New Advances in Heterogeneous Photocatalysis for Treatment of Toxic Metals and Arsenic

Heterogeneous photocatalytic Cr(VI) reduction with short and long nanotubular TiO 2 coatings prepared by anodic oxidation

“…Refs. [33][34][35][36][37][38][39][40][41][42][43]), is highly desirable for a better comparison of the photocatalytic activities, through a very simple monitoring of the Cr(VI) concentration. In addition, this represents a good alternative for the removal of dangerous hexavalent chromium species from aqueous systems.…”

Abatement of toxicity of effluents containing Cr(VI) by heterogeneous photocatalysis. Toxicity assessment by AMPHITOX assay

“…The importance of saving water is relevant not only from an ecological but also from an industrial point of view. It is pertinent to mention that the presence of organic matter in real waters does not interfere with the HP technology; moreover, most organic compounds exert a synergistic effect on the photocatalytic efficiency for Cr(VI) reduction (Litter, 1999;Litter and Quici, 2014;Litter, 2015). Also, it is very well known that organic matter itself diminishes the toxic effects caused by Cr(VI) in natural waters by means of its reduction to Cr(III) (Fendorf, 1995).…”

“…1). Experimental conditions were the same as used in previous works of the group (Litter, 1999;Litter and Quici, 2014;Litter, 2015;Meichtry et al, 2014), the Cr(VI) concentration being that typically found in wastewaters (Owlad et al, 2009). The temporal profile indicates a rapid reaction during the first 30 min followed by a decrease of the reaction rate.…”

“…Refs. Litter, 1999;Wang et al, 2008;Litter and Quici, 2014;Litter, 2015;Meichtry et al, 2014). However, generated oxidative radicals, intermediate species, or TiO 2 itself might produce adverse effects on the environment.…”

Heterogeneous photocatalytic removal of U(VI) in the presence of formic acid: U(III) formation

“…Heterogeneous photocatalysis (HP) of aqueous U(VI) systems has been rather well studied [1][2][3][4][5] as an economical and simple alternative to conventional removal methods [6][7][8]. This technological approach can solve not only environmental problems but also those related to actinide valence state control for waste minimization in nuclear fuel processing.…”