| Cr (VI) is harmful to environment and human; phenol is a common toxic organic pollutant at soil and ground water. Both of them are accumulated in the nature. In the previous research, photocatalytic degradation is considered a favored, cleaner, and greener technology for the removal of toxic organic pollutants from wastewater. However, the photocatalytic reduction Cr (Ⅵ) or phenol is usually studied singly. In this paper, phenol and Cr (Ⅵ) were photodegradated in the presence of Fe(Ⅲ), and their reaction kinetics mechanism and impact factors were studied.In chapter I The cooperative degradation of Cr(Ⅵ) and phenol with ultraviolet irradiation in the presence of Fe(Ⅲ) and its impac factors were investigated at15℃,25℃,35℃and in a pH range of2.0to4.0. The results demonstrated that the cooperative degradation of Cr(Ⅵ) and phenol was obviously enhanced by Fe(Ⅳ). Lower pH, higher temperature and Fe(Ⅲ) concentration were beneficial to increaseing the oxidation of phenol and the reduction of Cr(Ⅵ). Also, higher initial concentration of phenol/Cr(Ⅵ) efficiently increased the degradation of Cr(Ⅵ)/phenol. The oxidation of phenol and the reduction of Cr(VI) fitted to one-order reaction rate equation.In chapter II The cooperative degradation of Cr(VI) and phenol with simulate sunlight in the presence of Fe(III) and its impact factors were investigated at15℃,25℃,35℃and in a pH range of2.0to4.0. The results demonstrated that the cooperative degradation of Cr(VI) and phenol was obviously enhanced by Fe(Ⅲ) at Xenon of500W. Higher temperature and Fe(Ⅲ) concentration was beneficial to increaseing the oxidation of phenol and the reduction of Cr(Ⅵ). Also, higher initial concentration of phenol/Cr(Ⅵ) efficiently increased the degradation of Cr(Ⅵ)/phenol. Low pH can increased the degradation of phenol also. But the the most quickly degradation of Cr(VI) was at pH3. The oxidation of phenol and the reduction of Cr(VI) fitted to one-order reaction rate equation. |
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