无机阳离子对TiO2光催化降解染料的影响

考察了6种无机阳离子对P-25 TiO2光催化降解染料的影响，结果发现，Cu^2 ，Mn^2 和Ni^2 对光催化反应有强烈的抑制作用，Ca^2 ，Mg^2 和Al^3 对光催化反应速率无明显的负影响．经X光电能谱(XPS)的分析，确定锰离子以氧化物的形式沉积在氧化钛表面，使催化剂不可逆的中毒．Cu^2 和Ni^2 通过俘获光致电子导致催化活性降低。

EFFECT OF INORGANIC CATIONS ON TiO2 PHOTOCATALYTIC DEGRADATION DYES

Influences of six common inorganic cations on the photoactivity of P 25 TiO 2 have been investgated in the photodegradation of dye acid red B.The lowest concentration of inorganic cations resulting in the deactivation of P 25 TiO 2 photocatalyst was experimented.Three cations(Cu 2 ,Mn 2 and Ni 2 )were found to inhibit the activity of photocatalyst at some or all of the concentrations tested.For calcium,magnesium and aluminium ions,there have not sinificant negative effects on photocatalytic reaction.Mn 2 was deposited on the surface of TiO 2 by oxide with X ray photoelectronic energy spectra(XPS)analysis,resulting in irreversibly catalyst fouling.Cu 2 and Ni 2 inhibited the photodegradation of acid red B by trapping photoinduced electron.