为了提高聚偏氟乙烯(PVDF)膜的疏水性和抗生物污染性能,以氧化石墨烯(GO)和膨润土为改性材料制备PVDF复合膜,并对其进行膜通量、截留率、拉伸强度、亲水性、孔隙率及抗生物污染性能研究。结果表明,当GO添加量为0.6%,复合膜的各项性能达到最佳;添加膨润土可以提高复合膜亲水性、拉伸强度、膜通量和截留率,但会导致孔隙率有所下降。此外,还以铜绿假单胞菌为研究对象,研究了复合膜的抗生物污染和抑菌性能,结果表明,复合膜的生物污染过程明显降低,且细菌生长缓慢,说明复合膜具有减缓生物污染的作用,具有一定的抑菌性。
In order to improve the hydrophobicity and anti-biological pollution performance of PVDF membrane,using GO and bentonite as modified materials,PVDF composite membranes were prepared,and analyzed the flux,retention rate,tensile strength,hydrophilicity,porosity and anti-biological pollution performanceof the membranes.The results showed that when the GO content was 0.6%,the performance of the membrane reached the best.Adding bentonite could improve the hydrophilicity,tensile strength,membrane flux and retention rate of the membranes,but there was a decrease in porosity.In addition,taking aeruginomonas aeruginosa as the research object,the properties of anti-biological pollution and bacteriostatic of the membranes were studied.The results showed that the process of biological pollution was significantly reduced,and the growth of bacteria went down,which indicating that the membranes could slow down the biological pollution,and had certain antibacterial performance.
[1] Wang Z H,Yu H R,Xia J F,et al.Novel GO-blended PVDF ultrafiltration membranes[J].Desalination,2012,299:50-54.
[2] 吴春凤,吕晓龙,武春瑞,等.聚氧化乙烯对聚偏氟乙烯成膜结构和性能影响[J].膜科学与技术,2016,36(5):40-46.
[3] 杨春燕.纳米ZnO/PVDF超滤膜制备及光催化降解水中对硝基苯酚性能研究[D].哈尔滨:哈尔滨工业大学,2018.
[4] Xu Z,Wu T,Shi J,et al.Photocatalytic antifouling PVDF-ultrafiltration membranes based on synergy of graphene oxide and TiO2 for water treatment[J].Journal of Membrane Science,2016,520:281-293.
[5] 康玉天.蒙脱土改性超滤膜处理含油废水的试验研究[D].北京:中国矿业大学,2018.
[6] 刘立言,裴杨,龙明策,等.表面改性GOT/PVDF超滤膜的制备及对水中微污染物的去除[J].环境工程学报,2017,11(10):5381-5386.
[7] Zhao C,Xu X,Jie C,et al.Highly effective antifouling performance of PVDF/graphene oxide composide membrane in membrane bioreactor(MBR) system[J].Desalination,2014,340(1):59-66.
[8] 朱振亚,白成玲,王磊,等.紧实型GO/PVDF复合膜对有机染料的去除性能研究[J].化工学报,2019,70(6):2361-2369.
[9] Kaneda M,Lu X,Cheng W,et al.Photografting graphene oxide to inert membrane materials to impart antibacterial activity[J].Environmental Science & Technology Letters,2019,6(3):141-147.
[10] Xu Z,Zhang J,Shan M,et al.Organosilane-functionalized graphene oxide for enhanced antifouling and mechanical properties of polyvinylidene fluoride ultrafiltration.Membranes[J].J Menbr Sci,2014,458(10):1-13.
[11] 俞铁明,改性膨润土在废水污染物处理和回收利用中的研究应用[D].浙江:浙江大学,2014.
[12] Liu X H,Duan J,Yang J H,et al.Hydrophilicity,morphology and excellent arsorption ability of poly (vinylidene fluoride) membranes induced by graphene oxide and polyvinylpyrrolidone[J].Colloids & Surfaces A Physicochemical & Engineering Aspects,2015,486:172-184.
[13] Xuan H X,He C J.Improved antifouling property of pvdf membranes with crosslinked PEG[J].Advanced Materials Research,2014,51(9):1-14.
[14] Perreault F,Toulsey M E,Elimelech M.Thinfilm composite polyamide membranes functionalized with biocidal graphene oxide nanosheets[J].Environ Sci Technol Lett,2016,1(1):71-76.
