Advanced reduction process to achieve efficient degradation of pyridine

Shuhao Liu; Jinglong Han; Yangcheng Ding; Xiaoxu Gao; Haoyi Cheng; Hongcheng Wang; Chunshuang Liu; Aijie Wang

doi:10.1016/j.chemosphere.2021.132240

Advanced reduction process to achieve efficient degradation of pyridine

Chemosphere. 2022 Jan;287(Pt 3):132240. doi: 10.1016/j.chemosphere.2021.132240. Epub 2021 Sep 14.

Authors

Shuhao Liu¹, Jinglong Han², Yangcheng Ding³, Xiaoxu Gao⁴, Haoyi Cheng⁵, Hongcheng Wang⁵, Chunshuang Liu⁶, Aijie Wang⁷

Affiliations

¹ CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
² State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China. Electronic address: hanjinglong@yeah.net.
³ CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China.
⁴ School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang, 110870, PR China.
⁵ State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
⁶ College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, PR China.
⁷ CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China. Electronic address: ajwang@rcees.ac.cn.

PMID: 34543903
DOI: 10.1016/j.chemosphere.2021.132240

Abstract

Pyridine and its derivatives are widely consumed and detected in the environment persistently, which can cause potential adverse impacts on environment and human health. Considering the fact that pyridine could absorb UV light at 254 nm to generate excited one, which could react with reductive radicals, promoting its structural changes, we proposed that one typical efficient advanced reduction process (ARP) which combines UV irradiation with sulfite could be used to eliminate pyridine quickly. Sulfite/UV process showed a higher pyridine removal rate with a pseudo-first-order reaction rate constant of 0.1439 min^-1, which was 3 times of that in UV irradiation and 1.3 times in UV/H₂O₂ process. This was primarily due to reductive radicals (e_aq^-, H^• and SO₃^•-) produced by UV irradiation. The removal rate of pyridine was highest in slightly alkaline environment. And the presence of oxygen, as well as certain concentration of humid acid just showed slight inhibition, indicating the possibility of application in practical environment. A positive impact was observed with increasing sulfite dosage, but it was gradually inhabited when the dosage was over 5 mM. The present study may provide an alternative efficient technology for the degradation of pyridine ring-containing substances.

Keywords: Advanced reduction process; Degradation mechanism; Pyridine; Reductive radicals; Sulfite/UV.

MeSH terms

Humans
Hydrogen Peroxide
Oxidation-Reduction
Pyridines
Ultraviolet Rays
Water Pollutants, Chemical* / analysis
Water Purification*

Substances

Pyridines
Water Pollutants, Chemical
Hydrogen Peroxide