title: Highly efficient electro-generation of hydrogen peroxide using NCNT/NF/CNT air diffusion electrode for electro-Fenton degradation of p-nitrophenol.
abstract: To promote the in situ generation of hydrogen peroxide (H2O2) in electro-Fenton system, a new air diffusion electrode (ADE) was put forward in the present work using N-doped multi-walled carbon nanotubes (NCNT) as the catalyst layer, multi-walled carbon nanotubes (CNT) as the diffusion layer, and nickel foam (NF) as the supporting material, respectively. The catalyst layer in ADE was characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. Then the performances of H2O2 accumulation and p-nitrophenol (p-NP) degradation with the electrode (NCNT/NF/CNT ADE) were investigated. The experimental results showed that H2O2 accumulation on the NCNT/NF/CNT ADE was greatly improved by the presence of N doping, and H2O2 accumulation concentration could reach 307 mg L(-1) after 120 min at the current intensity of 100 mA. Moreover, the NCNT/NF/CNT ADE presented more effective performance on p-NP degradation than the CNT/NF/CNT ADE or the NF ADE. p-NP of initial 50 mg L(-1) could be almost completely removed after 30 min, and the total organic carbon removal efficiency reached 62.61% after 120 min when 0.4 mM Fe(2+) was added into the system. The repeatability test suggested that the stability of the NCNT/NF/CNT ADE was very good.
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: xiaoxi327@163.com; College of Environmental Science and Engineering, Jilin Normal University, Siping 136000, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Tang
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: xiaoxi327@163.com.
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: xiaoxi327@163.com.
authors.forename: D M
authors.initials: DM
authors.lastname: Yao
authors.affiliation: College of Environmental Science and Engineering, Jilin Normal University, Siping 136000, China.
authors.forename: C W
authors.initials: CW
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: xiaoxi327@163.com.
authors.forename: Y C
authors.initials: YC
authors.lastname: Sun
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification
chemical_list: D037742:Nanotubes, Carbon; D009596:Nitrophenols; D014874:Water Pollutants, Chemical; D009532:Nickel; D006861:Hydrogen Peroxide; C024836:4-nitrophenol