MFC产电辅助Fe,Ce-TiO2/Ti-Cu光催化处理染料废水

采用溶胶-凝胶法制备了Fe,Ce-TiO2/Ti膜电极，通过正交实验考察了该电极的最佳制备条件为550 ℃煅烧、掺杂摩尔比n(Fe:Ti）=6%和n(Ce:Ti）=3%。其X射线衍射(XRD)和紫外-可见漫反射(DRS)分析表明，催化剂晶型为锐钛矿，Fe、Ce掺杂抑制了晶粒的生长和金红石相的生成，使催化剂有明显的可见光响应。以Fe,Ce-TiO2/Ti为光阳极，Cu为阴极，并以微生物燃料电池(MFC)为外加电源，组装MFC电助Fe,Ce-TiO2/Ti-Cu光催化反应器，在可见光下光电催化(MPEC)处理活性艳红X-3B(RBR)。MPEC与自生电场光电催化(SPEC)和外加电场光电催化(PEC)的对比结果表明MPEC是可行的，它比SPEC的脱色率高9%，与PEC相当，但能耗更低。考察了MPEC的主要影响因素，得出最佳条件为2组MFC串联，废水流量80 mL·min-1，废水初始pH 2.56。在太阳光下，MPEC能使RBR有效脱色，处理100 min的脱色率可达87%。紫外-可见分光光谱分析表明，MPEC能使RBR的发色基团迅速遭到破坏。

MFC assisted Fe,Ce-TiO2/Ti-Cu photocatalytic treatment of dye wastewater

Fe,Ce-TiO2/Ti thin-film electrodes have been prepared by sol-gel method. The optimum preparation conditions of the electrodes were investigated by orthogonal experiments, and they were calcined at 550 ℃, doped with mole ratio n (Fe:Ti) =6% and n (Ce:Ti) =3%. The X-ray diffraction (XRD) and UV-vis diffuse reflectance spectroscopy (DRS) characterization of the electrode demonstrates the photocatalyst is anatase, Fe and Ce doping inhibited the grain growth and the rutile formation, and extended its light response wavelength to visible region. Using the prepared Fe,Ce-TiO2/Ti as photoanode and Cu as cathode, and the microbial fuel cell (MFC) as external power supply, the MFC assisted Fe,Ce-TiO2/Ti-Cu photocatalytic reactor was assembled to photoelectrocatalytic (MPEC) treat reactive brilliant red X-3B (RBR) under visible light irradiation. The main influence factors were investigated. The obtained optimal conditions are two groups of MFCs series, wastewater circulating flux 80 mL·min-1 and wastewater initial pH 2.56. Under the sun light irradiation, MPEC can decolorize RBR effectively, and the decolorization efficiency reached to 87% for 100 min treatment. UV-vis spectra analysis demonstrates the MPEC can rapidly destroy the RBR chromophore.