Study on Removal of 1,3,6,8-Tetrabromocarbazole by Transition Metal-Activated Sulfite Systems
YI Wenyu
DING Jiaqi
HUANG Xiaolong
XIE Pengchao
WANG Zongping
Abstract：In this study,1,3,6,8-tetrabromocarbazole(1,3,6,8-BCZ),a frequently detected chemical in the environment,was selected as a typical brominated pollutant to explore the removal efficiency and mechanism by transition metal/sulfite system.The results showed that both Fe(Ⅲ)/sulfite and Fe(Ⅱ)/sulfite system could effectively remove 1,3,6,8-BCZ,and the removal efficiencies of 1,3,6,8-BCZ were 65.7％and 53.9％respectively after reaction for 5 min,which could be improved by the increasing concentration of metal ions and sulfite.The elevation of solution pH could also enhance the removal of 1,3,6,8-BCZ,and Cu(Ⅱ)/sulfite system could remove part of 1,.3,6,8-BCZ at pH 7.The presence of humic acid in water sig-nificantly inhibited the removal of 1,3,6,8-BCZ by Fe(Ⅲ)/sulfite and Fe(Ⅱ)/sulfite system,while HCO3-had no significant ef-fect.Quenching experiments and EPR detection proved the presence of free radicals in Fe(Ⅲ)/sulfite system,which played a part role in the removal of 1,3,6,8-BCZ,and metal ion flocculation precipitation owned the main contribution for 1,3,6,8-BCZ removal.Based on the detected intermediate products from GC-MS and density functional theory analysis,it is inferred that the C-N bond breaking and the debromination or substitution of carbon atoms on benzene ring occurred in the degrada-tion process of 1,3,6,8-BCZ.
Keywords：transition metalsulfite1368-tetrabromocarbazoleadvanced oxidation processsulfate radical
Publication Date：2023-08-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 164-172 )