The fluorescence and room temperature activity of a palygorskite supported Y₂O₃:(Eu³⁺,Au³⁺) nanocomposite were investigated to design a fluorescence-indicated catalyst. The effects of Au³⁺ doping on the structure and surface properties of the host material were systematically characterized. The fluorescence intensity of Y₂O₃:Eu³⁺ was affected by Au³⁺ doping, which was related to the crystallinity of Y₂O₃. Excess Au³⁺ ions were segregated to the host surface and reduced to metallic Au. The local symmetry of Eu³⁺ was reduced by Au³⁺ doping, which benefited the energy transfer between Eu³⁺ and Au³⁺. Energy absorbed by Eu³⁺ was transferred from Au³⁺ to metallic Au, where electrons were produced. These electrons were absorbed by O₂ to change into O₂⁻, which acted as the oxidant for ortho-dichlorobenzene (o-DCB). The variation of fluorescence intensity during the catalytic reaction was observed. The room temperature catalytic activity of the nanocomposite under UV irradiation was revealed. The as-synthesized nanocomposite might have potential applications in environmental fields.

中文翻译：

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Y ₂ O ₃：（Eu ³⁺，Au ³⁺）/坡缕石纳米复合材料的荧光和室温活性†

研究了凹凸棒石负载的Y ₂ O ₃：（Eu ³⁺，Au ³⁺）纳米复合材料的荧光和室温活性，设计了荧光指示催化剂。系统地表征了Au ³⁺掺杂对基质材料结构和表面性能的影响。Y ₂ O ₃：Eu ³⁺的荧光强度受Au ³⁺掺杂的影响，这与Y ₂ O ₃的结晶度有关。过量的Au ³⁺离子被隔离到主体表面，并还原为金属Au。Eu ³⁺的局部对称性通过Au ³⁺掺杂降低了^{Eu 3+的}含量，这有利于Eu ³⁺和Au ³⁺之间的能量转移。Eu ³⁺吸收的能量从Au ³⁺转移到金属Au，在其中产生电子。这些电子被被O吸收₂到变化制成O ₂ ^- ，其充当氧化剂为邻二氯苯（ø -DCB）。观察到催化反应期间荧光强度的变化。揭示了在紫外线照射下纳米复合材料的室温催化活性。合成后的纳米复合材料可能在环境领域具有潜在的应用。