title: Removal of 2-MIB and geosmin by electrogenerated persulfate: Performance, mechanism and pathways.
abstract: In this study, the degradation of 2-methylisoborneol (2-MIB) and geosmin (GSM) was evaluated by electrochemical oxidation (EO) using boron-doped diamond (BDD) electrode. Both 2-MIB and GSM could be degraded efficiently in sulfate electrolyte compared to inert nitrate or perchlorate electrolytes, implying that in-situ generated persulfate may be responsible for contaminants degradation. The observed linear relationship between 2-MIB (GSM) degradation rates and persulfate generation rates further proved that the in-situ generated persulfate enhanced 2-MIB (GSM) degradation. Moreover, a divided electrolytic cell was employed to investigate the effect of cathodic reactions on contaminants degradation and persulfate generation, and results confirmed that both anodic and cathodic reactions participated in 2-MIB (GSM) degradation. High current density and low solution pH were found to be favorable for 2-MIB and GSM degradation. The degradation intermediates were identified and the possible pathways of 2-MIB and GSM degradation were proposed. This study indicated that the EO process with BDD anode could be considered as a potential alternative for the removal of 2-MIB and GSM.
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, PR China.
authors.forename: Lingjun
authors.initials: L
authors.lastname: Bu
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, PR China. Electronic address: shiqingzhouwater@163.com.
authors.forename: Shiqing
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, PR China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Shi
authors.affiliation: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
authors.forename: Naiyun
authors.initials: N
authors.lastname: Gao
mesh_terms: D001895:Boron / Q000737:chemistry; D001892:Camphanes / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D009284:Naphthols / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001892:Camphanes; D009284:Naphthols; D009566:Nitrates; D013431:Sulfates; D014874:Water Pollutants, Chemical; C005536:2-methylisoborneol; D018130:Diamond; C001278:geosmin; D001895:Boron
keywords: Electrochemical oxidation; In-situ generated persulfate; Pathway; Taste & odor compounds