Ayala S López, Campos C Menchaca, Rincón M E, Pérez C A García, Uruchurtu J
Centro de Investigación en Ingeniería y Ciencias Aplicadas-Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, 62209 Cuernavaca, Mor, Mexico.
Instituto de Energías Renovables-Universidad Nacional Autónoma de México, privada Xochicalco s/n, Azteca, 62588 Temixco, Mor, Mexico.
Heliyon. 2024 Mar 11;10(6):e27269. doi: 10.1016/j.heliyon.2024.e27269. eCollection 2024 Mar 30.
Advanced oxidation processes (AOP), using semiconductor (SC) and hydroxyapatite (HA) composites, are promising due to the synergy of photocatalytic and adsorption properties. Still, dye removal efficiency of composites based on HA-SC remains low, because most of the research reported consider single SC materials. In this work, nanocrystalline xerogels of titanium oxide (TiO) with copper oxide (CuO) and HA were synthesized by the sol-gel process. HA was obtained by the precipitation method without heat treatment and calcined in the range of 200-1000 °C. TiO and copper precursors were added to a sol containing HA in a 12:1 mol ratio, obtaining HA-TiO and HA-CuO-TiO nanomaterials. The xerogels were characterized by X-ray diffraction, scanning electron microscopy, emission field scanning electron microscopy and photoresponse. Their performance in the photocatalytic discoloration of an aqueous solution acid yellow dye 36 (AY36) was evaluated, using visible and UV light. The best discoloration was achieved with HA-CuO-TiO xerogels with HA calcined at 600 °C, showing a degradation kinetic constant of 0.24 min. In contrast, HA-TiO materials showed little or no photocatalytic activity, but strong dye adsorption/desorption. The thermal treatment of HA determines the filament-like morphology and degree of compaction of the nanomaterials, which are relevant in the crystallite size and sensitization of the SC matrix. Further studies must address the surface chemistry and rectifying properties of the best SC composite to have a more complete understanding of the mechanisms involved.
使用半导体（SC）和羟基磷灰石（HA）复合材料的高级氧化工艺（AOP）由于光催化和吸附性能的协同作用而具有广阔前景。然而，基于HA-SC的复合材料对染料的去除效率仍然很低，因为大多数已报道的研究都只考虑单一的SC材料。在这项工作中，通过溶胶-凝胶法合成了含有氧化铜（CuO）和HA的纳米晶二氧化钛（TiO）干凝胶。HA通过沉淀法获得，无需热处理，并在200-1000°C范围内煅烧。将TiO和铜前驱体以12:1的摩尔比添加到含有HA的溶胶中，得到HA-TiO和HA-CuO-TiO纳米材料。通过X射线衍射、扫描电子显微镜、发射场扫描电子显微镜和光响应来表征干凝胶。使用可见光和紫外光评估了它们对酸性黄染料36（AY36）水溶液的光催化褪色性能。HA在600°C煅烧的HA-CuO-TiO干凝胶实现了最佳褪色效果，降解动力学常数为0.24 min⁻¹。相比之下，HA-TiO材料几乎没有光催化活性，但具有很强的染料吸附/解吸能力。HA的热处理决定了纳米材料的丝状形态和压实程度，这与SC基体的微晶尺寸和敏化作用相关。进一步的研究必须探讨最佳SC复合材料的表面化学和整流性能，以便更全面地了解其中涉及的机制。
