铁剂增强了基吸附剂的Cr (VI) 吸附效率:吸附行为和内部去除机制
Bing Hou1, Xinyu Yang1, Ling Wang1
1Key Laboratory of Eco-chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, Qingdao University of Science and Technology, College of Environment and Safety Engineering, Qingdao 266042, PR China.
铁兴奋剂增强基吸附剂 (CeFe@C) 以有效地从废水中去除六价 (Cr(VI)). 这些修改后的吸附剂显示出更好的容量和再生能力,提供了一个具有成本效益的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 纳米技术纳米技术
背景情况:
- 基吸附剂由于其独特的特性,显示出对六价 (Cr(VI)) 吸附的前景.
- 然而,高成本和不稳定性限制了它们在废水处理中的实际应用.
- 开发具有成本效益和稳定的吸附剂对于Cr (VI) 整治至关重要.
研究的目的:
- 合成和研究具有不同/铁比率的双金属-铁吸附剂 (CeFe@C).
- 为了评估铁兴奋剂对Ce@C.的Cr (VI) 吸附性能的影响.
- 了解增强吸附特性背后的机制.
主要方法:
- 合成CeFe@C双金属吸附剂,控制与铁的比率.
- 批量吸附实验以评估Cr (VI) 清除效率和吸附能力.
- 吸附-脱附循环试验,以评估再生性能.
- 密度函数理论 (DFT) 计算以阐明吸附机制.
主要成果:
- 与原始的Ce@C相比,CeFe@C吸附剂显著改善了Cr (VI) 的去除.
- 在25°C时最大吸附能力达到75.11mg/g.
- CeFe@C表现出良好的再生特性,在五个循环后,容量仅下降了25%.
- 铁兴奋剂与增加的Ce (III) 含量和氧空缺正相关,增强电子转移和降低吸附能量障碍.
结论:
- 铁剂有效地提高了基于Ce的吸附剂的Cr (VI) 吸附性能和再生稳定性.
- 性能提升归因于电子转移和表面缺陷调节的增强.
- 这项研究强调了低成本,低毒性的CeFe@C吸附剂在含有Cr (VI) 的废水处理中的潜力.
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