• 关键词：超滤膜  TiO₂纳米颗粒  原位植入  抗生物污染

• 基金项目：国家自然科学基金（No.51278268）

• 黄小川
• 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 王小亻毛
• 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 杨宏伟
• 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 解跃峰
• 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 摘要：选用TiO₂纳米颗粒通过原位植入法对聚砜超滤膜表面进行改性，通过调节pH及沉淀浴中TiO₂浓度制备出不同TiO₂覆盖率的改性聚砜超滤膜，并分别用扫描电子显微镜、接触角测定仪、激光共聚焦显微镜等对改性膜性能进行评价.结果表明，pH为4时TiO₂分散良好并植入到聚砜膜表面，改变沉淀浴的浓度可以有效控制TiO₂在聚砜膜表面的覆盖率.聚砜膜的亲水性随TiO₂覆盖率的提高而不断增强.在纯水通量下降不明显的情况下，TiO₂改性超滤膜的抗生物污染性能均优于未改性膜，随着覆盖率的提高，抗生物污染性能呈现先增强后减弱的趋势，在覆盖率介于22.4%~27.7%之间时改性膜具有最优的抗生物污染性能，可使微生物粘附减少93%，黑暗培养24 h的生物膜厚度减少70%以上.

• Abstract：The in-situ embedment approach was adopted to surface-modify polysulfone ultrafiltration membranes using TiO₂ nanoparticles. The coverage ratio of nanoparticles on membranes surface was changed by varying the pH and TiO₂ nanoparticle concentration in the water (coagulation) bath. The membranes were characterized and evaluated by scanning electron microscope observation, contact angle measurement and conducting anti-biofouling test using P. aeruginosa. The results show that the well-dispersed TiO₂ nanoparticles in the water bath of pH 4 were successfully embedded onto the membrane surface with the coverage ratio being variable. A membrane was more hydrophilic when the TiO₂ coverage ratio was higher. Compared with the unmodified membrane, the modified membrane had a similar filterability and a higher anti-biofouling ability. The anti-biofouling ability was dependent on the TiO₂ coverage ratio. The best anti-biofouling performance was achieved when the coverage ratio was between 22.4% and 27.7%, for which the P. aeruginosa adhesion (after 12-hour cultivation) reduced by 90% and the biofilm thickness (after 24-hour cultivation) decreased by 70%.

• Key words：ultrafiltration  TiO₂ nanoparticles  in-situ embedment  anti-biofouling

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