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Photocatalytic activity of size and phase selective TiO2 nanoparticles prepared by the membrane processing

机译：膜法制备的尺寸和相选择性TiO2纳米粒子的光催化活性。

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摘要

In order to investigate the photocatalytic degradation of phenol and methylene blue (MB) in aqueous solutions containing TiO2 nanoparticles with different particle sizes and crystalline phases, an integrated membrane process combining microfiltration (MF) and ultrafiltration was introduced for the production and size separation of TiO2 nanoparticles. TiO2 nanoparticles obtained were characterized by XRD, TEM, SEM and BET techniques. The characterization results show that TiO2 nanoparticles with various sizes and BET surface areas were obtained after MF fractionation. The size of TiO2 nanoparticles from large to small follows the order: the retentate > the feed > the permeate while the sequence of BET surface area follows the order: the permeate > the feed > the retentate. Furthermore, a smaller disperse coefficient was achieved for both the permeate and the retentate in comparison with the feed. The studies on the photocatalytic oxidation of phenol and MB with TiO2 nanoparticles before and after MF fractionation concluded that both the particle size and crystallite phase had strong influence on their photocatalytic performances.
机译：为了研究不同粒径和晶相的TiO2纳米颗粒在水溶液中对苯酚和亚甲基蓝（MB）的光催化降解，引入了微滤（MF）和超滤相结合的集成膜工艺用于TiO2的生产和尺寸分离纳米粒子。通过XRD，TEM，SEM和BET技术对获得的TiO2纳米颗粒进行了表征。表征结果表明，MF分离后得到了各种尺寸和BET表面积的TiO2纳米颗粒。 TiO2纳米粒子的大小从大到小依次为：渗余物>进料>渗透物，而BET表面积顺序则为：渗透物>进料>渗余物。此外，与进料相比，渗透物和截留物均实现了较小的分散系数。 MF分馏前后，TiO2纳米颗粒对苯酚和MB的光催化氧化研究表明，粒径和微晶相对它们的光催化性能都有很大的影响。

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