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Interaction of carbonaceous nanomaterials with wastewater biomass

Frontiers of Environmental Science & Engineering 2015年第5期9卷 823-831页

作者： Yu YANG Zhicheng YU Takayuki NOSAKA kyle doudrick Kiril HRISTOVSKI Pierre HERCKES Paul WESTERHOFF School of Sustainable Engineering and the Built Environment Arizona State University Tempe AZ 85287 USA School for Engineering of Matter Transport and Energy Arizona State University Tempe AZ 85287 USA Department of Civil and Environmental Engineering and Earth Sciences University of Notre Dame Notre Dame IN 46556 USA The Polytechnic School Arizona State University Mesa AZ 85212 USA Department of Chemistry and Biochemistry Arizona State University Tempe AZ 85287 USA

Increasing production and use of carbonaceous nanomaterials （NMs） will increase their release to the sewer system and to municipal wastewater treatment plants. There is little quantitative knowledge on the removal of multi-walled carbon nanotubes （MWCNTs）, graphene oxide （GO）, or few-layer graphene （FLG） from wastewater into the wastewater biomass. As such, we investigated the quantification of GO and MWCNTs by UV-Vis spectrophotometry, and FLG using programmable thermal analysis （PTA）, respectively. We further explored the removal of pristine and oxidized MWCNTs （O- MWCNTs）, GO, and FLG in a biomass suspension. At least 96% of pristine and O-MWCNTs were removed from the water phase through aggregation and 30-min settling in presence or absence of biomass with an initial MWCNT concentration of 25mg.L-1. Only 65% of GO was removed with biomass concentration at or above 1,000 mg. L-1 as total suspended solids （TSS） with the initial GO concentration of 25 mg. L-1. As UV-Vis spectrophotometry does not work well on quantification of FLG, we studied the removal of FLG at a lower biomass concentration （50mg TSS-L-1） using PTA, which showed a 16% removal of FLG with an initial concentration of 1 mg ·L-1. The removal data for GO and FLG were fitted using the Freundlich equation （R2 = 0.55, 0.94, respectively）. The data presented in this study for carbonaceous NM removal from wastewater provides quantitative informa- tion for environmental exposure modeling and life cycle assessment.

关键词： multi-walled carbon nanotubes graphene oxide graphene removal wastewater biomass

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