Key Lab of Functional Inorganic Materials Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials Science, Harbin 150080, PR China.
Chem Commun (Camb). 2012 Nov 11;48(87):10775-7. doi: 10.1039/c2cc34973f.
The surface modification with a proper amount of phosphate accelerates the dynamic decay of photogenerated electrons in the nanocrystalline anatase TiO(2) film in the presence of O(2), consequently prolonging greatly the lifetime of photogenerated holes so as to improve the charge separation of TiO(2) and then its photocatalytic activity for degrading gas-phase acetaldehyde and liquid-phase phenol mainly based on the transient absorption spectra and the measurements of electrochemical O(2) reduction and the produced hydroxyl radical amount. The acceleration effects are attributed to the increased amount of adsorbed O(2) by means of the curves of O(2) temperature-programmed desorption.
适量的磷酸盐表面修饰在存在 O2 的情况下加速了纳米晶锐钛矿 TiO2 薄膜中光生电子的动态衰减，从而大大延长了光生空穴的寿命，从而提高了 TiO2 的电荷分离效率，进而提高了其光催化降解气相乙醛和液相苯酚的活性。主要基于瞬态吸收光谱和电化学 O2 还原以及产生的羟基自由基量的测量。加速效应归因于通过 O2 程序升温脱附曲线吸附 O2 量的增加。
