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release of ZrO2 nanoparticles from ZrO2/Polymer nanocomposite in wastewater treatment processes

Journal of environmental Sciences 2020年第5期32卷 85-91页

作者： Liteng Hao Xiaoxia Zhou Jingfu Liu Hubei Key Laboratory of environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China State Key Laboratory of environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The widespread use of nano-enabled water treatment composites(NWTCs)can result in the release of nanoparticles(NPs)into environmental *** the release of NPs from NWTCs is of great significance for evaluating the material stability,and environment and biological *** work evaluated the amount and species of Zr released from a NWTC,a ZrO2/polymer composite(HZO@D201),during the treatment of electroplating *** 5 g of the HZO@D201 particles,consisting of porous spheres(0.8 mm in diameter)loaded with ZrO2 NPs,were packed into a glass column(130 mm in length and20 mm in diameter)and treated with wastewater at a flow rate of 25 mL/*** release of Zr occurred mainly in the initial stages of water treatment,decreased with the increase of treatment volume,and approached an equilibrium value of approximately 3.79μg/L at the treatment volume of about 800 bed *** total amount of Zr released in the effluent was in the range of 2.62-140μg/L,which was mainly present in the form of ZrO2 *** amounts of Zr released under acidic and alkaline conditions were markedly higher than that under neutral conditions,while the presence of humic acid significantly inhibited the release of *** study implied that the NWTCs could be a source of engineered NPs in environmental waters,and should be considered in evaluating the safety of ZrO2/polymer composites in water treatment.

关键词： Water treatment Nanocomposite Zirconia nanoparticles environmental release

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Integration of production and use information into an exposure-based screening approach to rank chemicals of emerging Arctic concern for potential to be planetary boundary threats

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Emerging Contaminants 2021年第1期7卷 213-218页

作者： Marta Plaza-Hernandez Juliette Legler Matthew MacLeod Brunel University London Department of Life SciencesUK Utrecht University Institute for Risk Assessment SciencesNetherlands Stockholm University Department of Environmental ScienceSweden

Planetary boundaries delimit a‘safe operating space for humanity’that should not be overstepped to maintain stable Holocene-like conditions on *** chemical pollutants have the potential to pose a planetary boundary threat to the functioning of vital Earth system processes as so-called‘novel entities’.Recently,an exposure-based prioritization scheme was developed that uses model-estimated data on persistence and degree of mobility in air and water to identify and prioritise chemical substances that may be planetary boundary *** a case study,chemicals of emerging Arctic concern identified by the Arctic Monitoring and Assessment Programme(AMAP)were used to develop the *** exposure-based prioritization scheme cannot address all scenarios for a chemical to pose an unknown planetary boundary threat,but it does allow for prioritization of chemicals according to environmental fate and exposure profiles.A key limitation of the scheme is that the quantity of chemical potentially released to the environment was not considered in the ***,we use data on chemical production and use reported under the European chemicals regulation REACH,and an emission scoring system developed by the European Food Safety Authority(EFSA)to attempt to add information about estimated emissions to the exposure-based prioritization *** REACH data and the EFSA scoring system,we ranked the AMAP substances according to their potential for environmental release and combined that information with the previously reported exposure-based prioritization that considers persistence and long-range transport *** method successfully assigned‘high priority’to known ozone-depleting substances(methyl chloride and dichloromethane)and identified chemicals of concern recently under consideration for nomination as persistent organic pollutants under the Stockholm Convention(octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane).The EFSA scoring system offers a

关键词： Arctic contaminants AMAP environmental release Planetary boundary threats Exposure-based hazard profiles REACH

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