研究报告

  • 李冬梅,程志华,黄明珠,林显增,谢昱,蒋树贤.可见光响应GO/g-C3N4改性平板膜的制备条件及其表面性能[J].环境科学学报,2018,38(10):3979-3989

  • 可见光响应GO/g-C3N4改性平板膜的制备条件及其表面性能
  • The preparation of visible-light photoresponsive GO/g-C3N4 modified plate membrane and its surface properties
  • 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)
  • 作者
  • 单位
  • 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(Eg)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 (Eg) 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%.

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