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Formation of organobromine and organoiodine compounds by engineered TiO2 nanoparticle-induced photohalogenation of dissolved organic matter in environmental waters
Hao, Zhineng; Yin, Yongguang; Wang, Juan; Cao, Dong; Liu, Jingfu
2018-08-01
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume631-632Pages:158-168
AbstractThere are increasing concerns about the adverse effects of released engineered nanoparticles and photochemically formed organohalogen compounds (OHCs) on human health and the environment. Herein, we report that titanium dioxide nanoparticles (TiO2 NPs) can photocatalytically halogenate dissolved organic matter (DOM) to form a large number of organobromine compounds (OBCs) and organoiodine compounds (OICs), as characterized by negative ion electrospray ionization coupled with Fourier transform ion cyclotron resonance mass spectrometry. Compared with no OHCs produced in control samples in darkness and/or without TiO2 NPs under sunlight irradiation, various OBCs and OICs were detected in freshwater and seawater under sunlight irradiation for 12 h and 24 h even in the presence of 1 mg L-1 TiO2 NPs, indicating the photocatalytic roles TiO2 NPs played in DOM halogenation. Furthermore, TiO2 NPs could result in the photodegradation of newly formed OHCs, as evidenced by the intensity and the number of some OHCs decreased with reaction time. In addition, many TiO2 NP-induced OBCs contained two or three bromine atoms, and/or nitrogen and sulfur elements, belonging to lignin-like, tannin-like, unsaturated hydrocarbon and aliphatic compounds. While the OICs were primarily contained one iodine, and very few consisted of nitrogen and sulfur elements, most were lignin-like and tannin-like compounds. Finally, the OBCs in freshwater were found to be formed mainly via a substitution reaction or addition reaction and were accompanied by other reactions such as photooxida bon, while the OBCs in seawater and OlCs were formed primarily via substitution reactions. Given the abundance of produced OHCs and their toxicity, our findings call for further studies on the exact structure and toxicity of the formed OHCs, taking account the TiO2 NP-induced DOM photohalogenation in aquatic environments during the evaluation of the environmental effects of engineered TiO2 NPs. (C) 2018 Elsevier B.V. All rights reserved.
Department环境化学与生态毒理学国家重点实验室
KeywordOrganobromine compounds (OBCs) Organoiodine compounds (OICs) Dissolved organic matter (DOM) TiO2 NPs Photohalogenation
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/40948
Collection环境化学与生态毒理学国家重点实验室
Recommended Citation
GB/T 7714
Hao, Zhineng,Yin, Yongguang,Wang, Juan,et al. Formation of organobromine and organoiodine compounds by engineered TiO2 nanoparticle-induced photohalogenation of dissolved organic matter in environmental waters[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,631-632:158-168.
APA Hao, Zhineng,Yin, Yongguang,Wang, Juan,Cao, Dong,&Liu, Jingfu.(2018).Formation of organobromine and organoiodine compounds by engineered TiO2 nanoparticle-induced photohalogenation of dissolved organic matter in environmental waters.SCIENCE OF THE TOTAL ENVIRONMENT,631-632,158-168.
MLA Hao, Zhineng,et al."Formation of organobromine and organoiodine compounds by engineered TiO2 nanoparticle-induced photohalogenation of dissolved organic matter in environmental waters".SCIENCE OF THE TOTAL ENVIRONMENT 631-632(2018):158-168.
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