Kundu Sani, Sarkar Toton, Al-Ahmadi Ahmad Aziz, Ali Enas, Bhattacharjee Ashis
Department of Physics, Visva-Bharati University Santiniketan 731235 India
Department of Electrical Engineering, College of Engineering, Taif University P. O. Box 11099 Taif 21944 Saudi Arabia.
RSC Adv. 2024 Sep 11;14(39):28944-28955. doi: 10.1039/d4ra04316b. eCollection 2024 Sep 4.
In recent years, water pollution has become a pressing global issue because of the continuous release of organic dyes from various industries. Therefore, finding an easy way to remove these harmful dyes from water has drawn the attention of researchers. This study investigates the removal of toxic Rose Bengal (RB) dye using hematite nanoparticles as a visible light photocatalyst without any additive. It is observed that by controlling particle size, quantity of the nanoparticles and reaction temperature, the dye degradation can be improved up to 95.33% with a half-life of 26 min. To understand photodegradation kinetic behavior, the Langmuir-Hinshelwood kinetic equation can be employed. The scavenger test indicated that the OH* radicals majorly led to the photodegradation process. The reaction rate values strongly depended on the size, quantity of the nanoparticles and reaction temperature. Controlling the optimizing condition, faster reaction rate ( = 0.027 min) can be achieved as compared to earlier reports. It is also noted that the change in the degradation efficiency of the reused catalyst is negligible when compared to the fresh one. Here, the dye degradation mechanism is discussed. Overall, this study reveals that hematite nanoparticles can be used as efficient photocatalyst for dye degradation applications by optimizing the controlling factors. These observations provide novel perspectives on the development of effective and sustainable photocatalytic technologies for pollution control and water treatment applications.
近年来，由于各行业不断释放有机染料，水污染已成为一个紧迫的全球问题。因此，找到一种从水中去除这些有害染料的简便方法引起了研究人员的关注。本研究考察了以赤铁矿纳米颗粒作为可见光光催化剂、不添加任何添加剂对有毒孟加拉玫瑰红（RB）染料的去除效果。据观察，通过控制粒径、纳米颗粒数量和反应温度，染料降解率可提高至95.33%，半衰期为26分钟。为了解光降解动力学行为，可采用朗缪尔 - 欣谢尔伍德动力学方程。清除剂试验表明，OH*自由基是光降解过程的主要原因。反应速率值强烈依赖于纳米颗粒的尺寸、数量和反应温度。通过控制优化条件，与早期报道相比可实现更快的反应速率（= 0.027分钟）。还注意到，与新鲜催化剂相比，重复使用的催化剂降解效率的变化可忽略不计。在此，讨论了染料降解机理。总体而言，本研究表明，通过优化控制因素，赤铁矿纳米颗粒可作为染料降解应用的高效光催化剂。这些观察结果为开发用于污染控制和水处理应用的有效且可持续的光催化技术提供了新的视角。
