通过Fe/CN宽桥介导的Cr (VI) 和有机酸之间的有效电子传递
Li Song1, Weiguo Zhang2, Quan Liu2
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, PR China; College of Environment and Ecology, Jiangsu Open University, Nanjing, 210036, PR China.
Environmental research
|August 23, 2025
概括
含铁的碳化物复合物有效地从废水中去除 (VI) 和酸盐,形成光活性复合物,增强电子转移并减少污染物降解的激活能量.
科学领域:
- 环境化学
- 材料科学
- 催化剂
背景情况:
- 六价 (Cr(VI)) 和有机酸是废水中常见的共存污染物.
- 在CrVI和有机酸之间直接的电子转移是缓慢的,阻碍了有效的整治.
- 现有的铁基介质在有效的铁回收和Cr6去除方面扎.
研究的目的:
- 开发一种有效的去除复合 (VI) 和酸盐 (Cit) 污染物的方法.
- 通过使用含铁的碳化物 (Fe/CN) 复合材料来研究增强的Cr (VI) 降解机制.
- 评估合成的Fe/CN材料的稳定性和可重复使用性.
主要方法:
- 通过负荷加方法合成含铁的碳化物复合材料 (Fe/CN).
- 在照射下,酸盐和Fe/CN之间的光活性复合物形成的特征.
- 研究电子转移途径,包括连接物到金属电荷转移 (LMCT) 和激素生成.
- 评价Cr (VI) 减少动力学,激活能量和铁液.
主要成果:
- 铁/CN复合物形成了光活性Fe (III) -Cit复合物,显著增强了固态Fe (III) /Fe (II) 循环.
- 达到0.213 mg/L·min的CrVI减速常数,并减少了81.3%的激活能量.
- 由于与富含的基质进行协调,使铁出量降至最低 (<0.5 mg/L).
- 在实际废水中,在5个循环中显示出高的Cr (VI) 清除效率 (~90%).
结论:
- 铁/复合材料提供了一个有前途的解决方案,用于成本效益高的Cr (VI) -有机酸复合污染物.
- 光活性复合体的形成和增强的电子转移是有效的CrVI降解的关键机制.
- 该材料具有良好的稳定性和可重复使用性,使其适用于现实世界废水处理应用.
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