• 关键词：氧化石墨烯  石墨相氮化碳  超滤膜表面改性  表面性能  可见光催化能力

• 基金项目：国家自然科学基金（No.51378129，51108094）；广东省自然科学基金（No.2017A030313321，2015A030313494）；广东省高教厅-普通高校特色创新类项目（No.2016KTSCX035）

• 李冬梅
• 广东工业大学, 土木工程学院, 广州 510006

• 程志华
• 广东工业大学, 土木工程学院, 广州 510006

• 黄明珠
• 佛山水业集团有限公司, 佛山 528500

• 林显增
• 佛山水业集团有限公司, 佛山 528500

• 谢昱
• 广东工业大学, 土木工程学院, 广州 510006

• 蒋树贤
• 广东工业大学, 土木工程学院, 广州 510006

• 摘要：以氧化石墨烯（GO）与石墨相氮化碳（g-C₃N₄）为改性剂，采用界面聚合与超滤抽吸结合，对PVDF平板超滤膜（简称原膜）进行表面改性，得到可见光响应的纳米复合改性膜（简称：GO/g-C₃N₄改性膜），研究改性膜的制备条件及其表面性能.结果表明：①最佳制备条件为：g-C₃N₄ 10 mg、g-C₃N₄/GO比值为80、苯胺（An）浓度0.5%、An浸泡时间4 h、过硫酸铵（APS）浓度0.8 g·L^-1、APS浸泡时间3 h；②GO/g-C₃N₄改性膜表面亲水性与抗污染性能显著提高，表面接触角下降55.1%，通量衰减率下降46.3%，经水力冲洗后膜通量恢复率增加51.5%；③改性膜的机械强度与拉伸强度增强，拉伸弹性模量增加；④GO/g-C₃N₄改性膜表面具有较强的可见光活性，最大吸收边带为495 nm，表面改性功能层的禁带宽度（E_g）值为2.5 eV.改性膜对罗丹明B（RhB）的可见光催化降解去除率达到81.2%，而原膜对RhB吸附去除率仅为42.2%.

• Abstract：The graphene oxide (GO) and carbon nitride in graphite phase (g-C₃N₄) -coated membrane (for short GO/g-C₃N₄ modified membrane) were prepared with polyvinylidene fluoride hollow fiber plate ultrafiltration membrane (for short PVDF membrane) as the raw material, GO and g-C₃N₄ as the modifiers, the interface polymerization method combined with the pumping adsorption way as the modification technology. The preparation conditions of the GO/g-C₃N₄ modified membrane with visible-light-response were investigated. The surface characteristics of GO/g-C₃N₄ modified membrane were explored. The investigation results were shown as below:① The optimal preparation conditions were:g-C₃N₄ 10 mg, the ratio of g-C₃N₄ to GO 80, aniline (An) 0.5%, the immersion time in the An solution 4 hour, ammonium persulfate (APS) 0.8 g·L^-1, the immersion time in the APS solution 3 hour; ② The hydrophilicity and the antifouling properties on the surface of the GO/g-C₃N₄ modified membrane were improved significantly. The contact angle and the flux attenuation rate of the modified membrane decreased by 55.1% and 46.3% respectively. The membrane flux recovery rate was increased by 51.5% after hydraulic cleansing. ③Compared with the original PVDF membrane, the GO/g-C₃N₄ modified one has an enhanced mechanical strength and tensile strength, and also an increased tensile elastic modulus. ④ The GO/g-C₃N₄ modified membrane has strong visible-light-responsive activity. The maximum absorption sideband is 495 nm, and the surface modification functional layer has a band gap (E_g) value of 2.5 eV. The degradation rate of the GO/g-C₃N₄ modified membrane with visible-light response to Rhodamine B(RhB) was 81.2%, while the RhB removal rate of the original one with only adsorption and interception ability was 42.2%.

• Key words：graphene oxide (GO)  nitride carbon in graphite phase (g-C₃N₄)  surface modification of utrafiltration membrane  surface characteristics  visible-light photocatalysis activity

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