醌基氧化石墨烯介体膜的制备与催化 偶氮染料生物降解
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1.厦门理工学院 环境科学与工程学院;2.厦门理工学院 厦门市膜技术研发与应用重点实验室,福建 厦门361024

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福建省自然科学基金资助项目(2019J01847);厦门市科技计划(2022CXY0408)


Preparation of a Quinone-Graphene Oxide Membrane and Its Application to Catalyzing Biodegradation of Azo Dyes
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    摘要:

    氧化还原介体能催化加速偶氮染料的生物降解,但易随水流失,介体的膜基固定化为研究提供了新思路。本文以聚偏氟乙烯(PVDF)为聚合物,醌基氧化石墨烯(AQS-RGO)为氧化还原介质,采用相转化法制备了氧化还原介体(AQS-RGO/PVDF)膜,探究介体膜催化偶氮染料生物降解的性能。采用X射线衍射仪(XRD)和X射线光电子能谱仪(XPS)对膜进行表征,结果表明AQS-RGO已被成功固载在膜上。利用扫描电镜(SEM)和原子力显微镜(AFM)对膜结构和形貌进行表征,结果表明AQS-RGO介体的引入,使膜内胞腔变小,海绵孔变得更致密。同时,对膜的接触角、水通量和截留率进行测定。发现AQS-RGO的添加使膜具有更好的亲水性和渗透性,最大纯水通量为283.09L/m2?h,比PVDF原膜高4.7倍。在最佳条件下制备的AQS-RGO/PVDF膜能够将活性红X-3B的降解(脱色率≥90%)时间从48h缩短到30h,表明其对偶氮染料生物降解具有较好的催化效果,并且在活性红和酸性红染料的4次循环实验中都能保持90%以上的脱色率,具有良好的稳定性,展示氧化还原介体膜的应用潜力。

    Abstract:

    Redox mediators can catalyze and accelerate the biodegradation of azo dyes, but they are easily lost in water. The immobilization of the Redox medium on the membrane. provides a new idea for research. In this paper, a redox mediator membrane (AQS-RGO/PVDF) was prepared by phase inversion method using poly(vinylidene fluoride) (PVDF) as the polymer and quinone-based graphene oxide (AQS-RGO) as the Redox medium to explore the catalytic performance of the membrane for the biodegradation of azo dyes. The membranes were characterized by XRD and X-ray photoelectron spectroscopy (XPS), and the results showed that AQS-RGO was successfully immobilized on the membrane. The membrane structure and morphology were characterized by SEM and atomic force microscopy (AFM), and the results showed that the addition of the AQS-RGO mediator made the spongy pores in the membrane denser. Moreover, the contact angle, water flux and rejection of the membrane were measured. It was found that the addition of AQS-RGO made the membrane has better hydrophilicity and permeability, and the maximum pure water flux was 283.09 L/m2?h, which was 4.7 times higher than that of the original PVDF membrane. The AQS-RGO/PVDF membrane prepared under the optimal conditions can shorten the degradation time (decolorization rate ≥90%) of reactive red X-3B from 48h to 30h, indicating that it has a good catalytic effect on the biodegradation of azo dyes. In addition, it can maintain a decolorization rate of more than 90% in 4 cycles of reactive red and acid red dyes. Redox medium membrane has good stability, showing the application potential of the membrane.

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  • 收稿日期:2022-05-24
  • 最后修改日期:2022-09-16
  • 录用日期:2022-09-21
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