Alahmad Waed, Hedhili Fekhra, Al-Shomar S M, Albaqawi Hissah Saedoon, Al-Shammari Nwuyer A, Abdelrahman Selma
Department of Chemistry, Faculty of Science, Applied Science Private University, P. O. Box 166, Amman, 11931, Jordan.
Department of Physics, College of Science, University of Ha'il, P.O. Box 2440, Ha'il, Saudi Arabia.
Heliyon. 2024 Aug 28;10(17):e36978. doi: 10.1016/j.heliyon.2024.e36978. eCollection 2024 Sep 15.
The abstract highlights the global issue of environmental contamination caused by organic compounds and the exploration of various methods for its resolution. One such approach involves the utilization of titanium dioxide (TiO) as a photocatalyst in conjunction with natural adsorption materials like kaolin. The study employed a modeling-based approach to investigate the sustainable photocatalytic degradation of acidic dyes using a Jordanian nano-kaolin-TiO composite material and solar energy. Mechanistic insights were gained through the identification of the dominant reactive oxygen species (ROS) involved in the degradation process, as well as the synergetic effect between adsorption and photocatalysis. The Jordanian nano-kaolin-TiO composite was synthesized using the sol-gel method and characterized. The nanocomposite photocatalyst exhibited particle sizes ranging from 27 to 41 nm, with the TiO nanoparticles well-dispersed within the kaolin matrix. The efficacy of this nanocomposite in removing Congo-red dye was investigated under various conditions, including pH, initial dye concentration, and photocatalyst amount. The optimal conditions for dye removal were found to be at pH 5, with an initial dye concentration of 20 ppm, and using 0.1 g of photocatalyst, resulting in a 95 % removal efficiency. The mechanistic insights gained from this study indicate that the hydroxyl radicals (•OH) generated during the photocatalytic process play a dominant role in the degradation of the acidic dye. Furthermore, the synergetic effect between the adsorption of the dye molecules onto the photocatalyst surface and the subsequent photocatalytic degradation by the ROS was found to enhance the overall removal efficiency. These findings contribute to the fundamental understanding of the photodegradation mechanisms and guide the development of more efficient photocatalytic systems for the treatment of acidic dye-containing wastewater. The use of solar power during the purification procedure also leads to cost reduction and strengthens sustainability efforts.
摘要强调了有机化合物造成的环境污染这一全球问题以及对解决该问题的各种方法的探索。一种这样的方法涉及将二氧化钛（TiO）用作光催化剂，并与高岭土等天然吸附材料结合使用。该研究采用基于模型的方法，利用约旦纳米高岭土-TiO复合材料和太阳能，研究酸性染料的可持续光催化降解。通过识别降解过程中涉及的主要活性氧物种（ROS）以及吸附和光催化之间的协同效应，获得了机理见解。采用溶胶-凝胶法合成并表征了约旦纳米高岭土-TiO复合材料。该纳米复合光催化剂的粒径范围为27至41纳米，TiO纳米颗粒在高岭土基质中分散良好。在包括pH值、初始染料浓度和光催化剂量等各种条件下，研究了这种纳米复合材料去除刚果红染料的效果。发现去除染料的最佳条件是pH值为5，初始染料浓度为20 ppm，使用0.1克光催化剂，去除效率达到95%。从这项研究中获得的机理见解表明，光催化过程中产生的羟基自由基（•OH）在酸性染料的降解中起主导作用。此外，发现染料分子吸附到光催化剂表面与随后ROS进行的光催化降解之间的协同效应提高了整体去除效率。这些发现有助于对光降解机制的基本理解，并指导开发更高效的用于处理含酸性染料废水的光催化系统。净化过程中使用太阳能还能降低成本并加强可持续发展努力。
