Singlet oxygen-dominated non-radical oxidation process for efficient degradation of bisphenol A under high salinity condition.
By Rui Luo, M. Li, Chaohai Wang, Ming Zhang, Muhammad Abdul Nasir Khan, Xiuyun Sun, Jinyou Shen, Weiqing Han, Lianjun Wang, Jiansheng Li. Water Research, 2019
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The degradation of organic contaminants under high salinity condition is still a challenge for environmental remediation due to the inhibiting effect resulted from the side reactions between radicals and anions. Here, we demonstrate the non-radical oxidation process via peroxymonosulfate (PMS) activation by metal-free carbon catalyst for efficiently decomposing bisphenol A (BPA) in saline water. The nitrogen-doped graphitic carbon (NGC700) exhibits excellent catalytic activity for depredating BPA at acid and neutral pH. Based on the scavenger experiments and electron paramagnetic resonance (EPR) analyses, the mechanism of catalytic oxidation was elucidated as the non-radical pathway, and singlet oxygen was identified as the primary reactive species. Experiments on the influence of anions (5-500 mM) further show that the inhibiting effect was overcame due to the non-radical process. Interestingly, Cl- markedly facilitated the catalytic performance by generating HOCl in the catalytic process. The results highlight leveraging the non-radical pathway dominated by singlet oxygen to conquer the inhibitory effect of anions in NGC700/PMS system, which represents a crucial step towards environmental remediation under high salinity condition.
Subfields: Organic Chemistry, Renewable Energy, Sustainability and the Environment, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/bcd5032507c3e7c219c7b3c7e12377e5ded7a8f4
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Citations in the corpus
- Degradation of acetaminophen by activated peroxymonosulfate using Co(OH)2 hollow microsphere supported titanate nanotubes: Insights into sulfate radical production pathway through CoOH+ activation (2021, background): “And more than 30% of ACE could be still degraded due to other oxidation mechanisms produced in the reaction system, such as the non-radical oxidation of singlet oxygen ((1)O2) production and electron transferring [77,78], which was only effective for specific organic pollutants, and more comprehensi”