摘要
选用TiO_2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p H及沉淀浴中TiO_2浓度制备出不同TiO_2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,p H为4时TiO_2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TiO_2在聚砜膜表面的覆盖率.聚砜膜的亲水性随TiO_2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,TiO_2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.
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%.
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第5期1711-1721,共11页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.51278268)~~
