Abstract In order to effectively eliminate dyestuff in aquatic environment under solar irradiation, the europium-nitrogen (Eu N) 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.

中文翻译：

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铕氮共掺杂 TiO2/海泡石纳米复合材料的制备及其在实际废水处理中光催化活性的提高

摘要 为有效去除太阳辐照下水环境中的染料，采用微波-水热法成功制备了铕-氮(Eu N)共掺杂TiO2/海泡石纳米复合材料。表征了Eu和N含量对所得纳米复合材料的化学性质和晶体结构的影响。发现载体海泡石被掺杂的TiO2纳米颗粒均匀覆盖，掺杂的Eu有利于锐钛矿微晶的生长。此外，掺杂的 N 将吸收扩展到可见光区，掺杂的 EuIII 进一步增加了吸附能力。评估样品的可见光光催化活性对橙色 G 的降解。结果表明，与未掺杂和单掺杂的样品相比，共掺杂的样品表现出增强的光催化活性。降解效率的提高可归因于 Eu 和 N 共掺杂的协同效应。在所有样品中，共掺杂样品的最佳 EuIII 掺杂含量为 0.6%。共掺杂样品还可以有效处理真正的纺织染料废水，在 3 小时的辐照时间内 COD 去除率超过 70%。该研究表明共掺杂的 TiO2/海泡石纳米复合材料在纺织染料废水处理中具有前瞻性应用。共掺杂样品还可以有效处理真正的纺织染料废水，在 3 小时的辐照时间内 COD 去除率超过 70%。该研究表明共掺杂的 TiO2/海泡石纳米复合材料在纺织染料废水处理中具有前瞻性应用。共掺杂样品还可以有效处理真正的纺织染料废水，在 3 小时的辐照时间内 COD 去除率超过 70%。该研究表明共掺杂的 TiO2/海泡石纳米复合材料在纺织染料废水处理中具有前瞻性应用。