用于光催化硝基苯分解的 Bi/Zn 浸渍商用 TiO2 纳米粒子的性能评估

IF 2.8 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Journal of chemical technology and biotechnology Pub Date : 2024-05-17 DOI:10.1002/jctb.7666
Saurav Mishra, Nandana Chakinala, Anand G. Chakinala, Praveen K. Surolia
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引用次数: 0

摘要

通过掺杂 Bi 和 Zn 金属,对商用 TiO2 纳米颗粒进行了改性。在合成的催化剂中,Bi/Zn(0.25:0.75 wt%)共掺杂的催化剂表现出最佳的光催化降解活性,在 90 分钟的反应时间内达到 95% 的降解率,速率常数为 2.99 × 10-2 min-1。通过使用适当的自由基清除剂,阐明了降解过程中不同自由基的参与情况。此外,还采用一阶动力学模型对降解结果进行了研究,从而确定了降解过程的反应速率常数和初始速率。由于掺杂金属与商用 TiO2 的协同作用以及它们之间的电荷转移,观察到掺杂金属提高了光催化活性。据观察,在实际应用范围(即 5-20 °C)内,光催化性能随温度升高而提高。这种行为是由于电荷载流子的高速运动所致。此外,利用适当的自由基清除剂,成功地确定了各种自由基(如 h+、OH- 和 O2-)在硝基苯降解过程中的参与和作用。© 2024 化学工业学会(SCI)。
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Performance evaluation of Bi/Zn-impregnated commercial TiO2 nanoparticles for photocatalytic nitrobenzene decomposition

BACKGROUND

Commercial TiO2 nanoparticles were subjected to modification through Bi and Zn metal doping. The resulting catalysts were comprehensively characterized, and their performance was then reviewed for removal of model pollutant nitrobenzene in water.

RESULTS

Amidst the synthesized catalysts, the co-doping of Bi/Zn (0.25:0.75 wt%) demonstrated the best photocatalytic degradation activity, achieving 95% degradation within 90 min of reaction time, with 2.99 × 10−2 min−1 rate constant value. The involvement of different radicals during the degradation process was elucidated by employing appropriate radical scavengers. Furthermore, the degradation results were investigated applying the first-order kinetic model, leading to the determination of reaction rate constants and initial rates of the degradation process.

CONCLUSION

An improved photocatalytic activity was observed with metal doping due to the synergistic effect of doped metals with commercial TiO2 and profound charge transfer among them. It was observed that performance was increased with temperature rise in the practical range of application, that is, 5–20 °C. This behavior was due to high rate of movement of charge carriers. Further, involvement and functioning of various radical species such as h+, OH and O2 in nitrobenzene degradation were successfully established using appropriate radical scavengers. © 2024 Society of Chemical Industry (SCI).

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来源期刊
CiteScore
7.00
自引率
5.90%
发文量
268
审稿时长
1.7 months
期刊介绍: Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.
期刊最新文献
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