Tags

Type your tag names separated by a space and hit enter

Kinetics and model development of iohexol degradation during UV/H2O2 and UV/S2O82- oxidation.
Chemosphere. 2019 Aug; 229:602-610.C

Abstract

The degradation rates and kinetics of one commonly used iodinated contrast medium, iohexol, were investigated and compared during ultraviolet (UV) photolysis, UV/H2O2 and UV/S2O82- advanced oxidation processes (AOPs). Results indicate that the iohexol degradation rate increased in the order of UV/H2O2 < UV irradiation < UV/S2O82- and followed pseudo-first-order kinetics. Increasing persulfate concentration significantly increased iohexol degradation rate, whereas increasing H2O2 concentration caused reverse effect. Radical scavenging test results show that UV photolysis, OH and radicals all contributed to iohexol degradation during UV/S2O82-, but OH was the main contributor during UV/H2O2 and was consumed by excess H2O2. The kinetic models of iohexol degradation by both AOPs were developed, and the reaction rate constants with OH and were calculated as 5.73 (±0.02) × 108 and 3.91 (±0.01) × 1010 M-1 s-1, respectively. Iohexol degradation rate remained stable at pH 5-9 during UV irradiation and UV/H2O2, but gradually decreased at pH 5-7 and remained stable at pH 7-9 during UV/S2O82-. The presence of anions displayed inhibitory effects on iohexol degradation during UV/S2O82- in the order of Cl- >HCO3- ≫ SO42-. UV/S2O82- AOP exhibited high degradation efficiency and stability on the basis of UV irradiation, which can be applied as a promising degradation method for iohexol. UV/S2O82- AOP can effectively mineralize iohexol to CO2 but promoted the generation of toxic iodoform (CHI3), and the subsequent chlorination had the potential to reduce the content of disinfection by-products; therefore, further evaluation of possible environmental hazards is warranted.

Authors+Show Affiliations

College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy- Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, 200090, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy- Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, 200090, PR China.Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan, ROC. Electronic address: yililin@nkust.edu.tw.College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy- Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, 200090, PR China.College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy- Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, 200090, PR China.College of Environmental and Chemical Engineering, Shanghai Engineering Research Center of Energy- Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai, 200090, PR China.Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 81157, Taiwan, ROC.Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 80778, Taiwan, ROC.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31100631

Citation

Hu, Chen-Yan, et al. "Kinetics and Model Development of Iohexol Degradation During UV/H2O2 and UV/S2O82- Oxidation." Chemosphere, vol. 229, 2019, pp. 602-610.
Hu CY, Hou YZ, Lin YL, et al. Kinetics and model development of iohexol degradation during UV/H2O2 and UV/S2O82- oxidation. Chemosphere. 2019;229:602-610.
Hu, C. Y., Hou, Y. Z., Lin, Y. L., Deng, Y. G., Hua, S. J., Du, Y. F., Chen, C. W., & Wu, C. H. (2019). Kinetics and model development of iohexol degradation during UV/H2O2 and UV/S2O82- oxidation. Chemosphere, 229, 602-610. https://doi.org/10.1016/j.chemosphere.2019.05.012
Hu CY, et al. Kinetics and Model Development of Iohexol Degradation During UV/H2O2 and UV/S2O82- Oxidation. Chemosphere. 2019;229:602-610. PubMed PMID: 31100631.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics and model development of iohexol degradation during UV/H2O2 and UV/S2O82- oxidation. AU - Hu,Chen-Yan, AU - Hou,Yuan-Zhang, AU - Lin,Yi-Li, AU - Deng,Yan-Guo, AU - Hua,Shuang-Jing, AU - Du,Yi-Fan, AU - Chen,Chiu-Wen, AU - Wu,Chung-Hsin, Y1 - 2019/05/03/ PY - 2019/02/12/received PY - 2019/04/15/revised PY - 2019/05/02/accepted PY - 2019/5/18/pubmed PY - 2019/8/6/medline PY - 2019/5/18/entrez KW - Hydroxyl and sulfate radicals KW - Iodinated X-ray contrast media (ICM) KW - Kinetics KW - UV/ KW - UV/H(2)O(2) SP - 602 EP - 610 JF - Chemosphere JO - Chemosphere VL - 229 N2 - The degradation rates and kinetics of one commonly used iodinated contrast medium, iohexol, were investigated and compared during ultraviolet (UV) photolysis, UV/H2O2 and UV/S2O82- advanced oxidation processes (AOPs). Results indicate that the iohexol degradation rate increased in the order of UV/H2O2 < UV irradiation < UV/S2O82- and followed pseudo-first-order kinetics. Increasing persulfate concentration significantly increased iohexol degradation rate, whereas increasing H2O2 concentration caused reverse effect. Radical scavenging test results show that UV photolysis, OH and radicals all contributed to iohexol degradation during UV/S2O82-, but OH was the main contributor during UV/H2O2 and was consumed by excess H2O2. The kinetic models of iohexol degradation by both AOPs were developed, and the reaction rate constants with OH and were calculated as 5.73 (±0.02) × 108 and 3.91 (±0.01) × 1010 M-1 s-1, respectively. Iohexol degradation rate remained stable at pH 5-9 during UV irradiation and UV/H2O2, but gradually decreased at pH 5-7 and remained stable at pH 7-9 during UV/S2O82-. The presence of anions displayed inhibitory effects on iohexol degradation during UV/S2O82- in the order of Cl- >HCO3- ≫ SO42-. UV/S2O82- AOP exhibited high degradation efficiency and stability on the basis of UV irradiation, which can be applied as a promising degradation method for iohexol. UV/S2O82- AOP can effectively mineralize iohexol to CO2 but promoted the generation of toxic iodoform (CHI3), and the subsequent chlorination had the potential to reduce the content of disinfection by-products; therefore, further evaluation of possible environmental hazards is warranted. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/31100631/Kinetics_and_model_development_of_iohexol_degradation_during_UV/H2O2_and_UV/S2O82__oxidation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)30908-7 DB - PRIME DP - Unbound Medicine ER -