无机阳离子对TiO_2光催化降解染料的影响

EFFECT OF INORGANIC CATIONS ON TiO_2 PHOTOCATALYTIC DEGRADATION DYES

考察了 6种无机阳离子对P 2 5TiO2 光催化降解染料的影响 ,结果发现 ,Cu2 +,Mn2 +和Ni2 +对光催化反应有强烈的抑制作用 ,Ca2 +,Mg2 +和Al3+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 .Cu2 +和Ni2

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.