Removal of 4-chlorophenoles from simulated wastewater by advanced oxidation processes

Abstract EN

The degradation and mineralization of 4-chlorophenol (4-CP) by advanced oxidation processes (AOPs) was investigated in this work, using both of UV / H2O2 and photo-Fenton UV / H2O2 / Fe+3 systems.

The reaction was influenced by the input concentration of H2O2, the amount of the iron catalyst, the type of iron salt, the pH and the concentration of 4-CP.

A colored solution of benzoquinon can be observed through the first 5 minutes of irradiation time for UV / H2O2 system when low concentration (0.01mol / L) of H2O2 was used.

The colored solution of benzoquinon could also be observed through the first 5 minutes for the UV / H2O2 / Fe+3 system at high concentration (100ppm) of 4-CP.

The results have shown that adding Fe+3 to the UV / H2O2 system enhanced the rate of 4-CP oxidation at a molar ratio of H2O2 / Fe+3 / 4-CP equals to 13 / 0.4 / 1 by a factor of 7.

This reduced the consumption of H2O2 by a factor of 6 and the irradiation time required for complete degradation was reduced by a factor of 6.

The experimental results have shown that the optimum reagents for a complete degradation of 4-CP (50ppm) were H2O2.= 0.005mol / L, Fe+3 = 0.16 * 10-3 mol / L under acidic condition (pH = 3) and irradiation time of 15 min for the UV / H2O2 / Fe+3 system with a molar ratio of H2O2 / Fe+3 / 4-CP equals to 13 / 0.4 / 1.