Abstract
AbstractThe herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was degraded in an internal circulation three-phase fluidized photoreactor (ICFPR) using nitrogen doping TiO2 and γ-Al2O3 composite oxide granules (N-TiO2/γ-Al2O3) as an adsorbent and photocatalyst. Granules of N-TiO2/γ-Al2O3 were prepared by a coprecipitation/oil-drop/calcination process using titanium sulfate and aluminum sulfate as raw materials and eiderdown was used as nitrogen doped and holes formed substance. The effects of the initial concentration and solution pH on the adsorption capacity of the granules for 2,4-D were investigated. The physiochemical performance and photocatalytic activity of 2,4-D degradation of the granules were studied. The results of this research indicated that the composite granules had anatase TiO2 and γ-Al2O3 phases with granularity of 0.5–1.0 mm and could be used as an adsorbent and photocatalyst in an ICFPR reactor. The granules had excellent adsorption performance as the amount of adsorption for 2,4-D could...
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