Figure 2: effect of pH on ZnO catalyzed ozonation. [ZnO]=300 mgL-1 ; [O3]o = 5.64 mgL-1 ; [4C2NP]o = 12 mgL-1 Reaction rate constant of 4C2NP with nano-ZnO/O3A kinetic study of 4C2NP removal in the presence of nano ZnO was carried out at different pHs (3,7 and 9). The equa-tion rate of 4C2NP decomposition with nano-ZnO/O3 can be written as:(d[4C2NP])/dt = -kO3.[4C2NP][O3][ZnO] + kOH0[4C2NP][OH0][ZnO] (1)Here, [4C2NP], [O3],[OH0] and [ZnO] are the concentrations of 4C2NP, ozone, hydroxyl radicals and zinc oxide, respectively. KO3 and k0OH are the rate constants of 4C2NP with ozone and hydroxyl radicals, respectively.
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