title: Pd/RGO modified carbon felt cathode for electro-Fenton removing of EDTA-Ni.
abstract: Ethylenediaminetetraacetic acid (EDTA) forms stable complexes with toxic metals such as nickel due to its strong chelation. The electro-Fenton (EF) process using a cathode made from palladium (Pd), reduced graphene oxide (RGO) and carbon felt, fed with air, exhibited high activities and stability for the removal of 10 mg L(-1) EDTA-Ni solution. Pd/RGO catalyst was prepared by one-pot synthesis; the scanning electron microscopy and X-ray diffraction analysis indicated nanoparticles and RGO were well distributed on carbon felt, forming three dimensional architecture with both large macropores and a mesoporous structure. The cyclic voltammetric results showed that the presence of RGO in Pd/RGO/carbon felt significantly increased the current response of two-electron reduction of O2 (0.45 V). The key factors influencing the removal efficiency of EDTA-Ni, such as pH, current and Fe(2+) concentration, were investigated. Under the optimum conditions, the removal efficiency of EDTA-Ni reached 83.8% after 100 min EF treatment. Mechanism analysis indicated that the introduction of RGO in Pd/RGO/carbon felt significantly enhanced the electrocatalytic activities by inducing •OH in the EF process; direct H2O2 oxidation still accounted for a large amount of EDTA-Ni removal efficiency.
authors: The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China E-mail: chenyc@scut.edu.cn.
authors: Zhen
authors: Z
authors: Zhang
authors: The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China E-mail: chenyc@scut.edu.cn.
authors: Junya
authors: J
authors: Zhang
authors: The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China E-mail: chenyc@scut.edu.cn.
authors: Xiaokun
authors: X
authors: Ye
authors: The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China E-mail: chenyc@scut.edu.cn.
authors: Yongyou
authors: Y
authors: Hu
authors: The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China E-mail: chenyc@scut.edu.cn.
authors: Yuancai
authors: Y
authors: Chen
mesh_terms: D002244:Carbon / Q000737:chemistry; D000077482:Carbon Fiber; D002384:Catalysis; D004492:Edetic Acid / Q000737:chemistry*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000077482:Carbon Fiber; C045076:Fenton's reagent; D010087:Oxides; D010165:Palladium; D002244:Carbon; D006108:Graphite; D009532:Nickel; D004492:Edetic Acid; D006861:Hydrogen Peroxide; D007501:Iron