Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 341, Issue -, Pages 128-137Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2017.07.014
Keywords
EDTA-Ni; Electro-Fenton; Three-dimensional (3D) macroporous; aerogels (GA)
Categories
Funding
- National Nature Science Foundation of China [21677052]
- Major Science and Technology Program for the Industry Academia -Research Collaborative Innovation [201704020206, 201605122301117]
- Guangdong Province Science and Technology Project [2016B090918104, 2015B020215007, 2015B020235009, 2016B020240005, 2013B090200016]
- Joint fund of Guangdong Province [U1401235]
- State Key Laboratory of Pulp and Paper Engineering [2016C03]
- Zhanjiang of Guangdong Energy Co. [ZY-KJ-YX-2016X085F]
- Guangdong Water Conservancy Science and Technology Innovation Project
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Ethylenediaminetetraacetic acid (EDTA) could form stable complexes with toxic metals such as nickel due to its strong chelation. The three-dimensional (3D) macroporous graphene aerogels (GA), which was in-situ assembled by reduced graphene oxide (rGO) sheets on titanium wire as binder-free electrode, was presented as cathode for the degradation of EDTA-Ni in Electro-Fenton process. The X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and Brunauer-Emmett-Teller (BET) results indicated 3D GA formed three dimensional architecture with large and homogenous macropore structure and surface area. Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV) and Rotating Ring-disk Electrode (RRDE) results showed that the 3D GA cathode at pH 3 displayed the highest current density and electrochemical active surface area (ECSA), and better two electron selectivity for ORR than other pH value, confirming the 3D-GA cathode at pH 3 has the highest electrocatalytic activity and generates more H2O2. The factors such as pH, applied current density, concentration of Fe2+, Na2SO4, and aeration rates of airwere also investigated. Under the optimum conditions, 73.5% of EDTA-Ni was degraded after reaction for 2 h. Mechanism analysis indicated that the production of H-center dot on the 3D GA cathode played an important role in the removal of EDTA-Ni in the 3D GA-EF process, where the direct regeneration of Fe2+ on the cathode would greatly reduce the consumption of H2O2. Therefore, it is of great promise for 3D-GA catalyst to be developed as highly efficient, cost-effective and durable cathode for the removal of EDTA-Ni. (C) 2017 Elsevier B.V. All rights reserved.
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