Degradation products from consumer nanocomposites: a case study on quantum dot lighting.

Environmental Science & Technology
Jingyu LiuRobert H Hurt

Abstract

Most nanomaterials enter the natural environment as nanoenabled products, which are typically composites with primary nanoparticles bound on substrates or embedded in liquid or solid matrices. The environmental risks associated with these products are expected to differ from those associated with the as-produced particles. This article presents a case study on the end-of-life emission of a commercial prototype polymer/quantum-dot (QD) composite used in solid-state lighting for homes. We report the extent of cadmium release upon exposure to a series of environmental and biological simulant fluids, and track the loss of QD-characteristic fluorescence as a marker for chemical damage to the CdSe/ZnS nanoparticles. Measured cadmium releases after 30-day exposure range from 0.007 to 1.2 mg/g of polymer, and the higher values arise for low-pH simulants containing nitric or gastric acid. Centrifugal ultrafiltration and ICP was used to distinguish soluble cadmium from particulate forms. The leachate is found to contain soluble metals with no evidence of free QDs or QD-containing polymeric debris. The absence of free nanoparticles suggests that this product does not raise nanotechnology-specific environmental issues associated with degra...Continue Reading

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Citations

May 23, 2015·Nanotoxicology·Ratna TantraMeike van der Zande
Apr 26, 2017·Integrated Environmental Assessment and Management·Scott LambertMartin Wagner
Dec 9, 2014·ACS Applied Materials & Interfaces·Timothy V Duncan, Karthik Pillai
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Jul 14, 2018·Environmental Science & Technology·Patrick J GrayTimothy V Duncan
Feb 6, 2018·Chemical Reviews·Ankit AgrawalDelia J Milliron

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