Colloidal stabilities and deposition behaviors of chromium (hydr)oxides in the presence of dissolved organic matters: role of coprecipitation and adsorption

Abstract

The coprecipitation or surface adsorption of dissolved organic matters determined the colloidal stabilities and deposition behaviors of Cr (hydr)oxides.

Heterogeneous Coprecipitation of Nanocrystals with Metals on Substrates

“…Recent studies of homogeneous Fe/Cr hydroxide coprecipitation with dissolved organic matter (DOM) 47−49 revealed complex interactions between Fe/Cr ions and hydroxide particles with OM: OMs' affinity for complexing with Fe/Cr ions or hydroxides controlled the amounts of OM and Cr sequestrated in the Fe/Cr-OM coprecipitates, and carboxyl/ amine functional groups in OMs were reported with strong binding abilities for Cr(III). 47,50 Our recent work found the preferential adsorption of SRNOM onto Al 2 O 3 rather than SiO 2 . With little SRNOM adsorption onto SiO 2 , the heterogeneous precipitation of (Fe, Cr)(OH) 3 on bare and SRNOM-coated SiO 2 exhibited no significant difference.…”