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钌掺杂TiO2纳米粉体的制备及光催化性能研究朱晓玲1,王竹梅1,李月明1,左建林11. 景德镇陶瓷学院材料科学与工程学院摘 要:采用溶胶-凝胶法制备了Ru掺杂TiO2纳米粉体.采用X射线衍射(XRD),透射电子显微镜(TEM),X射线光电子能谱(XPS),紫外可见漫反射光谱(UV-Vis)等测试手段对其进行了表征,以亚甲基蓝为模拟污染物,评价了不同热处理条件下的粉体在可见光下的光催化活性.结果表明:Ru掺杂对TiO2纳米粉体的微观形貌没有明显影响,但抑制了TiO2锐钛矿相向金红石相的转变,也抑制了晶粒的长大;Ru掺杂能轻微促进TiO2表面活性基团TiOH的生成;Ru掺杂未改变TiO2的吸收边带,但可大大提高TiO2对可见光的吸收能力;Ru掺杂降低了TiO2纳米粉体的可见光催化性能.关键词......
and the appropriate amount of Ov and TiOx.Instead,the lowest ratios of TiOH and Ti-O-Fe(Ni) may be responsible for the optimum photocatalytic performance.关键词:......
to the phenol degradation because TiO2 is an amphoteric compound that will form TiOH of binary acid after hydration in aqueous solution. Different acid-base balances under different initial pH values are shown as follows [22]: pH<pHPZC: TiOH+H+TiOH2+ (1) pH>pHPZC: TiOH+OH- TiO-+H2O  ......
such as CaOH, TiOH, and COOH are known to be efficient inducers of apatite nucleation. In the oxidized films, CA was expected to undergo hydrolysis to form Ca2+, OH-, and TiO(OH)2 in the SBF. Hydroxylated titanium oxide is considered to be insoluble and yields a TiOH surface, which might act as a nucleation site. The hydrolysis of the Ca- and P-containing phases provides Ca2+, OH-, and HPO42......
成钛醇键,使其表面形成大量的羟基,这种钛醇键是二元酸,在不同的pH值下存在以下的酸碱平衡: >TiOH2+>TiOH+H+,; >TiOH>TiO-+ H+,. 即水化的TiO2 表面存在>TiOH2+,>TiOH 和>TiO-功能基.由于二元酸的解离方式及程度会受到溶液pH值的影响,因此,TiO2的表面特性由溶液的pH值所决定.而TiO2表面荷电及能带位置发生变化将产生很多活泼的不饱和悬键......
with oxygen in air, which results in the oxidization of +2 valence Ti and hydrolysis, forming the TiOH. At the later electrolysis stage, the main Ti valence is +1 and the content of TiOH is as high......
nucleation commenced with the transfer of the and Ca2+ from the SBF to the surface, where they bonded with the OH- group of TiOH4. (TiOH)4 compound was produced beforehand through the hydrolysis and destruction of the TiO2 passive film in accordance to Eq. (5) [55]: TiO2+2H2O=(TiOH)4 (5) The electrochemical assays demonstrated the formation of a stable passive film on the TiB/TiB2 coating, which later......
面Ti质点在水溶液中发生溶解和水化反应,生成各种羟基络合物.在水溶液中Ti4+的水解反应为 Ti4++OH-=(TiOH)3+,k1=7.08×10-15 (1) Ti4++2OH-=[Ti(OH)2]2+,k2=1.32×10-28  ......