terbutryn, atrazine and terbuthylazine) and three chloroacetanilide (propachlor, s-
metolachlor, alachlor) herbicides in leaching water has been investigated. Zinc oxide (ZnO)
and titanium dioxide (TiO2) were used as semiconductors at pilot plant scale under natural
sunlight. The addition of an oxidant (Na2S2O8) to the semiconductor suspensions led to an
increase in the rate of photooxidation. Comparison of catalysts showed that ZnO was the …