Investigating the formation of iodinated aromatic disinfection by-products in chlorine/phenol/iodide system
| Autor: | Heng Song, Yanjun Xin, Da-Long Li, Jun Ma, Qinghua Yan, Xiaomin Huang, Xiangrui Pan, Qinghua Chen, Chengzhi Zhou, Guocheng Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Halogenation Iodide chemistry.chemical_element Water Purification Electrophilic substitution chemistry.chemical_compound Human health Reaction rate constant Phenols Chlorine Humans Environmental Chemistry Phenol Organic chemistry Waste Management and Disposal chemistry.chemical_classification Iodides Pollution Quinone Hypoiodous acid Disinfection chemistry Water Pollutants Chemical Disinfectants |
| Zdroj: | Science of The Total Environment. 797:149152 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2021.149152 |
| Popis: | Iodinated disinfection by-products (DBPs) have been attracting great attention due to their potential high toxicity to human health. Understanding of formation mechanisms and transformation process of iodinated aromatic DBPs during the chlorination of iodide-containing water is crucial. Phenol was therefore chosen as a representative of phenolic compounds to investigate the generation of iodinated aromatic DBPs in a chlorine/phenol/iodide system. The presence of iodide in water could enhance the removal of phenol by chlorine due to higher second order rate constants of HOI with phenol than that of HOCl with phenol. Fourteen kinds of iodinated aromatic DBPs were identified, which were generated from oxidation and electrophilic substitution of phenol by HOCl and HOI. Iodinated phenolic DBPs were sources of iodinated quinone DBPs and chlorinated/iodinated phenolic DBPs. Alkaline condition favored the formation of iodinated phenolic DBPs, while acid condition favored the production of iodinated quinone DBPs. Neutral condition might be the most suitable pH condition to control the formation of iodinated aromatic DBPs. The relative concentration of almost all iodinated aromatic DBPs first increased and then decreased with time, indicating iodinated aromatic DBPs might be further converted into halogenated aliphatic DBPs during the chlorination. This research provides a research basis for the removal of phenol in water. |
| Databáze: | OpenAIRE |
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