摘要
自制氧化石墨烯(GO)与纳米TiO_2复合改性PVDF中空纤维超滤膜(简称GOTiO_2改性PVDF膜),测定其表面功能特性,考察其对微污染物腐殖酸(HA)的截留特性与抗污染性能。结果表明:GO-TiO_2改性PVDF膜的静态水接触角下降为38. 6°±1. 2°(原膜为80. 6°±1. 8°),表面亲水性能得到很大改善。改性后膜表面富含大量的—COOH、—OH等亲水性基团,亲水性表面为GO-聚酰胺-TiO_2复合结构。GO-TiO_2改性PVDF膜的通量衰减率得到显著改善,其通量总衰减率下降到35. 6%(改性前总衰减率为51. 2%);改性膜不可逆衰减率大幅下降,约为原膜的1/4。改性膜抗污染性能明显改善,其对HA的静态吸附量由改性前的295. 0 mg/m2下降到158. 6 mg/m2。水力反冲洗能使GO-TiO_2改性PVDF膜的通量恢复率达到94%,而原膜只有69%。GO-TiO_2改性PVDF膜的截留性能得到显著提升,其对HA的截留率从81. 0%上升到90. 1%,过滤周期延长了约2. 5倍。
PVDF hollow fiber membrane modified by graphene oxide （GO） and nano-TiO2 （GO - TiO2 modified PVDF membrane） was synthesized and its surface functional properties were investigated. Meanwhile, the interception behaviors to humic acid （HA） and the antifouling characteristics were ex- plored. The contact angle of the GO - TiO2 modified PVDF membrane decreased from 80.6° ± 1.8° to 38.6°±1.2°. The hydrophilicity of the modified membrane improved significantly. The surface of the modified membrane had a GO - polyamide - TiO2 composite structure and was packed with hydrophilia polar groups （ carboxyl and hydroxyl）. The flux decay rate of the modified membrane decreased remarkably from 51.2% to 35.6%. The irreversible decay rate of the modified membrane dropped dramatically bv 75% approximately. The antifouling properties of the modified membrane improved substantially. Thestatic adsorption of HA by the modified membrane was 158.6 mg/m2, comparing to the original 295.0 mg/m2. The hydraulic backwashing could restore 94% of the flux rate, which was much higher than that of the original PVDF membrane （69%）. The separation and interception behaviors of the GO- TiO2 modified membrane were enhanced considerably. The interception rate of HA increased from 81.0% to 90.1%. The filtration cycle was extended by 2.5 times.
作者
叶挺进
李冬梅
刘贝
江鹏
YE Ting-jin;LI Dong-mei;LIU Bei;JIANG Peng(Foshan Water Group Co.Ltd.,Foshan 528000,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;Foshan Environmental Protection Investment Co.Ltd.,Foshan 528000,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第17期39-43,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51108094
51378129)
广东省自然科学基金资助项目(2017A030313321)
广东省普通高校特色创新类项目(2016KTSCX035)
