Removal of aqueous phase selenite and selenate using artifical and solar radiation energized photocatalysis

摘要

A method for the removal of aqueous phase selenite and selenate species using TiO2 assisted photocatalysis employing the use of artificial light, or solar radiation, in conjunction with EDTA as a hole scavenger. Among the two processes, UV-lamp assisted photocatalysis has the highest efficiency comparatively followed by solar light assisted photocatalysis. TiO2 mediated photocatalysis in conjunction with EDTA as an h+ scavenging agent is an efficient technique for selenium ion removal.

主权项

1. A method for removing selenium-containing materials from an aqueous solution comprising:
introducing an unmodified TiO2 photocatalyst to an aqueous solution comprising EDTA as a h+ scavenging agent, and selenium-containing materials to form a mixed solution; adjusting the pH of the mixed solution with addition of an acid or base additive; transferring the mixed solution to a reactor that produces UV light with a 315-400 nm wavelength range; exposing the mixed solution to the UV light to induce photocatalytic reduction and removal of selenium oxyanions from the mixed solution in the form of elemental selenium.