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Degradation of diiodoacetamide in water by UV/chlorination: Kinetics, efficiency, influence factors and toxicity evaluation
- Source :
- Chemosphere. 240:124761
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- The formation and control of haloacetamides (HAcAms) in drinking water have raised high attention due to their high genotoxicity and cytotoxicity, especially the most cytotoxic one, diiodoacetamide (DIAcAm). In this study, the degradation of DIAcAm by UV/chlorination was investigated in terms of degradation kinetics, efficiency, influencing factors, oxidation products and toxicity evaluation. Results revealed that the degradation of DIAcAm by UV/chlorine process followed pseudo-first-order kinetics, and the rate constant between DIAcAm and OH radicals was determined as 2.8 × 109 M−1 s−1. The contribution of Cl to DIAcAm degradation by UV/chlorine oxidation was negligible. Increasing chlorine dosage and decreasing pH significantly promoted the DIAcAm degradation during UV/chlorine oxidation, but the presence of bicarbonate (HCO3−) and natural organic matter (NOM) inhibited it. The mass balance analysis of iodine species was also evaluated during UV/chlorine oxidation of DIAcAm. In this process, with DIAcAm decreasing from 16.0 to 0.8 μM-I in 20 min, IO3−, I− and HOI/I2 increased from 0 to 6.3, 6.1 and 0.5 μM-I, respectively. The increase of CHO cell viability during DIAcAm degradation indicated that the toxicity of DIAcAm could be decreased by chlorination, UV irradiation and UV/chlorine oxidation treatments, in which UV/chlorine oxidation was more effective on toxicity reduction than chlorination and UV irradiation alone.
- Subjects :
- Environmental Engineering
Halogenation
Ultraviolet Rays
Health, Toxicology and Mutagenesis
Radical
Bicarbonate
0208 environmental biotechnology
Kinetics
chemistry.chemical_element
02 engineering and technology
010501 environmental sciences
Iodine
01 natural sciences
Water Purification
chemistry.chemical_compound
Reaction rate constant
Acetamides
polycyclic compounds
Chlorine
Environmental Chemistry
0105 earth and related environmental sciences
Public Health, Environmental and Occupational Health
Water
General Medicine
General Chemistry
Pollution
020801 environmental engineering
chemistry
Degradation (geology)
Water treatment
Oxidation-Reduction
Water Pollutants, Chemical
Nuclear chemistry
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 240
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....6d68bf20a69b3aa466c1c47fcf1203e1