Department of Chemistry, Nanchang University, Nanchang 330031, China.
Photochem Photobiol Sci. 2013 Oct;12(10):1903-10. doi: 10.1039/c3pp50167a.
TiO2 was modified with sulfate and phosphate (denoted as S/TiO2 and P/TiO2) through a simple sulfuric or phosphoric acid treatment. A strong coordination bond forms between sulfate or phosphate and Ti(4+) of TiO2. Eosin Y (EY)-sensitized S/TiO2 and P/TiO2 (Pt as a co-catalyst and triethanolamine as a sacrificial electron donor) exhibit enhanced photocatalytic activity for hydrogen evolution under visible light illumination (λ > 420 nm) compared to that of EY-sensitized TiO2. The conduction band (CB) edges of S/TiO2 and P/TiO2 shift toward the negative, and the hydrogen bond interaction between the reduced radical EY˙-H and S/TiO2 or P/TiO2 is enhanced due to the inducing effect of the bound sulfate and phosphate. Thus, the photocatalytic hydrogen evolution is promoted. The effects of the concentration of the sulfuric or phosphoric acid as well as concentration of EY on the sensitization hydrogen evolution were investigated. The possible mechanism was discussed.
通过简单的硫酸或磷酸处理，将 TiO2 进行硫酸盐和磷酸盐修饰（分别表示为 S/TiO2 和 P/TiO2）。硫酸盐或磷酸盐与 TiO2 中的 Ti(4+)之间形成强配位键。与 EY 敏化 TiO2 相比，曙红 Y（EY）敏化的 S/TiO2 和 P/TiO2（Pt 作为共催化剂，三乙醇胺作为牺牲电子供体）在可见光照射（λ > 420nm）下表现出增强的光催化析氢活性。S/TiO2 和 P/TiO2 的导带（CB）边缘向负方向移动，并且由于结合的硫酸盐和磷酸盐的诱导效应，还原自由基 EY˙-H 和 S/TiO2 或 P/TiO2 之间的氢键相互作用增强。因此，促进了光催化析氢。考察了硫酸或磷酸浓度以及 EY 浓度对敏化析氢的影响。讨论了可能的机制。
