Nanoparticles-EPS corona increases the accumulation of heavy metals and biotoxicity of nanoparticles
| Autor: | Xiao-Yan Xu, Taiping Qing, Peng Zhang, Xue-Lin Zhang, Kui Zou, Bing-Zhi Liu, Bo Feng |
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| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
endocrine system Environmental Engineering Health Toxicology and Mutagenesis 0211 other engineering and technologies Nanoparticle 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Corona (optical phenomenon) Adsorption Extracellular polymeric substance Coating Metals Heavy Environmental Chemistry Spectral analysis Waste Management and Disposal health care economics and organizations 0105 earth and related environmental sciences 021110 strategic defence & security studies Chemistry Precipitation (chemistry) Extracellular Polymeric Substance Matrix technology industry and agriculture Heavy metals respiratory system Pollution Chemical engineering engineering Nanoparticles |
| Zdroj: | Journal of hazardous materials. 409 |
| ISSN: | 1873-3336 |
| Popis: | Microbial extracellular polymeric substances (EPS) coating nanoparticles (NPs) surface can form NPs-EPS corona, which significantly affect the adsorption of NPs to toxic substances and alter the ecotoxicological effect of NPs. In this work, the EPS coronas on TiO2 NPs (TNPs) and CeO2 NPs (CNPs) were characterized and the adsorption characteristics of NPs with and without EPS corona to five heavy metals were investigated in single-metal and multiple-metal systems. The results of spectral analysis showed that NPs-EPS corona exhibited new crystalline phases and abundant functional groups. Moreover, 42 and 13 proteins were identified in the TNPs-EPS and CNPs-EPS coronas, respectively. The rates of Cd2+, Pb2+, Cu2+, Ni2+ and Ag+ adsorption by NPs-EPS corona increased to values that were 6.7-7.6, 4.4-5.1, 4.2-5.5, 3.9-4.9 and 8.5-8.8 times those of NPs without EPS corona, respectively, in single-metal system. NPs-EPS coronas are effective in absorbing Ag+, Pb2+ and Cu2+ compared with Cd2+and Ni2+ in multiple metal adsorption. These results indicated that NPs-EPS corona effectively adsorb and remove heavy metals by forming NPs-EPS-metal complexes and inducing precipitation. However, NPs-EPS corona can enhance the toxicity of NPs by accumulating highly-toxic heavy metals in aquatic environments. |
| Databáze: | OpenAIRE |
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