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. 2015 Oct 16;20(10):18847–18855. doi: 10.3390/molecules201018847

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© 2015 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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The amount of generated (a) CH₄ and (b) CO as a function of irradiation time over the sample of MEA–ZnO or clean ZnO. Control experiments without light irradiation (control 1) or without CO₂ (control 2) showed no generation of CO and CH₄.