Research Institute of Photocatalysis, State Key laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou, PR China.
Environ Sci Technol. 2009 Oct 15;43(20):7877-82. doi: 10.1021/es9018783.
A nanocrystalline CaSb2O5(OH)2 photocatalyst synthesized from CaCl2 and K2H2Sb2O7 was used to degrade benzene in the gas phase for the first time. The obtained sample was characterized by X-ray diffraction, N2 sorption-desorption, UV-vis diffuse reflectance spectroscopy, transmission electron microscopy, electron spin resonance, and X-ray photoelectron spectroscopy. The CaSb2O5(OH)2 sample had an average particle size of approximately 8 nm, a specific surface area of 101.8 m2 g(-1), and a band gap of 4.6 eV. Photocatalytic activity of the sample was mainly evaluated by the degradation of benzene in an O2 gas stream under ultraviolet light irradiation. The results demonstrated that the photoactivity of CaSb2O5(OH)2 was higher than that of commercial TiO2 (P25, Degussa Co.). In the photocatalytic degradation of benzene, it finally reached a steady conversion ratio of 29%. CaSb2O5(OH)2 has also exhibited activity toward other aromatic organic compounds. A possible mechanism of photocatalysis over CaSb2O5(OH)2 nanocrystals was proposed.
一种由 CaCl2 和 K2H2Sb2O7 合成的纳米晶 CaSb2O5(OH)2 光催化剂被首次用于气相中苯的降解。所得样品通过 X 射线衍射、N2 吸脱附、紫外-可见漫反射光谱、透射电子显微镜、电子顺磁共振和 X 射线光电子能谱进行了表征。CaSb2O5(OH)2 样品的平均粒径约为 8nm，比表面积为 101.8m2g-1，带隙为 4.6eV。通过在紫外光照射下的 O2 气流中苯的降解来主要评估样品的光催化活性。结果表明，CaSb2O5(OH)2 的光活性高于商业 TiO2（P25，Degussa Co.）。在苯的光催化降解中，其最终达到了 29%的稳定转化率。CaSb2O5(OH)2 对其他芳香族有机化合物也表现出了活性。提出了 CaSb2O5(OH)2 纳米晶光催化的可能机理。
