Chemical Interactions between Nano-ZnO and Nano-TiO2 in a Natural Aqueous Medium

The use of diverse engineered nanomaterials (ENMs) potentially leads to the release of multiple ENMs into the environment. However, previous efforts to understand the behavior and the risks associated with ENMs have focused on only one material at a time. In this study, the chemical interactions bet...

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Veröffentlicht in:	Environmental science & technology 2014-07, Vol.48 (14), p.7924-7932
Hauptverfasser:	Tong, Tiezheng, Fang, Kaiqi, Thomas, Sara A, Kelly, John J, Gray, Kimberly A, Gaillard, Jean-François
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Sprache:	eng
Schlagworte:	Adsorption Applied sciences Biological and physicochemical phenomena Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Environment Exact sciences and technology Lakes - chemistry Michigan Models, Chemical Nanoparticles - chemistry Nanoparticles - ultrastructure Natural water pollution Pollution Pollution, environment geology Solutions Titanium - chemistry Water - chemistry Water treatment and pollution X-Ray Absorption Spectroscopy Zinc - isolation & purification Zinc Oxide - chemistry
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container_title	Environmental science & technology
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creator	Tong, Tiezheng Fang, Kaiqi Thomas, Sara A Kelly, John J Gray, Kimberly A Gaillard, Jean-François
description	The use of diverse engineered nanomaterials (ENMs) potentially leads to the release of multiple ENMs into the environment. However, previous efforts to understand the behavior and the risks associated with ENMs have focused on only one material at a time. In this study, the chemical interactions between two of the most highly used ENMs, nano-TiO2, and nano-ZnO, were examined in a natural water matrix. The fate of nano-ZnO in Lake Michigan water was investigated in the presence of nano-TiO2. Our experiments demonstrate that the combined effects of ZnO dissolution and Zn adsorption onto nano-TiO2 control the concentration of dissolved zinc. X-ray absorption spectroscopy was used to determine the speciation of Zn in the particulate fraction. The spectra show that Zn partitions between nano-ZnO and Zn2+ adsorbed on nano-TiO2. A simple kinetic model is presented to explain the experimental data. It integrates the processes of nano-ZnO dissolution with Zn adsorption onto nano-TiO2 and successfully predicts dissolved Zn concentration in solution. Overall, our results suggest that the fate and toxicity potential of soluble ENMs, such as nano-ZnO, are likely to be influenced by the presence of other stable ENMs, such as nano-TiO2.
doi_str_mv	10.1021/es501168p
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Sci. Technol</addtitle><description>The use of diverse engineered nanomaterials (ENMs) potentially leads to the release of multiple ENMs into the environment. However, previous efforts to understand the behavior and the risks associated with ENMs have focused on only one material at a time. In this study, the chemical interactions between two of the most highly used ENMs, nano-TiO2, and nano-ZnO, were examined in a natural water matrix. The fate of nano-ZnO in Lake Michigan water was investigated in the presence of nano-TiO2. Our experiments demonstrate that the combined effects of ZnO dissolution and Zn adsorption onto nano-TiO2 control the concentration of dissolved zinc. X-ray absorption spectroscopy was used to determine the speciation of Zn in the particulate fraction. The spectra show that Zn partitions between nano-ZnO and Zn2+ adsorbed on nano-TiO2. A simple kinetic model is presented to explain the experimental data. It integrates the processes of nano-ZnO dissolution with Zn adsorption onto nano-TiO2 and successfully predicts dissolved Zn concentration in solution. Overall, our results suggest that the fate and toxicity potential of soluble ENMs, such as nano-ZnO, are likely to be influenced by the presence of other stable ENMs, such as nano-TiO2.</description><subject>Adsorption</subject><subject>Applied sciences</subject><subject>Biological and physicochemical phenomena</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. 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The spectra show that Zn partitions between nano-ZnO and Zn2+ adsorbed on nano-TiO2. A simple kinetic model is presented to explain the experimental data. It integrates the processes of nano-ZnO dissolution with Zn adsorption onto nano-TiO2 and successfully predicts dissolved Zn concentration in solution. Overall, our results suggest that the fate and toxicity potential of soluble ENMs, such as nano-ZnO, are likely to be influenced by the presence of other stable ENMs, such as nano-TiO2.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>24918623</pmid><doi>10.1021/es501168p</doi><tpages>9</tpages></addata></record>
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subjects	Adsorption Applied sciences Biological and physicochemical phenomena Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Environment Exact sciences and technology Lakes - chemistry Michigan Models, Chemical Nanoparticles - chemistry Nanoparticles - ultrastructure Natural water pollution Pollution Pollution, environment geology Solutions Titanium - chemistry Water - chemistry Water treatment and pollution X-Ray Absorption Spectroscopy Zinc - isolation & purification Zinc Oxide - chemistry
title	Chemical Interactions between Nano-ZnO and Nano-TiO2 in a Natural Aqueous Medium
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