Details

Autor(en) / Beteiligte

• Nguyen, T.V.
• Vigneswaran, S.
• Ngo, H.H.
• Kandasamy, J.
• Choi, H.C.

Titel

Arsenic removal by photo-catalysis hybrid system

Ist Teil von

• Separation and purification technology, 2008-06, Vol.61 (1), p.44-50

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2008

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Arsenic is a toxic semi-metallic element that can be fatal to human health. Arsenic pollution in water is found in many parts of the world, especially in developing countries such as Bangladesh, India, Nepal, and Vietnam. Photo-oxidation experiments with titanium dioxide (TiO 2) as photo-catalyst showed that photo-oxidation of As(III) to As(V) is possible within minutes. Further, TiO 2 can also adsorb both As(III) and As(V) on its surface. Photo-catalysis reaction with TiO 2 reduced about 98% of arsenite from water containing 500 μg/L of arsenite. By adding nano-scale zero valent iron (nZVI) of 0.05 g/L in the photo-reactor, arsenic removal can be significantly enhanced. Further the TiO 2 requirement is five times less in this photo-catalysis nZVI hybrid system. The photo-catalytic degradation processes was modeled using the first-order, second-order and Langmuir–Hinshelwood kinetics equations and removal rates were simulated.