT) and its sorption behaviours on cadmium with the interactions of inorganic anions. The X-ray diffraction and transmission electron microscopy found that the nanotube is in sodium titanate crystal phase (Na2Ti3O7) and the pores of TNT are bimodally distributed with nominal pore sizes of 3 and 15 nm. In the binary systems between TNT and anions, the binding affinity is fluoride > phosphate > sulphate with sulphate being the least preferred. The order is similar to that of their first acidity constants, pKa1. In the presence of cadmium ions, slight decreases in fluoride and sulphate uptakes were observed. Phosphate uptake was, however, synergistically improved when cadmium was introduced. In the same ternary systems, it was found that these anions decreased the cadmium uptakes by TNT with the effect of sulphate being the most prominent.
本文描述了合成的钛酸盐纳米管（TNT）的特性及其与无机阴离子相互作用对镉的吸附行为。X 射线衍射和透射电子显微镜发现，纳米管处于钛酸钠晶体相（Na2Ti3O7），TNT 的孔隙呈双峰分布，名义孔径分别为 3nm 和 15nm。在 TNT 与阴离子的二元体系中，结合亲和力为氟化物>磷酸盐>硫酸盐，其中硫酸盐的亲和力最低。这一顺序与它们的第一酸度常数 pKa1 相似。在镉离子存在下，观察到氟化物和硫酸盐的吸附量略有下降。然而，当引入镉时，磷酸盐的吸附量协同得到了提高。在相同的三元体系中，发现这些阴离子通过 TNT 降低了镉的摄取量，其中硫酸盐的影响最为显著。
