An electrochemical process that uses an Fe-0/TiO2 cathode to degrade typical dyes and antibiotics and a bio-anode that produces electricity

作者：Jiang, Chaojie; Liu, Lifen^*; Crittenden, John C.

来源：Frontiers of Environmental Science and Engineering, 2016, 10(4): 15.

DOI：10.1007/s11783-016-0860-z

• Bio-anode
• Photocatalytic cathode
• Fe-o/TiO2
• ESR
• Dye and antibiotics
• Advanced oxidation

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.

• 出版日期2016-8
• 单位大连理工大学