本文利用纳米TiO2粉体,以聚乙烯吡咯烷（PVP）为分散剂和结构引导剂,以正硅酸乙酯（TEOS）为纳米SiO2前驱体,在纳米TiO2粉体表面包覆纳米SiO2,制备纳米TiO2-SiO2复合粒子。将纳米TiO2-SiO2复合粒子整理到棉织物上,并通过十六烷基三甲氧...本文利用纳米TiO2粉体,以聚乙烯吡咯烷（PVP）为分散剂和结构引导剂,以正硅酸乙酯（TEOS）为纳米SiO2前驱体,在纳米TiO2粉体表面包覆纳米SiO2,制备纳米TiO2-SiO2复合粒子。将纳米TiO2-SiO2复合粒子整理到棉织物上,并通过十六烷基三甲氧基硅烷（HDTMS）低表面能修饰后,得到抗紫外和超疏水复合功能棉织物。探究制备纳米TiO2-SiO2复合粒子的最佳工艺,并对复合粒子和处理后棉织物进行表征。结果表明,当PVP用量为0.025%,硅钛比例为2∶1,氨水用量为5 m L时,纳米SiO2包覆TiO2效果较好。处理棉织物的抗紫外指数（UPF）达115.42,紫外线UVA（320420 nm）透过率为3.35%,接触角为156.54°,滚动角为8°,具有优异的抗紫外、超疏水性能。此外,处理棉织物经过24 h紫外线照射后,接触角仍为152.73°,滚动角仍可达到9°,实现了耐紫外线稳定性。展开更多
The transition metal ion doped TiO 2 nanoparticles were prepared with hydrothermal method, and the effects of doping different metal ions on the ability of TiO 2 in photocatalyzing degradation of rhodamine B(RB) were ...The transition metal ion doped TiO 2 nanoparticles were prepared with hydrothermal method, and the effects of doping different metal ions on the ability of TiO 2 in photocatalyzing degradation of rhodamine B(RB) were studied. The results showed that the doping of Fe 3+ , Co 2+ , Ni 2+ and Cr 3+ in TiO 2 nanoparticles made the photocatalytic efficiency of the TiO 2 particles reduce and the higher the initial content of Fe 3+ , the lower the ability of TiO 2 in photocatalyzing the degradation of RB. But the doping of Zn 2+ and Cd 2+ , especially Zn 2+ , made the photocatalytic efficiency of the TiO 2 particles enhance, showing a great increase of the rate constant( k ) and the initial reaction rate( r ini ).展开更多
文摘本文利用纳米TiO2粉体,以聚乙烯吡咯烷（PVP）为分散剂和结构引导剂,以正硅酸乙酯（TEOS）为纳米SiO2前驱体,在纳米TiO2粉体表面包覆纳米SiO2,制备纳米TiO2-SiO2复合粒子。将纳米TiO2-SiO2复合粒子整理到棉织物上,并通过十六烷基三甲氧基硅烷（HDTMS）低表面能修饰后,得到抗紫外和超疏水复合功能棉织物。探究制备纳米TiO2-SiO2复合粒子的最佳工艺,并对复合粒子和处理后棉织物进行表征。结果表明,当PVP用量为0.025%,硅钛比例为2∶1,氨水用量为5 m L时,纳米SiO2包覆TiO2效果较好。处理棉织物的抗紫外指数（UPF）达115.42,紫外线UVA（320420 nm）透过率为3.35%,接触角为156.54°,滚动角为8°,具有优异的抗紫外、超疏水性能。此外,处理棉织物经过24 h紫外线照射后,接触角仍为152.73°,滚动角仍可达到9°,实现了耐紫外线稳定性。
文摘The transition metal ion doped TiO 2 nanoparticles were prepared with hydrothermal method, and the effects of doping different metal ions on the ability of TiO 2 in photocatalyzing degradation of rhodamine B(RB) were studied. The results showed that the doping of Fe 3+ , Co 2+ , Ni 2+ and Cr 3+ in TiO 2 nanoparticles made the photocatalytic efficiency of the TiO 2 particles reduce and the higher the initial content of Fe 3+ , the lower the ability of TiO 2 in photocatalyzing the degradation of RB. But the doping of Zn 2+ and Cd 2+ , especially Zn 2+ , made the photocatalytic efficiency of the TiO 2 particles enhance, showing a great increase of the rate constant( k ) and the initial reaction rate( r ini ).
