Zirar Fatima-Ezzahra, Katir Nadia, Qourzal Samir, Ichou Ihya Ait, El Kadib Abdelkrim
Euromed Research Center, Engineering Division, Euro-Med University of Fes (UEMF) Route de Meknes, Rond-Point de Bensouda 30070 Fès Morocco
Materials, Photocatalysis and Environment Team, Department of Chemistry, Faculty of Sciences, Ibn Zohr University B. P. 8106 Dakhla City Agadir Morocco.
RSC Adv. 2022 Aug 1;12(33):21145-21152. doi: 10.1039/d2ra04017d. eCollection 2022 Jul 21.
Owing to their use in water-cleaning technology, titanium-dioxide-based nanomaterials have dominated the photocatalysis scene, with so-called Degussa (P25) being the most promising under UV light. However, this is not the case under visible light, where it is necessary to combine titanium dioxide with other photosensitising nanomaterials. Unfortunately, most of the strategies aimed in this direction are chemically non-facile, energy-intensive, economically expensive, and not suitable for large-scale production. We herein describe a straightforward solvent-free approach for accessing visible-light-activated titanium-dioxide-based photocatalysts the mechanochemical grinding of Degussa P25 with a second solid partner. Upon comparing several solid-material benchmarks, P25-graphene oxide is the best combination. The resulting material showed efficient performance for the adsorption and photodegradation of different dye pollutants, namely methylene blue, malachite green, Congo red, and methyl orange. The recorded performance was nearly comparable to that reached using sol-gel materials, with the ultimate advantage of being more sustainable and industrially scalable. The recyclability can be improved through a porous-bead configuration using biomass waste chitosan hydrogel, an approach that can further fulfill the requirement for more sustainable photocatalyst designs.
由于在水净化技术中的应用，基于二氧化钛的纳米材料在光催化领域占据主导地位，其中所谓的德固赛（P25）在紫外光下最具前景。然而，在可见光下情况并非如此，此时需要将二氧化钛与其他光敏纳米材料结合。不幸的是，大多数朝着这个方向的策略在化学上并不简便、能源密集、经济成本高，且不适用于大规模生产。我们在此描述一种直接的无溶剂方法来制备可见光激活的基于二氧化钛的光催化剂——将德固赛P25与第二种固体伙伴进行机械化学研磨。在比较几种固体材料基准时，P25 - 氧化石墨烯是最佳组合。所得材料对不同染料污染物，即亚甲基蓝、孔雀石绿、刚果红和甲基橙，表现出高效的吸附和光降解性能。记录的性能几乎与使用溶胶 - 凝胶材料达到的性能相当，其最终优势在于更具可持续性且在工业上可扩展。通过使用生物质废料壳聚糖水凝胶的多孔珠配置可以提高可回收性，这种方法可以进一步满足更可持续光催化剂设计的要求。
