Advances in bromate reduction by heterogeneous photocatalysis: The use of a static mixer as photocatalyst support

Add time:08/05/2019    Source:sciencedirect.com

This study focuses on bromate (BrO3−) removal from pure aqueous solutions by heterogeneous photocatalysis using a stainless steel Kenics® static mixer (SM) as support for the stabilization of TiO2-P25 thin films. The SM was assembled in a tubular photoreactor coupled to a compound parabolic collector (CPC) for light capture. The effect of the following parameters on the BrO3− photocatalytic reduction rate was assessed: SM treatment before TiO2-P25 deposition, number of TiO2-P25 layers deposited by dip coating, position of the SM during the coating procedure, solution pH, solution temperature, dissolved oxygen (DO) content, and addition of formic acid (HCOOH) as organic sacrificial agent. Furthermore, the TiO2-P25 films were characterized and their stability was evaluated. Higher BrO3− photocatalytic reduction rates were attained for: the thermally pre-treated SM, 6 TiO2-P25 layers, the vertically positioned SM during coating, acidic pH, and higher temperatures. The DO had a negligible effect for pH values below 5.5 and a negative effect for higher pH values. The HCOOH declined the BrO3− photocatalytic reduction rates when an initial [HCOOH]:[BrO3−] molar ratio of 3:1 was applied and had a null influence when used in lower amounts. The generated TiO2-P25 films proved to be stable.

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