Rongshu Zhu

Effects of inorganic anions on TiO2 photocatalytic degradation of phenol

The effects of various inorganic anions (SO₄^2-, NO₃^-, H₂PO₄^-, HCO₃^-, CO₃^2-, F^-, Cl^-, Br^- and I^-) on the photocatalytic degradation of phenol were investigated under UV light irradiation. In present work, low initial pH value in the presence of H₂PO₄^- increased the photocatalytic degradation efficiency of TiO₂, high initial pH value in the presence of HCO₃^-, CO₃^2- and F^- decreased the photocatalytic degradation efficiency of TiO₂, and no change of initial pH value in the presence of SO₄^2- and NO₃^- had little effect on the photocatalytic degradation efficiency of TiO₂. The results indicated that the effects of the inorganic anions on the photocatalytic degradation of phenol depended strongly on the pH, which was related with the adsorption of phenol on the surface of TiO₂. No significant relationship between the initial pH and the photocatalytic degradation efficiency of TiO₂ was observed in the experiment with the addition of Cl^-, Br^- or I^-, indicating that inorganic anions inhibited the photocatalytic degradation efficiency of TiO₂ by their trapping hydroxyl radicals (OH·).

Effects of inorganic anions on TiO 2 photocatalytic degradation of phenol

The effects of various inorganic anions (SO₄^2-, NO₃^-, H₂PO₄^-, HCO₃^-, CO₃^2-, F^-, Cl^-, Br^- and I^-) on the photocatalytic degradation of phenol were investigated under UV light irradiation. In present work, low initial pH value in the presence of H₂PO₄^- increased the photocatalytic degradation efficiency of TiO₂, high initial pH value in the presence of HCO₃^-, CO₃^2- and F^- decreased the photocatalytic degradation efficiency of TiO₂, and no change of initial pH value in the presence of SO₄^2- and NO₃^- had little effect on the photocatalytic degradation efficiency of TiO₂. The results indicated that the effects of the inorganic anions on the photocatalytic degradation of phenol depended strongly on the pH, which was related with the adsorption of phenol on the surface of TiO₂. No significant relationship between the initial pH and the photocatalytic degradation efficiency of TiO₂ was observed in the experiment with the addition of Cl^-, Br^- or I^-, indicating that inorganic anions inhibited the photocatalytic degradation efficiency of TiO₂ by their trapping hydroxyl radicals (OH·).

Notice of Retraction Effects of inorganic anions on TiO 2 photocatalytic degradation of phenol

The effects of various inorganic anions (SO₄^2-, NO₃^-, H₂PO₄^-, HCO₃^-, CO₃^2-, F^-, Cl^-, Br^- and I^-) on the photocatalytic degradation of phenol were investigated under UV light irradiation. In present work, low initial pH value in the presence of H₂PO₄^- increased the photocatalytic degradation efficiency of TiO₂, high initial pH value in the presence of HCO₃^-, CO₃^2- and F^- decreased the photocatalytic degradation efficiency of TiO₂, and no change of initial pH value in the presence of SO₄^2- and NO₃^- had little effect on the photocatalytic degradation efficiency of TiO₂. The results indicated that the effects of the inorganic anions on the photocatalytic degradation of phenol depended strongly on the pH, which was related with the adsorption of phenol on the surface of TiO₂. No significant relationship between the initial pH and the photocatalytic degradation efficiency of TiO₂ was observed in the experiment with the addition of Cl^-, Br^- or I^-, indicating that inorganic anions inhibited the photocatalytic degradation efficiency of TiO₂ by their trapping hydroxyl radicals (OH·).

Removal of Bromate from Water by Silver-Supported Activated Carbon

Batch experiments were conducted to make a comparison in bromate removal between the silver-supported activated carbon (silver-AC) and virgin grander activated carbon(GAC). The probable mechanism of the better behavior of silver-AC was discussed. The effect of initial bromate concentration, pH and co-exist anions were also investigated in the study. Results showed that the removal efficiency of bromate increased about 25% by using silver-AC, a much better removal. Bromate reduction by silver-AC increases as the solution pH decreases. And the bigger the initial concentration was, the larger of BrO3- removal capacity by silver-AC was. Cl-¿F- and Br- had a slight effect on the removal of BrO3- while SO42-¿CO32-¿NO3- and PO43- showed a stronger influence. The affinity of the anions for silver-AC sites decreased in the following order CO32- ≫ PO43-≫ SO42- ≫ NO3- ≫ Br-≫ Cl-≫ F- when the co-exist anion concentration was 10mg/L.