Impact of Nanoparticle Surface Properties on the Attachment of Cerium Oxide Nanoparticles to Sand and Kaolin.
作者： Weilan Zhang , Arthur P. Schwab , Jason C. White , Xingmao Ma
关键词:
摘要: Soil texture has been found to be a critical factor in regulating the fate and transport of cerium oxide nanoparticles (CeONPs) terrestrial environment. However, underlying mechanisms for interactions between CeONPs different components soil are still poorly understood. The attachment onto two typical (sand kaolin) batch experiments were investigated provide insights into retention bioavailability soil. Surface properties CeONPs, including surface charge coating condition, had strong impacts on particles. Positively charged [CeONPs(+)] displayed greatest kaolin, whereas negatively [CeONPs(-)] showed poorest sand. kaolin was significantly greater than sand, irrespective charge. Homoaggregation increased size sand kaolin. Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) calculations agreed with experimental observations that condition played vital role homoaggregation adsorption CeONPs. For CeONPs(-) coated polyvinylpyrrolidone (PVP), steric repulsion particles increases rapidly increase maximum concentration PVP. Adsorption isothermal fittings indicated can properly described by Dubinin-Radushkevich isotherm. results obtained this study crucial understanding engineered nanomaterials
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