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Multitechnique investigation of the pH dependence of phosphate induced transformations of ZnO nanoparticles.
Environ Sci Technol. 2014 May 06; 48(9):4757-64.ES

Abstract

In order to properly evaluate the ecological and human health risks of ZnO manufactured nanomaterials (MNMs) released to the environment, it is critical to understand the likely transformation products in various environments, such as soils, surface and ground waters, and wastewater treatment processes. To address this knowledge gap, we examined the transformation of 30 nm ZnO MNMs in the presence of different concentrations of phosphate as a function of time and pH using a variety of orthogonal analytical techniques. The data reveal that ZnO MNMs react with phosphate at various concentrations and transform into two distinct morphological/structural phases: a micrometer scale crystalline zinc phosphate phase (hopeite-like) and a nanoscale phase that likely consists of a ZnO core with an amorphous Zn3(PO4)2 shell. The P species composition was also pH dependent, with 82% occurring as hopeite-like P at pH 6 while only 15% occurred as hopeite-like P at pH 8. These results highlight how reactions of ZnO MNMs with phosphate are influenced by environmental variables, including pH, and may ultimately result in structurally and morphologically heterogeneous end products.

Authors+Show Affiliations

Department of Plant and Soil Sciences, University of Kentucky , Lexington, Kentucky 40546-0312, United States.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

24693856

Citation

Rathnayake, Sewwandi, et al. "Multitechnique Investigation of the pH Dependence of Phosphate Induced Transformations of ZnO Nanoparticles." Environmental Science & Technology, vol. 48, no. 9, 2014, pp. 4757-64.
Rathnayake S, Unrine JM, Judy J, et al. Multitechnique investigation of the pH dependence of phosphate induced transformations of ZnO nanoparticles. Environ Sci Technol. 2014;48(9):4757-64.
Rathnayake, S., Unrine, J. M., Judy, J., Miller, A. F., Rao, W., & Bertsch, P. M. (2014). Multitechnique investigation of the pH dependence of phosphate induced transformations of ZnO nanoparticles. Environmental Science & Technology, 48(9), 4757-64. https://doi.org/10.1021/es404544w
Rathnayake S, et al. Multitechnique Investigation of the pH Dependence of Phosphate Induced Transformations of ZnO Nanoparticles. Environ Sci Technol. 2014 May 6;48(9):4757-64. PubMed PMID: 24693856.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multitechnique investigation of the pH dependence of phosphate induced transformations of ZnO nanoparticles. AU - Rathnayake,Sewwandi, AU - Unrine,Jason M, AU - Judy,Jonathan, AU - Miller,Anne-Frances, AU - Rao,William, AU - Bertsch,Paul M, Y1 - 2014/04/09/ PY - 2014/4/4/entrez PY - 2014/4/4/pubmed PY - 2014/10/2/medline SP - 4757 EP - 64 JF - Environmental science & technology JO - Environ Sci Technol VL - 48 IS - 9 N2 - In order to properly evaluate the ecological and human health risks of ZnO manufactured nanomaterials (MNMs) released to the environment, it is critical to understand the likely transformation products in various environments, such as soils, surface and ground waters, and wastewater treatment processes. To address this knowledge gap, we examined the transformation of 30 nm ZnO MNMs in the presence of different concentrations of phosphate as a function of time and pH using a variety of orthogonal analytical techniques. The data reveal that ZnO MNMs react with phosphate at various concentrations and transform into two distinct morphological/structural phases: a micrometer scale crystalline zinc phosphate phase (hopeite-like) and a nanoscale phase that likely consists of a ZnO core with an amorphous Zn3(PO4)2 shell. The P species composition was also pH dependent, with 82% occurring as hopeite-like P at pH 6 while only 15% occurred as hopeite-like P at pH 8. These results highlight how reactions of ZnO MNMs with phosphate are influenced by environmental variables, including pH, and may ultimately result in structurally and morphologically heterogeneous end products. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/24693856/Multitechnique_investigation_of_the_pH_dependence_of_phosphate_induced_transformations_of_ZnO_nanoparticles_ L2 - https://doi.org/10.1021/es404544w DB - PRIME DP - Unbound Medicine ER -