Abstract
Removal of 2-nitrophenol (2NP) from aqueous solution was performed using Sono-Fenton process. The Box–Behnken design (BBD) of experiments was used to investigate the influence of operational factors such as pH, initial concentration of hydrogen peroxide and ferrous ions on the removal of 2NP. The ANOVA (analysis of variance) showed a satisfactory prediction second-order regression model and a high determination coefficient value. The optimum conditions predicted by the model were as follows: the [Fe2+] = 10 mg/L, pH 3, and [H2O2] = 475 mg/L. The results showed that at the predicted optimum conditions and after 60 min of reaction, the degradation of 70 mg/L of 2NP and its corresponding Chemical oxygen demand (COD) was 97.8 and 76.5%, respectively. The kinetic study for mineralization of 2NP was investigated and the rate constants (K = 25.4 × 10–3 min–1) and half-life time of mineralization reaction ( $${{t}_{{1/2}}}$$ = 27.28 min) were achieved.
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