Abstract
In order to effectively eliminate dyestuff in aquatic environment under solar irradiation, the europium-nitrogen (EuN) co-doped TiO2/Sepiolite nanocomposites were successfully fabricated via microwave-hydrothermal method. The effects of Eu and N contents on the chemical properties and crystal structure of the obtained nanocomposites were characterized. It was found that the carrier sepiolite was uniformly covered by doped-TiO2 nanoparticles and the doped Eu is beneficial for the growth of anatase crystallite. Furthermore, doped N extended the absorption to the visible region, and the doped EuIII increased the adsorption ability further. The visible-light photocatalytic activities of the samples were evaluated for degradation of orange G. The results showed that the co-doped sample presented enhanced photocatalytic activity compared to undoped and mono-doped samples. The increase in degradation efficiency can be ascribed to the synergistic effects of Eu and N co-doping. Among all samples, the optimum EuIII doped content was 0.6% for the co-doped sample. The co-doped sample can also effectively treat real textile dye wastewater with over 70% COD removal efficiency in 3 h of irradiation time. This research demonstrates the co-doped TiO2/Sepiolite nanocomposites have a prospective application in textile dye wastewater treatment.
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