Treatment of electrochemical plating wastewater by heterogeneous photocatalysis: the simultaneous removal of 6:2 fluorotelomer sulfonate and hexavalent chromium.

ABSTRACT: 6:2 fluorotelomer sulfonate (6:2 FtS) is being widely used as a mist suppressant in the chromate (Cr(vi)) plating process. As a result, it is often present alongside Cr(vi) in the chromate plating wastewater (CPW). While the removal of Cr(vi) from CPW has been studied for decades, little attention has been paid to the treatment of 6:2 FtS. In this study, the removal of Cr(vi) and 6:2 FtS by Ga₂O₃, In₂O₃, and TiO₂ photocatalysts was investigated. In the Ga₂O₃/UVC system, over 95% of Cr(vi) was reduced into Cr(iii) after only 5 min. Simultaneously, 6:2 FtS was degraded into F^- and several perfluorocarboxylates. The predominant reactive species responsible for the degradation of 6:2 FtS in the Ga₂

SUBMITTER: Kim HH 

PROVIDER: S-EPMC9043800 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature