Role of solution chemistry in the retention and release of graphene oxide nanomaterials in uncoated and iron oxide-coated sand.

ABSTRACT: Understanding the fate and transport including remobilization of graphene oxide nanomaterials (GONMs) in the subsurface would enable us to expedite their benign use and evaluate their environmental impacts and health risks. In this study, the retention and release of GONMs were investigated in water-saturated columns packed with uncoated sand (Un-S) or iron oxide-coated sand (FeS) at environmentally relevant solution chemistries (1-100mM KCl and 0.1-10mM CaCl₂ at pH7 and 11). Our results showed that increasing ionic strength (IS) inhibited GONMs' transport, and the impact of K⁺ was less than Ca²⁺. The positively charged iron oxide coating on sand surfaces immobilized the negatively charged GONMs (pH7) in the primary minimum, yielding hyperexponential retent

SUBMITTER: Wang D 

PROVIDER: S-EPMC7372574 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature