Journal article
Sunlight affects aggregation and deposition of graphene oxide in the aquatic environment
Water research (Oxford), Vol.78, pp.37-46
07/01/2015
Handle:
https://hdl.handle.net/2376/110684
PMID: 25898251
Abstract
In this study, we investigate the role of simulated sunlight on the physicochemical properties, aggregation, and deposition of graphene oxide (GO) in aquatic environments. Results show that light exposure under varied environmental conditions significantly impacts the physicochemical properties and aggregation/deposition behaviors of GO. Photo-transformation has negligible effects on GO surface charge, however, GO aggregation rates increase with irradiation time for direct photo-transformation under both aerobic and anaerobic conditions. Under anaerobic conditions, photo-reduced GO has a greater tendency to form aggregates than under aerobic conditions. Aggregation of photo-transformed GO is notably influenced by ion valence, with higher aggregation found in the presence of divalent ions versus monovalent, but adding natural organic matter (NOM) reduces it. QCM-D studies show that deposition of GO on surfaces coated with organic matter decreases with increased GO irradiation time, indicating a potential increase in GO mobility due to photo-transformation. General deposition trends on Suwannee River Humic Acid (SRHA)-coated surfaces are control GO > aerobically photo-transformed GO ≈ anaerobically photo-transformed GO. The release of deposited GO from SRHA-coated surfaces decreases with increased irradiation time, indicating that photo-transformed GO is strongly attached to the NOM-coated surface.
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•Aggregation and deposition of graphene oxide (GO) can be significantly influenced by sunlight.•Sunlight exposure can increase aggregation of GO.•Photo-transformation can reduce deposition of GO on natural organic matter surface.•Aggregation and deposition of GO is a function of oxygen level during photo-transformation.•Remobilization of deposited GO from surfaces can be reduced due to photo-transformation.
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Details
- Title
- Sunlight affects aggregation and deposition of graphene oxide in the aquatic environment
- Creators
- Indranil Chowdhury - National Research Council Associate, National Exposure Research Laboratory, Ecosystems Research Division, U. S. Environmental Protection Agency, Athens, GA 30605, USAWen-Che Hou - National Research Council Associate, National Exposure Research Laboratory, Ecosystems Research Division, U. S. Environmental Protection Agency, Athens, GA 30605, USADavid Goodwin - Department of Chemistry, Johns Hopkins University, Baltimore, MD, USAMatthew Henderson - National Exposure Research Laboratory, Ecosystems Research Division, U. S. Environmental Protection Agency, Athens, GA 30605, USARichard G Zepp - National Exposure Research Laboratory, Ecosystems Research Division, U. S. Environmental Protection Agency, Athens, GA 30605, USADermont Bouchard - National Exposure Research Laboratory, Ecosystems Research Division, U. S. Environmental Protection Agency, Athens, GA 30605, USA
- Publication Details
- Water research (Oxford), Vol.78, pp.37-46
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900547379201842
- Language
- English
- Resource Type
- Journal article