Key Laboratory of Design and Synthesis of Functional Materials and Green Catalysis, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025, PR China.
J Hazard Mater. 2013 Oct 15;261:44-54. doi: 10.1016/j.jhazmat.2013.07.016. Epub 2013 Jul 18.
A novel high-performance Sm, N, P-tridoped anatase-TiO₂ nano-photocatalyst (SNPTO) was successfully prepared by a modified sol-solvothermal process. The physicochemical properties of as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption isotherm, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, UV-vis absorbance spectroscopy, photoluminescence spectroscopy, and zeta potential measurements. The results showed that, among as-prepared undoped, single-doped, and codoped samples, SNPTO presented the highest photoactivity for degrading 4-chlorophenol (4-CP) under simulated sunlight irradiation with the apparent rate constant of 2.83×10(-2)min(-1), which was 3.98 times more than that of commercial P25 TiO₂ (kapp=7.11×10(-3)min(-1)). The TOC removal rate for 4-CP solution (20 mg L(-1)) in the presence of SNPTO (0.4 g L(-1)) reached 87.13% after simulated sunlight irradiation for 120 min, indicating that 4-CP could be mineralized efficiently. Experiments concerning radical scavengers indicated that OH in the solution was the main reactive species. The enhanced photoactivity of SNPTO was attributed to a synergistic effect of the more efficient inhibition of the recombination of photogenerated electrons and holes, the increase in the visible light absorption ability, surface hydroxyl and specific surface area, as well as the improvement of the surface textural properties. SNPTO exhibited good photochemical stability and could be reused for 5 times with less than 1.6% decrease in the 4-CP removal efficiency.
一种新型高性能 Sm、N、P 三掺杂锐钛矿-TiO₂纳米光催化剂（SNPTO）通过改进的溶胶-溶剂热法成功制备。通过 X 射线衍射、透射电子显微镜、N2 吸附-脱附等温线、X 射线光电子能谱、傅里叶变换红外光谱、紫外-可见吸收光谱、光致发光光谱和动电电位测量对所制备样品的物理化学性质进行了表征。结果表明，在所制备的未掺杂、单掺杂和共掺杂样品中，SNPTO 在模拟太阳光照射下对降解 4-氯苯酚（4-CP）表现出最高的光活性，表观速率常数为 2.83×10(-2)min(-1)，是商业 P25 TiO₂（kapp=7.11×10(-3)min(-1)）的 3.98 倍。在 SNPTO（0.4 g L(-1)）存在下，4-CP 溶液（20 mg L(-1)）的 TOC 去除率在模拟太阳光照射 120 min 后达到 87.13%，表明 4-CP 可被有效矿化。有关自由基清除剂的实验表明，溶液中的 OH 是主要的反应性物质。SNPTO 增强的光活性归因于更有效地抑制光生电子和空穴的复合、增加可见光吸收能力、表面羟基和比表面积以及改善表面织构性质的协同效应。SNPTO 表现出良好的光化学稳定性，可重复使用 5 次，4-CP 去除效率降低小于 1.6%。
