关键词: 铁掺杂二氧化钛;固相合成;能隙调控;吡啶;光催化降解

Abstract: Fe doped TiO2 ultrafine powder materials (Fe-TiO2) were synthesized though a simple solid-state reaction method at a low-temperature.The textural properties of these materials were characterized by XRD, UV-Vis, SEM/EDS, N2 adsorption-desorption.And the influence of material for engery band-gap from various feed ratios and templates, the intrinsic relations between the microstructural parameters and photocatalytic degradation of pyridine were investigated.The results show that Fe3+ entering into the lattice of anatase TiO2 is mainly from the c-axis by isomorphous replacement and thus the charge density of c-axis projection direction increases.Moreover, the effective regulation of energy band-gap for the Fe-TiO2 powders is determined by the different templates and various feed molar ratios of nFe∶nTi, but the regulation function of the template is relatively obvious.And it is a positive correlation between the lattice mismatch rate and photocatalytic performance.Under the CTAB as template and the various feed molar ratios of nFe∶nTi, the visible light degradation rate (k) of the pyridine solution on Fe-TiO2 powders follows as kFe-TiO2(nFe/nTi=5∶10) (98.27;)>kFe-TiO2(nFe/nTi=3∶10) (89.63;)>kFe-TiO2 (nFe/nTi=2∶10) (83.68;)>kFe-TiO2 (nFe/nTi=1∶10) (78.08;)>kTiO2(10.13;), and on the condition of the ratio of nFe/nTi=1∶10 with different templates, the k value is kSDS(94.24;)>kCTAB(78.08;)>kSDBS(70.15;)>kDHSB(64.58;).However, the photocatalytic degradation efficiency of pyridine mainly depend on the energy of photogenerated carriers rather than the specific surface area and the width of energy gap.

Key words: Fe doped TiO2 ultrafine powder materials (Fe-TiO2) were synthesized though a simple solid-state reaction method at a low-temperature.The textural properties of these materials were characterized by XRD, UV-Vis, SEM/EDS, N2 adsorption-desorption.And the influence of material for engery band-gap from various feed ratios and templates, the intrinsic relations between the microstructural parameters and photocatalytic degradation of pyridine were investigated.The results show that Fe3+ entering into the lattice of anatase TiO2 is mainly from the c-axis by isomorphous replacement and thus the charge density of c-axis projection direction increases.Moreover, the effective regulation of energy band-gap for the Fe-TiO2 powders is determined by the different templates and various feed molar ratios of nFe∶nTi, but the regulation function of the template is relatively obvious.And it is a positive correlation between the lattice mismatch rate and photocatalytic performance.Under the CTAB as template and the various feed molar ratios of nFe∶nTi, the visible light degradation rate (k) of the pyridine solution on Fe-TiO2 powders follows as kFe-TiO2(nFe/nTi=5∶10) (98.27;)>kFe-TiO2(nFe/nTi=3∶10) (89.63;)>kFe-TiO2 (nFe/nTi=2∶10) (83.68;)>kFe-TiO2 (nFe/nTi=1∶10) (78.08;)>kTiO2(10.13;), and on the condition of the ratio of nFe/nTi=1∶10 with different templates, the k value is kSDS(94.24;)>kCTAB(78.08;)>kSDBS(70.15;)>kDHSB(64.58;).However, the photocatalytic degradation efficiency of pyridine mainly depend on the energy of photogenerated carriers rather than the specific surface area and the width of energy gap.