The iron doping titanium dioxide was prepared by sol-gel,step precipitation,co-precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X-3B dispersion...The iron doping titanium dioxide was prepared by sol-gel,step precipitation,co-precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X-3B dispersion irradiated under UV.The experimental results showed that the immersion method,especially using the nano TiO2 as immersion matrix,greatly enhanced the photocatalytic activity.One fold enhancement in photocatalytic activity was observed in the case of the sample prepared by immersion doping method.This may be attributed to the nano-size effect,the irreversible hole trapper in non-saturated bonding field of Fe3＋ and larger lattice strain.展开更多
In this investigation, MCM 41 mesoporous molecular sieve was firstly synthesized with tetraethyl orthosilicate(TEOS) as the silica source and cetyltrimethyl ammonium bromide(CTMABr) as the template by microwave radiat...In this investigation, MCM 41 mesoporous molecular sieve was firstly synthesized with tetraethyl orthosilicate(TEOS) as the silica source and cetyltrimethyl ammonium bromide(CTMABr) as the template by microwave radiation method (including the processes of crystallization and de template).The product obtaind was characterized by XRD, TG, IR, SEM. The influence of the conditions of microwave radiation on the structure of MCM 41 mesoporous molecular sieve was mainly discussed .The results showed that MCM 41 mesoporous molecular sieve with high purity, good thermal stability and a spherical hexagonal morphology, the diameter of the crystalline particles about 2～10μm was obtained.展开更多
文摘The iron doping titanium dioxide was prepared by sol-gel,step precipitation,co-precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X-3B dispersion irradiated under UV.The experimental results showed that the immersion method,especially using the nano TiO2 as immersion matrix,greatly enhanced the photocatalytic activity.One fold enhancement in photocatalytic activity was observed in the case of the sample prepared by immersion doping method.This may be attributed to the nano-size effect,the irreversible hole trapper in non-saturated bonding field of Fe3＋ and larger lattice strain.
文摘In this investigation, MCM 41 mesoporous molecular sieve was firstly synthesized with tetraethyl orthosilicate(TEOS) as the silica source and cetyltrimethyl ammonium bromide(CTMABr) as the template by microwave radiation method (including the processes of crystallization and de template).The product obtaind was characterized by XRD, TG, IR, SEM. The influence of the conditions of microwave radiation on the structure of MCM 41 mesoporous molecular sieve was mainly discussed .The results showed that MCM 41 mesoporous molecular sieve with high purity, good thermal stability and a spherical hexagonal morphology, the diameter of the crystalline particles about 2～10μm was obtained.
