光催化介孔玻璃微珠载体材料的研究

Research on the photocatalytic mesoporous glass for the carrier materials

利用分相法制备了Na2O B2O3 SiO2 Al2O3 TiO2系统的多孔玻璃微珠。研究发现:当其他条件不变的情况下,随着分相温度从590℃到610℃,分相时间从24h到48h,玻璃微珠的平均孔径都在增大;当盐酸的浓度小于0.5mol/L时,玻璃微珠的孔径随着酸浓度由0.1mol/L到0.5mol/L的增加而增加;当盐酸的浓度在0.5mol/L到1mol/L时,玻璃微珠的孔径随着酸浓度的增加反而减小。当Al2O3的质量分数由0.5%增加到1.5%,玻璃微珠孔径在减小;当TiO2的质量分数由0.5%增加到1.5%,孔径则反而在增大。当玻璃的质量分数为Na2O7.50%,B2O329.20%,SiO261.80%,Al2O31.5%和TiO20.5%时,分相温度590℃和时间为24h,酸浓度和处理时间为0.1mol/LHCl和48h时,可制备出孔径分布小于50nm的光催化载体材料。

The porous glass beads of Na_2O- B_2O_3- SiO_2 - Al_2O_3-TiO_2 system were prepared by the phase separation method. The experimental result shows that the average pore diameters of glass beads increase with the temperature of phase separation from 590 ℃ to 610 ℃ and the time of phase separation from 24 h to 48 h while the other conditions keep constant, when the concentration of hydrochloric acid is less than 0.5 mol/L, the average pore diameters of glass beads increase with the concentration from 0.1 mol/L to 0.5 mol/L. Contrarily, its average pore diameters decrease with the concentration from 0.5 mol/L to 1.0 mol/L and the mass fraction of Al_2O_3 from 0.5% to 1.5% or TiO_2 from 1.5% to 0.5%. The photocatalytic mesoporous glass for the carrier materials whose pore diameter distribution is less than 50 nm can be prepared at 590 ℃ for 24 h and the acid treatment of 0.1 mol/L hydrochloric acid for 48 h when the composition of glass are Na_2O 7.50%, B_2O_3 29.20%, SiO_2 61.80%,Al_2O_3 1.5% and TiO_2 0.5%.