Photocatalytic Selected Reduction of Nitrate and Nitrite by Nano-Pd@Fe/TiO2
A series of ternary Pd@Fe/TiO2 catalysts were fabricated by microwave hydrothermal and photoreduction method for ultraviolet visible(UV-Vis)photoreduction of nitrate and nitrite.Compared with pure Fe/TiO2,1%Pd@Fe/TiO2 catalyst showed enhanced photocatalytic performance under the condition of UV-Vis,hypoxia and no hydrogen source,and 93.4%nitrate and 90.5%nitrite were removed within 180 min.The dynamics conformed to the first-order attenuation model showed that the optimal rate constant of 1%Pd@Fe/TiO2 was 3.16 times of Fe/TiO2 and 4.92 times of TiO2,respectively.The enhanced activity is due to the extension of the spectrum absorption range of the Schottky barrier between Fe and TiO2 and the surface effect of Pd.The repeatability test of 1%Pd@Fe/TiO2 showed that the sample had high stability.In addition,the effect of Pd loading on nitrate selectivity and the mechanism of photocatalytic nitrogen removal were studied and discussed in detail.
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