期刊
WATER
卷 14, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/w14071007
关键词
electro-Fenton; Cu-supported stainless steel electrode; nano zero-valent iron-supported biochar; 2-naphthol wastewater
资金
- National key research and development program of China [2016YFC0400702-2]
- National Natural Science Foundation of China [21377041]
- Guangdong Science and Technology Program [2020B121201003]
- Guangdong Suchun Environmental Protection Technology Co. Ltd (Dongguan, China)
A three-dimensional electro-Fenton (3D-EF) system was developed using a nano zero-valent iron-supported biochar (NZVIs-BC) particle electrode and a Cu-supported stainless steel electrode (Cu-SSE), which effectively addressed the drawbacks of the homogeneous electro-Fenton and achieved efficient removal of 2-naphthol while reducing the toxicity of the wastewater.
For the treatment of 2-naphthol wastewater, the homogeneous electro-Fenton process was considered as an effective method but some disadvantages greatly restrict its application. The three-dimensional electro-Fenton (3D-EF) system using a nano zero-valent iron-supported biochar (NZVIs-BC) particle electrode and a Cu-supported stainless steel electrode (Cu-SSE) was proposed to avoid the disadvantages of the homogeneous electro-Fenton. In this work, the 3D-EF system was developed, which consisted of a Cu-SSE (cathode), a graphite rod (anode) and a NZVIs-BC particle electrode. The effect of the ratio of ferrous sulfate heptahydrate (FS) to rice straw (RS), CuSO4 center dot 5H(2)O amount, initial pH of 2-naphthol wastewater and current intensity (the output current of the power supply) on the removal rate of 2-naphthol were investigated. It is noteworthy that more than 98.36% of the 2-naphthol in aqueous solution was removed by the 3D-EF system, and only about 60.09% of 2-naphthol was removed by the homogeneous electro-Fenton system. Furthermore, naphthalene, benzoic acid, beta-naphthoquinone, 1, 2-naphthalenedione, phenol and aromatic hydrocarbon were the main degradation products of 2-naphthol by the 3D-EF system; the toxicity of 2-naphthol wastewater was also greatly reduced.
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