?Arsenic (III) oxidation of water applying a combination of hydrogen peroxide and UVC radiation?

MAIA LESCANO; CRISTINA ZALAZAR; ALBERTO CASSANO; RODOLFO BRANDI

Photochemical and Photobiological Sciences

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2011 p. 1797 - 1803

1474-905X

Arsenic is toxic to both plants and animals and inorganic arsenicals are proven carcinogens in humans. The oxidation of As(III) to As(V) is desirable for enhancing the immobilization of arsenic and is required for most arsenic removal technologies. The main objective of this research is to apply an Advanced Oxidation Process that combines ultraviolet radiation and hydrogen peroxide (UVC/H2O2) for oxidizing aqueous solutions of As(III). For that purpose, a discontinuous photochemical reactor (laboratory scale) was built with two 40 W tubular germicidal lamps (l = 253.7 nm) operating inside a recycling system. The study was made beginning with a concentration of 200 mg L-1 of As(III), changing the H2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). III) to As(V) is desirable for enhancing the immobilization of arsenic and is required for most arsenic removal technologies. The main objective of this research is to apply an Advanced Oxidation Process that combines ultraviolet radiation and hydrogen peroxide (UVC/H2O2) for oxidizing aqueous solutions of As(III). For that purpose, a discontinuous photochemical reactor (laboratory scale) was built with two 40 W tubular germicidal lamps (l = 253.7 nm) operating inside a recycling system. The study was made beginning with a concentration of 200 mg L-1 of As(III), changing the H2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). 2O2) for oxidizing aqueous solutions of As(III). For that purpose, a discontinuous photochemical reactor (laboratory scale) was built with two 40 W tubular germicidal lamps (l = 253.7 nm) operating inside a recycling system. The study was made beginning with a concentration of 200 mg L-1 of As(III), changing the H2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). III). For that purpose, a discontinuous photochemical reactor (laboratory scale) was built with two 40 W tubular germicidal lamps (l = 253.7 nm) operating inside a recycling system. The study was made beginning with a concentration of 200 mg L-1 of As(III), changing the H2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). l = 253.7 nm) operating inside a recycling system. The study was made beginning with a concentration of 200 mg L-1 of As(III), changing the H2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). mg L-1 of As(III), changing the H2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). 2O2 concentration and the spectral fluence rate on the reactor windows. Based on references in the literature on the photolysis of hydrogen peroxide, arsenic oxidation and our experimental results, a complete reaction scheme, apt for reaction kinetics mathematical modelling, is proposed. In addition, the effectiveness of arsenic oxidation was evaluated using a raw groundwater sample. It is concluded that the photochemical treatment of As(III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V). III) usingH2O2 and UVC radiation is a simple and feasible technique for the oxidation of As(III) to As(V).III) to As(V).