Hydrous zirconium oxide (ZrO 2̇xH 2O) were synthesized by a low-cost hydrothermal process followed with heat treatment. ZrO 2·xH 2O nanoparticles ranged from 6 nm to 10 nm and formed highly porous aggregates, resulting in a large surface area of 161.8 m 2 g -1. The batch tests on the laboratory water samples demonstrated a very high degree of As(III) and As(V) removal by ZrO 2̇xH 2O nanoparticles. The adsorption mechanism study demonstrated that both arsenic species form inner-sphere surface complexes on the surface of ZrO 2̇xH 2O nanoparticles. Higher arsenic removal effect of these ZrO 2̇xH 2O nanoparticles were demonstrated, compared with commercially available Al 2O 3 and TiO 2 nanoparticles. Ionic strength and competing ion effects on the arsenic adsorption of these ZrO 2xH 2O nanoparticles were also studied. Testing with natural lake water confirmed the effectiveness of ZrO 2·xH 2O nanoparticles in removing arsenic species from natural water, and the immobilization of ZrO 2̇ xH 2O nanoparticles on glass fiber cloth minimized the dispersion of nanoparticles into the treated body of water. The high adsorption capacity of ZrO 2̇xH 2O nanoparticles is shown to result from the strong inner-sphere surface complexing promoted by the high surface area, large pore volume, and surface hydroxyl groups of zirconium oxide nanoparticles.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering