Fabrication of organic-inorganic nanofiltration membrane using ordered stacking SiO2 thin film as rejection layer assisted with layer-by-layer method

作者：Ding, Wande; Zhuo, Huiwei; Bao, Mutai^*; Li, Yiming; Lu, Jinren

来源：Chemical Engineering Journal, 2017, 330: 337-344.

DOI：10.1016/j.cej.2017.07.159

• Organic-inorganic membrane
• Nanofiltration
• Silica
• Layer-by-layer
• Water purification

In the past decades, application of nanomaterials in fabrication of organic-inorganic composite nanofiltration (NF) membrane for membrane performance improvement has been intensively studied. Herein, novel SiO2 organic-inorganic NF membrane was achieved using an ultrathin and ordered stacking SiO2 thin film as rejection layer assisted with layer-by-layer method. The resultant membrane showed a great enhancement in hydrophilicity with a membrane surface charge of -44 mV. It exhibited typical characteristics of negatively charged NF membranes because of the rejection against negatively charged methyl blue and methyl orange was 99.5% and 97.6%, while the rejection for positively charged methylene blue decreased to 90.1%. Correspondingly, the water flux declined from 20 L/m(2).h to 9.1 L/m(2).h using 20 ppm dye solutions as feed solution at 4 bar. In addition, the salt rejection of the produced membrane followed the sequence of MgSO4 (88.7%) > Na2SO4 (82.1%) > MgCl2 (64.5%) > NaCl (43.1%), which was in accordance with the size exclusion and Donnan effect. The SiO2 organic-inorganic membrane presented a remarkable stability under high operating pressure as well as long-term NF test. To conclude, this work paves a new avenue to fabricate highly permeable and selective NF membrane by using inorganic thin film as rejection layer.

• 出版日期2017-12-15
• 单位中国海洋大学