Preparation of transition metal composite graphite felt cathode for efficient heterogeneous electro-Fenton process.
A composite graphite felt (GF) modified with transition metal was fabricated and used as cathode in heterogeneous electro-Fenton (EF) for methyl orange (MO) degradation. Characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), the morphology and surface physicochemical properties of the cathodes after modification were observed considerably changed. After loading metals, the current response became higher, the accumulation of H2O2and the degradation efficiency of MO were improved. Under the same conditions, GF-Co had the highest catalytic activity for electro-reduction of O2to H2O2and MO degradation. At pH 3, 99 % of MO degradation efficiency was obtained using GF-Co after 120 min treatment and even at initial pH 9, 82 % of that was obtained. TOC removal efficiency reached 93.8 % using GF-Co at pH 3 after 120 min treatment while that was 12.3 % using GF. After ten-time runs, the mineralization ratio of the GF-Co was still 89.5 %, suggesting that GF-Co was very promising for wastewater treatment. The addition of isopropanol proved that·OH played an important role in degradation of MO.
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin, China.|Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Liang
L
Liang
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin, China.|Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Fangke
F
Yu
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin, China.|Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Yiran
Y
An
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin, China.|Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Mengmeng
M
Liu
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin, China. zhoumh@nankai.edu.cn.|Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China. zhoumh@nankai.edu.cn.
Minghua
M
Zhou
D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D004563:Electrochemistry; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D028561:Transition Elements / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D001391:Azo Compounds; D006108:Graphite; D006861:Hydrogen Peroxide; D007501:Iron; D028561:Transition Elements; D062065:Wastewater; C045076:Fenton's reagent; C100258:methyl orange
Graphite felt; Heterogeneous electro-Fenton; Hydroxyl radical; Methyl orange; Transition metals