纳米氧化石墨烯改性PVDF微滤膜在MBR中的抗污染性能

第68卷第1期2017年1月化工学报CIESCJournalV_o1．68No．1January2017‘乒：：：=：=0￡(：’研究论文：：；：：：：：=jDOI：10．119490．issn．0438—1157．20160769纳米氧化石墨烯改性PVDF微滤膜在MBR中的抗污染性能赵传起，杨悦锁，徐晓晨，杨凤林(沈阳大学环境学院，辽宁沈阳110044；大连理工大学环境学院，辽宁大连116024)摘要：利用强亲水性氧化石墨烯(GO)作为添加剂，自制了PVDF／GO复合微滤膜，并将其应用于MBR系统中，进行长期应用研究。研究发现，共混膜的表面性质得到改善，其表面含氧基团达到29．33％(GO：3％)；共混膜与PVDF膜对污染物的去除效果相近，但共混膜(G0=3％)仅进行了一次清洗，清洗周期是PVDF的4倍；PVDF／GO共混膜的膜阻力要低于PVDF膜，并且共混膜的不可逆污染阻力显著下降，其数值仅仅是PVDF膜的9．O％(G0=3％)；EPS分析发现，共混膜表面的EPS浓度明显减少，其降幅分别达到59．98％(GO=1％)和69．57％(GO=3％)，抗污染性能显著提高；通过SEM与CLSM分析发现，随着氧化石墨烯加入量的提高，共混膜表面形成了滤饼层变得疏松，厚度也变薄，甚至露出了部分膜表面(G0=3％)，保证了共混膜稳定的渗透率。关键词：膜；环境；纳米材料；氧化石墨烯；亲水改性；膜污染中图分类号：X703．1文献标志码：A文章编号：0438—1157(2017)01—0375—10AntifoulingperformanceofgrapheneoxidemodifiedPVDFmicrofiltrationmembranesinmembranebioreactorZHAOChuanqi，YANGYuesuo，XUXiaochen，YANGFenglin(1SchoolofEnvironmentalScienceandTechnology，ShenyangUniversity，Shenyang110044，Liaoning，China；SchoolofEnvironmentalScienceandTechnology，DalianUniversityofTechnology，Dalian116024，Liaoning，China)Abstract：Polyvinylidenefluoride(PVDF)／grapheneoxide(G0)nanocompositemembranes，whichweremadeofPVDFnaocompositeswithdifferentcontentofsuperhydrophilicgrapheneoxide(G0)nanosheets，wereassessedforlongtermapplicationinamembranebioreactor(MBR)system．Criticalflux，MBRperformance，membraneresistance，andanti—foulingpropertieswereintensivelystudied．SurfacehydrophilicityofPVDF／G0membraneswasimprovedwithpresenceofsurficialoxygen-containinggroupsupto29．33％(G0=3％)．PVDF／GOmembranesshowedsimilaranti．foulingtoPVDFcontrolmembrane．however,PVDF／GO(GO=3％)membranerequiredonlyonecleaningwithcleaningcycle4timeslongerthanPVDFcontro1．PVDF／GOmembranehadlowermembraneresistancethanPVDFcontrolandsignificantreductioninirreversiblefoulingresistance．Asanexample，PVDF／GO(GO=3％1membranehadabout9％ofirreversiblefoulingresistanceofPVDFcontro1．AntifoulingimprovementofPVDF／GOmembranewasfurthershownbyEPSstudythatmuchlowerEPSintensitieswereobservedwithareductionof59．98％(GO=l％and69．57％(GO=3％1incomparisontoPVDFcontro1．Scanningelectronmicroscopy(SEM)an