Arsenite to Arsenate Oxidation and Water Disinfection via Solar Heterogeneous Photocatalysis: A Kinetic and Statistical Approach

Arsenic (As) poses a threat to human health. In 2014, more than 200 million people faced arsenic exposure through drinking water, as estimated by the World Health Organization. Additionally, it is that water with proper microbiological quality unavailable for 1 billion people. The present work analyzed solar heterogeneous photocatalytic (HP) process arsenite (AsIII) oxidation and coliform disinfection from real groundwater matrix employing two reactors, flat plate reactor (FPR) compound parabolic collector (CPC), without added hydrogen peroxide (H2O2). pseudo first-order reaction model fitted well As data. treatments FPR–HP + H2O2 CPC–HP yielded best rates, which were over 90%. These also exhibited highest rate constants, 6.7 × 10−3 min−1 6.8 min−1, respectively. removal rates via chemical precipitation reached 98.6% 98.7% these treatments. no coliforms detected at end of process. area per order (ACO) HP was on average 75% efficient photooxidation (PO) effects independent variables, addition, light irradiation statistically significant AsIII (p < 0.05).