Abstract
Halobenzoquinones (HBQs) are emerging toxic disinfection byproducts in water. Development of effective methods to decompose or remove HBQs from water is imperative. Herein, we report the exploration of a metal-organic framework ZIF-8 as an effective catalysis of the transformation and removal of HBQs in darkness. Three HBQs (2,6-dichloro-1,4-benzoquinone (DCBQ), 2,6-dibromo-1,4-benzoquinone (DBBQ) and tetrachloro-1,4-benzoquinone (TCBQ)) were taken as examples and main degradation product of HBQs was studied. In the presence of ZIF-8, 90 % of the HBQs transformed in <10 min and the transformation followed pseudo-first-order kinetics with large reaction rate constants of 0.163–0.181 min−1. ZIF-8 further made the major transformation product OH-HBQs disappear completely within the following 24 h. In addition, >80 % of ZIF-8 initial activity was maintained after 4 cycles. Radical and holes inhibition experiments verified that the holes in ZIF-8 dominated HBQs hydroxylation. Except for OH-HBQ, several other possible products were found and all of them were predicted as less toxic than their parent compound. This study offers a potential approach for HBQs removal from disinfected waters.
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