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论文类型：期刊论文

发表时间：2016-08-01

发表刊物：Frontiers of Environmental Science & Engineering

收录刊物：SCIE、EI、Scopus

卷号：10

期号：4

ISSN号：2095-2201

关键字：Bio-anode; Photocatalytic cathode; Fe-o/TiO2; ESR; Dye and antibiotics; Advanced oxidation

摘要：In this study, a new water treatment system that couples (photo-) electrochemical catalysis (PEC or EC) in a microbial fuel cell (MFC) was configured using a stainless-steel (SS) cathode coated with Fe-o/ TiO2. We examined the destruction of methylene blue (MB) and tetracycline. Fe-o/TiO2 was prepared using a chemical reduction-deposition method and coated onto an SS wire mesh (500 mesh) using a sol technique. The anode generates electricity using microbes (bio-anode). Connected via wire and ohmic resistance, the system requires a short reaction time and operates at a low cost by effectively removing 94% MB (initial concentration 20 mg.L-1) and 83% TOC/TOC0 under visible light illumination (50 W; 1.99 mW.cm(-2) for 120 min, MFC-PEC). The removal was similar even without light irradiation (MFC-EC). The E-Eo of the MFC-PEC system was approximately 0.675 kWh.m(-3).order(-1), whereas that of the MFC-EC system was zero. The system was able to remove 70% COD in tetracycline solution (initial tetracycline concentration 100 mg.L-1) after 120 min of visible light illumination; without light, the removal was 15% lower. The destruction of MB and tetracycline in both traditional photocatalysis and photoelectrocatalysis systems was notably low. The electron spin-resonance spectroscopy (ESR) study demonstrated that center dot OH was formed under visible light, and center dot O-2(-) was formed without light. The bio-electricity-activated O-2 and ROS (reactive oxidizing species) generation by Fe-o/TiO2 effectively degraded the pollutants. This cathodic degradation improved the electricity generation by accepting and consuming more electrons from the bio-anode. (C) Higher Education Press and Springer-Verlag Berlin Heidelberg 2016