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Zhang C.,Key Laboratory of Pollution Process and Environmental Criteria | Zhang C.,Nankai University | Zhou L.,Key Laboratory of Pollution Process and Environmental Criteria | Zhou L.,Nankai University | And 7 more authors.
Environmental Science and Pollution Research | Year: 2014

In the present work, nanoscale zero-valent iron/activated carbon (NZVI/AC) was investigated as heterogeneous Fenton catalyst in three-dimensional (3D) electrode system for methyl orange (MO) degradation. Some important operating parameters such as cathodic potential, pH, and O2 flow rate were investigated, exhibiting good decolorization. The mineralization of MO was significantly improved by 20-35 % compared to two-dimensional (2D) AC system at the optimum conditions. Although the TOC removal of AC was higher than NZVI/AC due to its good adsorption capacity initially, heterogeneous Fenton catalysis played a more and more important roles in the following test. After eight runs, NZVI/AC still exhibited excellent catalytic properties with low iron leaching. Further, a relatively comprehensive mechanism of NZVI/AC as particle electrodes in 3D system was proposed. © 2014 Springer-Verlag Berlin Heidelberg. Source

Yang J.,Key Laboratory of Pollution Process and Environmental Criteria | Yang J.,Nankai University | Zhou M.,Key Laboratory of Pollution Process and Environmental Criteria | Zhou M.,Nankai University | And 4 more authors.
Bioprocess and Biosystems Engineering | Year: 2016

This work studied a cost-effective electrosorption that driven by microbial fuel cells (MFC-sorption) to remove Cu2+ from wastewater without an external energy supply. The impact factors, adsorption isotherms and kinetics of the novel process were investigated. It indicated that a low electrolyte concentration and a high solution pH could enhance the Cu2+ removal efficiency, while the adsorption capacity increased with the increase of numbers of MFCs in series and the initial Cu2+ concentration. The adsorption isotherms study indicated that the monolayer adsorption in MFC-sorption was dominant. The kinetics study suggested the increase of initial Cu2+ concentration could enhance the initial adsorption rate. The electrode characterizations verified the existence of Cu2O and Cu on the electrode surface of active carbon fibers (ACFs), suggesting that MFC-sorption was not only an adsorption process, but also a redox reaction process. © 2016 Springer-Verlag Berlin Heidelberg. Source

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