摘要
为满足低温制备N掺杂TiO2可见光催化材料的需要，采用水热法制备TiO2纳米晶溶胶，再与三乙胺（TEA）直接反应制备N掺杂TiO2可见光催化剂。通过UV—Vis漫反射吸收光谱和亚甲基兰（MB）的可见光降解实验，分析比较普通方法制的TiO2纳米材料、水热法低温制得未掺N和掺N的TiO2纳米材料，发现掺N的TiO2使吸收带红移，光降解效果较前两者好。XPS分析表明，是成功掺杂N原子的TiO2结果，可能原因是N取代了部分晶格中的O，N原子的2p轨道位于O原子的2p轨道之上，从而使得价带和导带间的能量带隙变窄，引起吸收带红移，产生明显的可见光吸收。
To prepare N-doped TiO2 photocatalysts at low temperature, hydrothermal method was used to prepare TiO2 nano sol, then it directly reacted with TEA to prepare N-doped TiO2 visible-light photocatalysts. By UV-Vis diffuse reflection absorption and visible light degradation experiment of methylene blue （MB）, analysis and comparison of TiO2 nano-materials prepared by common method, TiO2 nano-materials and N-doped TiO2 nano-materials prepared by hydrothermal method at low temperature were carried out. The results show that N-doped TiO2 appers ＂red shift＂ of absorption band, its light degradation effect is better than the others. XPS analysis shows that N atoms has successfully been doped into TiO2, N atoms partly replace O atoms in the lattice, 2p orbit of N atom is located on 2p orbit of O atom, which can make energy band gap between price band and belt narrow, to result into ＂red shift＂ of absorption band and produce significant visible light absorption.
出处
《辽宁化工》
CAS
2011年第1期25-28,共4页
Liaoning Chemical Industry
关键词
水热法
低温制备
掺N
TIO2
Hydrothermal method
Low temperature preparation
N-doped
TiO2
