Journal
CHEMICAL ENGINEERING JOURNAL
Volume 381, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122634
Keywords
Peroxymonosulfate; Halide ions; Halogenated by-products; AOX
Categories
Funding
- National Key Research and Development Program of China [2016YFC0400501]
- National Natural Science Foundation of China (NSFC) [21677031]
- Graduate Student Innovation Fund of Donghua University [GSIF-DH-M-2019006]
- Shanghai Sailing Program [18YF1429900]
- Cultivate discipline fund of Shanghai Polytechnic University [XXKPY1601]
- Graduate Student Funding Program of Shanghai Polytechnic University [A01GY17F022-g02]
- Shanghai Polytechnic University Leap Program [EGD18XQD24]
- Gaoyuan Discipline of Shanghai-Environmental Science and Engineering (Resource Recycling Science and Engineering)
Ask authors/readers for more resources
Transformation of halogenated organics in advanced oxidation processes (AOPs) have been extensively investigated, however, there is little information about the fate of polyhalogenated pollutants (-Cl, -Br coexist) particularly while exogenic halides (X-, Cl- or Br-) are present. Herein, the oxidation of isomeric compounds of 2-bromo-4-chlorophenol (2-Br-4-CP) and 2-chloro-4-bromophenol (2-Cl-4-BP) were comparatively investigated in the presence of peroxymonosulfate (PMS) and various concentrations of exogenic Cl- or Br-. Both 2-Br-4-CP and 2-Cl-4-BP could be efficiently degraded and gradually mineralized in the PMS/X- systems. Based on Gas Chromatography-Mass Spectrometer (GC-MS) data, different chlorinated products and brominated products were identified in the PMS/X- systems during the degradation of two compounds. The release of endogenic X was determined by the initial level of exogenic X-, where the low initial exogenic X- resulted in a high AOX accumulation. Endogenic halogen seems more liable to release in PMS/Br- system than PMS/X- system. The faster degradation rate and higher mineralization degree of 2-Br-4-CP than 2-Cl-4-BP were successfully predicted by frontier orbital theory and mulliken atomic charge distribution. The importance of the position of halogen atoms on dehalogenation, halogenation and degradation processes is emphasized. These findings also demonstrate the necessity of 1) monitoring the X- levels in wastewater prior to application of PMS-based oxidation processes and 2) precise identification of halogen position in byproducts analysis for predicting their fates.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available