On the Transport of Stabilized Suspension of Titania and Silica Nanoparticles in Soil Columns Simulating landfill Layers
ELIZABETH MENDES DE OLIVEIRA1; Mara Carolina do Carmo Paresque2; Anderson Vergilio Queiroz2; JOSE ADILSON DE CASTRO3
1 CEFET/RJ; 2 Universidade Federal Fluminense; 3 UFF/VOLTA REDONDA
doi:10.20906/CPS/COB-2015-2269
Resumo
The stability of TiO2 and SiO2 nanoparticles in soil suspensions and their transport behavior through soil columns were studied. The TiO2 nanoparticles acts as a stabilizer of SiO2 nanoparticles suspensions and promotes its transport through the soil columns which simulates the conditions of the controlled landfills layers. The effect of TiO2 nanoparticles into the SiO2 nanoparticles suspensions were studied experimentally and numerically. The experimental apparatus was constructed with 200 mm and 100 mm of height and diameter, respectively. It was observed that both TiO2 and SiO2 were kept in suspensions with negligible nanoparticles clustering and decantation.The experimental and numerical results showed that TiO2 could remain suspended in suspensions even after settling for 10 days. The suspended TiO2 after 24 h is correlated with pH and ionic strength during the percolation of the suspensions in the soil columns. The TiO2 and SiO2 of the outflow of soil columns were strongly affected by the soil pH, organic carbon and clay content of the soils. In this study it was observed that the soil columns behaves as a retention barrier for both TiO2 and SiO2 nanoparticles.
Palavras-chave: Stability; Nanoparticles; Soil columns.