A reusable and efficient photo-catalyst based on halloysites (HNTs) and La³⁺ ion-doped TiO₂ nanoparticles was prepared using a sol-gel process and a sonochemical method for decomposing organic dyes. As a support, the HNTs increased the adsorption efficiency of substrates, improving the photocatalytic activity of TiO₂ nanoparticles by ∼3 times. The La³⁺ ion doping of TiO₂ decreased the bandgap from 3.25 eV to 3.01 eV, expanding the spectral response to the visible region and enhancing the photocatalytic activity under the sunlight by 1.5 times. Through the integration of the halloysite support and the La³⁺ ion doping of TiO₂, the synergistic enhancement of photocatalytic activity was observed and systematically investigated using XRD, Raman spectroscopy, FT-IR, FE-SEM, EDX-TEM, and zeta potential. In this research, we used Rhodamine B molecules as a model pollutant. During the decomposing process, the HNTs enhanced the local dye concentration nearby the photo-catalyst through the electrostatic interaction, thereby boosting the photocatalytic activity by ∼3 times. Additionally, the catalyst can be separated by simple centrifugation and reused at least five recycles without any activity decrease. The halloysite support, the La³⁺ ion doping of TiO₂ and their simple synthesis approach could provide a practical tool for environmental purification in wastewater using sunlight.

使用溶胶-凝胶法和声化学方法分解有机染料，制备了基于埃洛石 (HNT) 和 La ³⁺离子掺杂的 TiO ₂纳米粒子的可重复使用且高效的光催化剂。作为载体，HNTs提高了基材的吸附效率，将TiO ₂纳米颗粒的光催化活性提高了约3倍。TiO ₂的La ³⁺离子掺杂使带隙从3.25 eV降低到3.01 eV，扩大了对可见光区的光谱响应，将阳光下的光催化活性提高了1.5倍。通过埃洛石载体和TiO ₂的La ³⁺离子掺杂的整合  ，使用XRD，拉曼光谱，FT-IR，FE-SEM，EDX-TEM和zeta电位观察并系统地研究了光催化活性的协同增强。在这项研究中，我们使用罗丹明 B 分子作为模型污染物。在分解过程中，HNTs 通过静电相互作用增强了光催化剂附​​近的局部染料浓度，从而将光催化活性提高了约 3 倍。此外，催化剂可以通过简单的离心分离并重复使用至少五次循环而不会降低任何活性。埃洛石载体、TiO ₂的La ³⁺离子掺杂及其简单的合成方法可以为利用阳光净化废水中的环境提供实用工具。