ENVR 150 |
| In order to enhance treatment technologies for As(III) and meet stringent maximum contaminant level (MCL) for drinking water, new technologies are urgently required. In this study, As(III) removal using mesoporous titania (MT) and titanium containing mesoporous silica molecular sieve (Ti-SBA-15) was investigated. Unlike other conventional adsorbents, these mesoporous adsorbents (MAs) with nano-sized transition metal can provide higher surface area, large pore volume, well-ordered structure framework and high surface functional density due to their highly regular nanopores. The kinetic results showed that fast uptake of As(III) occurred and, subsequently, fast equilibrium between As(III) and MAs in solution was reached within almost 5 minutes. The isotherm test indicated that MT had higher sorption capacity than Ti(x)-SBA-15. In pH adsorption envelope of As(III), the higher removal efficiency of As(III) occurred at the pH ranges of 7–10 and 4–6.5 for MT and Ti(25)-SBA-15, respectively. |
|
General Papers
6:00 PM-8:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster
Sci-Mix
Division of Environmental Chemistry |