RGO/PDA/Bi12O17Cl2–TiO2 composite membranes based on Bi12O17Cl2–TiO2 heterojunctions with excellent photocatalytic activity for photocatalytic dyes degradation and oil–water separation

• Published in: Journal of materials science. Materials in electronics 2019-10, Vol.30 (19), p.18246-18258
• Main Authors: Yu, Zongxue, Feng, XiaoFang, Min, Xia, Li, XiuHui, Shao, LiangYan, Zeng, HaoJie
• Format: Article
• Language: English
• Subjects: Catalytic activity; Cellulose acetate; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chlorophenol; Dopamine; Dyes; Electron microscopy; Field emission microscopy; Graphene; Heterojunctions; Industrial applications; Light irradiation; Materials Science; Membranes; Methylene blue; Microscopy; Nanofibers; Optical and Electronic Materials; Performance degradation; Photocatalysis; Photodegradation; Photoelectrons; Polymer matrix composites; Reflectance; Separation; Spectrum analysis; Titanium dioxide; X ray photoelectron spectroscopy
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-02179-y

In the study, the reduced graphene oxide/graphitic Bi 12 O 17 Cl 2 –TiO 2 heterojunctions sheet membrane(RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 ) was fabricated by the dopamine modification and assembling the RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 composites on the surface of commercial CA(cellulose acetate) membrane to degrade methylene blue (MB) and p-chlorophenol (4-CP) to harmless products. These membrane materials were comprehensively characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectra (DRS). The results showed that RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 nanofiber membrane exhibited extremely high degradation performance with a good distribution of RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 on the CA nanofiber membrane surface. Besides, the complete photodegradation of 100 mL MB (15 mg L −1 ) solution and 100 mL 4-CP (15 mg L −1 ) solution with artificial visible-light was achieved after 100 min and 160 min, respectively. The RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 -CA composite membrane revealed the ability of continuous and simultaneous flow-through separation of oil/water emulsion and degradation of soluble organic dye under visible-light irradiation in a short time. Moreover, the nanofiber membranes exhibited excellent stability and reusability for MB-containing oil–water mixed emulsion separation has great potential to be applied in industrial application.