West Pomeranian University of Technology, Institute of Chemical and Environment Engineering, Department of Water Technology and Environment Engineering, ul. Pułaskiego 10, 70-322 Szczecin, Poland.
J Hazard Mater. 2012 Feb 15;203-204:128-36. doi: 10.1016/j.jhazmat.2011.11.088. Epub 2011 Dec 8.
Photocatalytic activity of nitrogen modified TiO(2) calcined at temperatures of 100-350°C toward 3-chlorophenol (3-CP) degradation was studied. In the experiments the fluorescent UV lamp and the incandescent lamp emitting mainly Vis light were applied. The degradation efficiency was evaluated on a basis of changes of 3-CP, total organic carbon and Cl(-) concentration. A significant improvement of the photoactivity of the N-modified photocatalysts compared to the reference sample was observed. The rate of 3-CP degradation increased with the calcination temperature, and the highest efficiency was achieved for TiO(2) annealed at 350°C. After 5h of UV irradiation in the presence of TiO(2)/N-350 and reference TiO(2) the 3-CP concentration decreased for 77% and 36%, respectively. The 3-CP removal after 24h of Vis irradiation was 30% and 12% for the N-modified and reference samples, respectively. The 3-CP decomposition and mineralization were greatly influenced by pH of the solution, achieving the highest rate at pH 7 for the modified photocatalysts. An increase of the calcination temperature resulted in an increase of the rate of OH formation. The photocatalytic activity of the N-modified TiO(2) remained unchanged during repeated photocatalytic degradation cycles.
研究了在 100-350°C 温度下煅烧的氮掺杂 TiO2 对 3-氯苯酚（3-CP）降解的光催化活性。在实验中，应用了荧光紫外灯和主要发射可见光的白炽灯。通过 3-CP、总有机碳和 Cl(-)浓度的变化来评估降解效率。与参比样品相比，N 修饰的光催化剂的光活性有了显著提高。3-CP 降解的速率随煅烧温度的升高而增加，在 350°C 下退火的 TiO2 效率最高。在 TiO2/N-350 和参比 TiO2 的存在下，经 5hUV 照射后，3-CP 浓度分别降低了 77%和 36%。在 Vis 照射 24h 后，N 修饰和参比样品的 3-CP 去除率分别为 30%和 12%。溶液 pH 对 3-CP 的分解和矿化有很大影响，对于改性光催化剂，在 pH 7 时达到最高速率。煅烧温度的升高导致 OH 形成速率增加。N 修饰的 TiO2 的光催化活性在重复光催化降解循环中保持不变。
