Investigation of photo-catalytic removal of arsenic from aqueous solutions using UV/H2O2 in the presence of ZnO nanoparticles

The presence of arsenic in potable water is a serious problem for human. Arsenic-containing water has irreparable effects on the consumer. So, the total objective of this work was to provide a photo-catalytic process to degrade of arsenic from aqueous solutions. The studied variables included H2O2 concentration, initial arsenic concentration, ZnO dosage, pH, and contact time. The intensity of the output light was equivalent to 600 mJ cm(-2). The removal of arsenic efficiency by UV and H2O2 alone was 15% and 8%, respectively. In acidic conditions, the combined process had a higher removal efficiency for arsenic. pH(zpc) for ZnO was nearly 9. The optimal dose of ZnO nanoparticles was 1 g L-1. The average diameter of ZnO was from 52.27 to 304.8 nm. The optimal contact time was chosen for 45 min. After this time, the removal efficiency of arsenic has a slight difference.