摘要:
以工业偏钛酸为原料,利用水热晶化制备多孔二氧化钛光催化剂,考察了不同水热晶化时间对多孔二氧化钛结构和性能的影响。采用XRD、SEM、FT-IR、N2低温吸附-脱附对样品进行表征,并以亚甲基蓝光催化降解体系评价其光催化活性。随着晶化时间的延长,多孔二氧化钛的光催化活性呈现先增大、后减小的趋势。140℃水热晶化2 h所得多孔二氧化钛的光催化活性最佳,反应1 h后对亚甲基蓝的降解率达81.18%,其比表面积SBET=99.59 m2/g,孔体积VP=0.271 cc/g,平均孔径DBJH=3.809 nm,晶粒尺寸17.79 nm。
Abstract:
Porous TiO2 photocatalyst was prepared via hydrothermal crystallization of industrial metatitanic acid,and the effects of crystallization time on structures and properties of porous TiO2 were also investigated.The samples so prepared were characterized by XRD,SEM,XPS,FT- IR and nitrogen absorption-desorption,and its photocatalytic activity was evaluated by photocatalytic degradation of methylene blue.With the extension of the crystallization time,the photocatalytic activity increased initially and then gradually decreased.Porous TiO2 crystallized at 140℃ for 2 h showed the best photocatalytic activity,with the degradation rate of 81.18% 1 h after reaction.And its specific surface area SBET,pore volume VP,average pore size DBJH and crystal size are 99.59 m2/g,0.271 cc/g,3.809 nm and 17.79 nm respectively.
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