中山大学学报(自然科学版)
中山大學學報(自然科學版)
중산대학학보(자연과학판)
ACTA SCIENTIARUM NATURALIUM UNIVERSITATIS SUNYATSENI
2001年
3期
48-51
,共4页
固体超强酸%SO2-4/TiO2%光催化氧化%NO-2
固體超彊痠%SO2-4/TiO2%光催化氧化%NO-2
고체초강산%SO2-4/TiO2%광최화양화%NO-2
采用沉淀-浸渍法制备固体超强酸催化剂SO2-4/TiO2纳米粒子，并用XRD、BET、XPS、UV-Vis漫反射光谱等对其特性进行表征. 以NO-2为降解目标物，考察了SO2-4/TiO2光催化氧化性能. 结果表明，SO2-4/TiO2在高温下相结构稳定，TiO2的超强酸化可增大比表面积，有利于反应物吸附，同时产生吸收带边蓝移及禁带宽度增加，从而，产生较大的氧化还原势，与TiO2相比，光催化氧化活性显著提高. 焙烧温度600 ℃时催化剂活性最好.
採用沉澱-浸漬法製備固體超彊痠催化劑SO2-4/TiO2納米粒子，併用XRD、BET、XPS、UV-Vis漫反射光譜等對其特性進行錶徵. 以NO-2為降解目標物，攷察瞭SO2-4/TiO2光催化氧化性能. 結果錶明，SO2-4/TiO2在高溫下相結構穩定，TiO2的超彊痠化可增大比錶麵積，有利于反應物吸附，同時產生吸收帶邊藍移及禁帶寬度增加，從而，產生較大的氧化還原勢，與TiO2相比，光催化氧化活性顯著提高. 焙燒溫度600 ℃時催化劑活性最好.
채용침정-침지법제비고체초강산최화제SO2-4/TiO2납미입자，병용XRD、BET、XPS、UV-Vis만반사광보등대기특성진행표정. 이NO-2위강해목표물，고찰료SO2-4/TiO2광최화양화성능. 결과표명，SO2-4/TiO2재고온하상결구은정，TiO2적초강산화가증대비표면적，유리우반응물흡부，동시산생흡수대변람이급금대관도증가，종이，산생교대적양화환원세，여TiO2상비，광최화양화활성현저제고. 배소온도600 ℃시최화제활성최호.
Solid superacid SO2-4/TiO2 catalysts were prepared by the precipitation and wet impregnation, and characterized by XRD, BET, XPS, and UV-Vis diffuse reflection spectra. Their photocatalytic activities were evaluated by the degradation of nitrite. The results indicated that the photocatalytic activity and structural properties of TiO2 were greatly improved by sulfation. The sulfated TiO2 (SO2-4/TiO2) possessed higher specific surface area, and the band gap of them increased and the band edge blue-shifted,thus yielding a larger redox potential and leading to the enhanced photocatalytic oxidation activity. The sample calcined at 600 ℃ showed the most effective for the photocatalytic oxidation of nitrite.
