聚偏氟乙烯纳滤膜制备及其处理模拟活性黑废水

为研制适用于染料废水处理的新型纳滤膜,以自制的PVDF膜为基膜,通过溶胶-凝胶方法在膜表面涂覆TiO2纳米颗粒层,然后再涂敷多巴胺/PEI层,以制备PVDF纳滤膜.考察了制备条件对膜的表面特性及过滤性能的影响.结果表明,TiO2和多巴胺/PEI可以顺序的涂覆在PVDF膜表面.表面涂覆后,膜的通量急剧下降,截留率大幅度上...

Preparation of Polyvinylidene Fluoride Nanofiltration Membrane and Its Treatment of Simulated Activated Black Wastewater

In order to develop a new type of nanofiltration membrane suitable for dye wastewater treatment,a self-made PVDF membrane was used as the base membrane,and a TiO₂ nanoparticle layer was coated on the surface of the membrane by a sol-gel method,and then a dopamine/PEI layer was coated to prepare PVDF nanofiltration membrane.Effects of preparation conditions on membrane surface characteristics and filtration performance were investigated.The results showed that,TiO₂ and dopamine/PEI could be sequentially coated on the surface of PVDF membrane.After the surface was coated,the membrane flux decreased sharply and the rejection rate increased sharply.As the coating time increased,the hydrophilicity of the membrane increased,the pore size of the membrane surface increased,the membrane flux rose,and the rejection rate decreased.The retention of PEG2000 and RB5 were 92%,75%,56%and 83%,62%,44%respectively when coating time were 6 h,12 h,24 h respectively which means retention of PVDF nanofiltration membranes was the highest when the coating time was 6 h.At this time,the stable flux of the membrane to the PEG2000 and RB5 solutions were 210 and 105 L/(m²·h)respectively.