Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127662
Keywords
Reverse osmosis concentrate; Chlorine radical; Three-dimensional Co3O4 nanowires; Electrochemical oxidation
Categories
Funding
- National Natural Science Foundation of China [21875139]
- Shanghai International Science and Technology Cooperation Fund Project [18520744900]
- Yunnan Key Research and Development Program [2018BC001]
- China Postdoctoral Science Foundation [2021M692064]
- Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation
- Center for Advanced Electronic Materials and Devices (AEMD) of Shanghai Jiao Tong University (SJTU)
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An efficient electrochemical system was developed to simultaneously remove total nitrogen and dissolved organic compounds in wastewater reclamation by utilizing chlorine radicals. Co3O4 nanowires outperformed other nanomaterials, achieving high removal rates for NH3-N and DOC in synthetic ROC.
Reverse osmosis concentrate (ROC) from wastewater reclamation has posed significant disposal challenges due to its highly concentrated NH3-N, chloride ion and bio-refractory organics, and developing technologies for their removal are essential. Herein, we developed an efficient electrochemical system to remove total nitrogen and dissolved organic compound (DOC) simultaneously mediated by chlorine radical (Cl center dot), which is generated by activation of chloride ion existing in ROC on an inexpensive, three-dimensional Co3O4 nanowires. Results showed that the total nitrogen and total organic carbon removal were 98.2% and 56.9% in 60 min for synthetic ROC with 56 mg/L of NH3-N and 20 mg/L of DOC. The utilization of Co3O4 nanowires enhanced NH3-N degradation by 2.58 times compared with Co3O4 nanoplates, which were 1.69 and 17.5 times these of RuO2 and Pt. We found that structural Co3+/Co2+ acts as cyclic catalysis to produce Cl center dot via single-electron transfer, which convert NH3-N to N-2 and lead to faster DOC degradation. This architecture provides abundant catalytic sites and sufficient accessibility of reactants. Small amount of nitrate generated by oxidation of NH3-N was further reduced to N-2 on Pd-Cu/NF cathode. These findings provide new insights for utilization of waste Cl and development of novel electrochemical system for ROC disposal.
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