Heterogeneous photocatalysis with TiO2 for the oxidation of arsenic and its removal from water by coprecipitation with ferric sulfate

Química Nova

Mendes, Gisele¹  Marques Neto, José de Oliveira¹  Universidade Federal de Viçosa¹  Bellato, Carlos Roberto¹ 

关键词: photocatalysis;    oxidation;    arsenic removal.;   

DOI  :  10.1590/S0100-40422009000600021

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The oxidation of arsenic (As(III) to As(V)) in water samples was performed by heterogeneous photocatalysis using a TiO2 film immobilized inside a photochemical reactor. After oxidation, As(V) was removed from the water samples by coprecipitation with ferric sulfate. The final conditions of oxidation and arsenic removal (TiO2 film prepared with a suspension: 10% (w/v); pH: 7.0; oxidation time: 30 min and Fe3+ concentration: 50 mg L-1) were applied in natural water samples which were supplemented with 1.0 mg L-1 of As(III) to verify the influence of the matrix. After treatment, more than 99% of arsenic was removed from the water.

【 授权许可】

Unknown