在臭氧化过程中增强酸II降解,使用CaFe2O4纳米粒子作为异质催化剂
Huu Tap Van1,2, Van Hung Hoang3,4, Thi Cuc Luu4
1Center for Advanced Technology Development, Thai Nguyen University Tan Thinh Ward Thai Nguyen City Vietnam.
RSC advances
|October 4, 2023
概括
铁氧化 (CaFe2O4) 纳米颗粒有效催化臭氧化,降解酸II (AOII) 染料. 与仅使用臭氧相比,这种异质的催化臭氧化过程显著提高了染料和TOC的去除效果.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 酸II (AOII) 是一种常见于织废水中的持久有机污染物.
- 臭氧化是一种有效的先进氧化过程,用于降解有机污染物,但其效率可能是有限的.
- 不同质的催化剂可以通过激活臭氧和促进污染物降解来提高臭氧化的效率.
研究的目的:
- 研究CaFe2O4纳米颗粒作为异质催化剂在臭氧化中对酸II (AOII) 降解的有效性.
- 为了比较CaFe2O4/O3催化臭氧化与仅用臭氧 (O3) 处理的性能.
- 评估运行参数 (如pH值,催化剂剂量和初始AOII度) 对降解效率和动力学的影响.
主要方法:
- 进行了比较CaFe2O4/O3异质催化臭氧化与单独O3的实验.
- 测试了pH (3-11),CaFe2O4剂量 (0.25-2.0 g L-1) 和初始AOII度 (100-500 mg L-1) 的变化.
- 分析了降解效率 (色彩和TOC去除) 和反应动力学 (伪第一阶).
主要成果:
- 单独的O3和CaFe2O4/O3系统都实现了AOII的几乎完全色彩去除.
- 该CaFe2O4/O3系统显示出更快的色彩去除率和更高的全有机碳 (TOC) 去除效率,特别是在pH9.
- 降解跟随伪第一阶动力学,CaFe2O4/O3系统的速率常数 (k) 比单独的O3高得多,特别是在pH9 (1.83倍以上) 时.
- 最佳的TOC去除发生在pH 9下,CaFe2O4剂量为1.0g L-1.
- 增加的AOII度对TOC去除效率产生了负面影响,并降低了反应速率常数.
- 该CaFe2O4纳米催化剂在多个循环中显示出良好的可重复使用性.
结论:
- CaFe2O4纳米粒子是有效的异质催化剂,可以通过臭氧化增强AOII降解.
- 与单独的臭氧化相比,CaFe2O4/O3系统在降解率和效率方面提供了更高的性能.
- 催化剂的成分 (CaO和FeO) 可能有助于臭氧激活和反应性物种的产生,使其成为废水处理的有希望的材料.
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