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Transformation of Iodide by Carbon Nanotube Activated Peroxydisulfate and Formation of Iodoorganic Compounds in the Presence of Natural Organic Matter.
Environ Sci Technol. 2017 01 03; 51(1):479-487.ES

Abstract

In this study, we interestingly found that peroxydisulfate (PDS) could be activated by a commercial multiwalled carbon nanotube (CNT) material via a nonradical pathway. Iodide (I-) was quickly and almost completely oxidized to hypoiodous acid (HOI) in the PDS/CNT system over the pH range of 5-9, but the further transformation to iodate (IO3-) was negligible. A kinetic model was proposed, which involved the formation of reactive PDS-CNT complexes, and then their decomposition into sulfate anion (SO42-) via inner electron transfer within the complexes or by competitively reacting with I-. Several influencing factors (e.g., PDS and CNT dosages, and solution pH) on I- oxidation kinetics by this system were evaluated. Humic acid (HA) decreased the oxidation kinetics of I-, probably resulting from its inhibitory effect on the interaction between PDS and CNT to form the reactive complexes. Moreover, adsordable organic iodine compounds (AOI) as well as specific iodoform and iodoacetic acid were appreciably produced in the PDS/CNT/I- system with HA. These results demonstrate the potential risk of producing toxic iodinated organic compounds in the novel PDS/CNT oxidation process developed very recently, which should be taken into consideration before its practical application in water treatment.

Authors+Show Affiliations

State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin, 150090, China.Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology , Harbin 150040, China.School of Civil and Environmental Engineering, Shenzhen Polytechnic , Shenzhen 518055, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin, 150090, China.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

27982571

Citation

Guan, Chaoting, et al. "Transformation of Iodide By Carbon Nanotube Activated Peroxydisulfate and Formation of Iodoorganic Compounds in the Presence of Natural Organic Matter." Environmental Science & Technology, vol. 51, no. 1, 2017, pp. 479-487.
Guan C, Jiang J, Luo C, et al. Transformation of Iodide by Carbon Nanotube Activated Peroxydisulfate and Formation of Iodoorganic Compounds in the Presence of Natural Organic Matter. Environ Sci Technol. 2017;51(1):479-487.
Guan, C., Jiang, J., Luo, C., Pang, S., Jiang, C., Ma, J., Jin, Y., & Li, J. (2017). Transformation of Iodide by Carbon Nanotube Activated Peroxydisulfate and Formation of Iodoorganic Compounds in the Presence of Natural Organic Matter. Environmental Science & Technology, 51(1), 479-487. https://doi.org/10.1021/acs.est.6b04158
Guan C, et al. Transformation of Iodide By Carbon Nanotube Activated Peroxydisulfate and Formation of Iodoorganic Compounds in the Presence of Natural Organic Matter. Environ Sci Technol. 2017 01 3;51(1):479-487. PubMed PMID: 27982571.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Transformation of Iodide by Carbon Nanotube Activated Peroxydisulfate and Formation of Iodoorganic Compounds in the Presence of Natural Organic Matter. AU - Guan,Chaoting, AU - Jiang,Jin, AU - Luo,Congwei, AU - Pang,Suyan, AU - Jiang,Chengchun, AU - Ma,Jun, AU - Jin,Yixin, AU - Li,Juan, Y1 - 2016/12/16/ PY - 2016/12/17/pubmed PY - 2017/6/14/medline PY - 2016/12/17/entrez SP - 479 EP - 487 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 51 IS - 1 N2 - In this study, we interestingly found that peroxydisulfate (PDS) could be activated by a commercial multiwalled carbon nanotube (CNT) material via a nonradical pathway. Iodide (I-) was quickly and almost completely oxidized to hypoiodous acid (HOI) in the PDS/CNT system over the pH range of 5-9, but the further transformation to iodate (IO3-) was negligible. A kinetic model was proposed, which involved the formation of reactive PDS-CNT complexes, and then their decomposition into sulfate anion (SO42-) via inner electron transfer within the complexes or by competitively reacting with I-. Several influencing factors (e.g., PDS and CNT dosages, and solution pH) on I- oxidation kinetics by this system were evaluated. Humic acid (HA) decreased the oxidation kinetics of I-, probably resulting from its inhibitory effect on the interaction between PDS and CNT to form the reactive complexes. Moreover, adsordable organic iodine compounds (AOI) as well as specific iodoform and iodoacetic acid were appreciably produced in the PDS/CNT/I- system with HA. These results demonstrate the potential risk of producing toxic iodinated organic compounds in the novel PDS/CNT oxidation process developed very recently, which should be taken into consideration before its practical application in water treatment. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/27982571/Transformation_of_Iodide_by_Carbon_Nanotube_Activated_Peroxydisulfate_and_Formation_of_Iodoorganic_Compounds_in_the_Presence_of_Natural_Organic_Matter_ L2 - https://dx.doi.org/10.1021/acs.est.6b04158 DB - PRIME DP - Unbound Medicine ER -