title: Nanoscale zero-valent iron/AC as heterogeneous Fenton catalysts in three-dimensional electrode system.
abstract: 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.
authors.affiliation: Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.forename: Xinmin
authors.initials: X
authors.lastname: Yu
authors.forename: Yonghai
authors.initials: Y
authors.lastname: Jiang
authors.forename: Minghua
authors.initials: M
authors.lastname: Zhou
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; C100258:methyl orange; D002244:Carbon; D007501:Iron