从废水中有效吸附Pb(ii) 使用MnO2加载的MgFe-LD(H) O复合材料:吸附行为和机制
Yongxiang Huang1,2, Xiangping Luo1,2, Chongmin Liu1,2
1College of Environmental Science and Engineering, Guilin University of Technology Guilin 541004 China chongmin@glut.edu.cn youshaohong@glut.edu.cn.
RSC advances
|June 28, 2023
概括
这项研究表明,MnO2/MgFe层金属氧化物 (MnO2/MgFe-LDO) 是一种高效的吸附剂,可以从水中去除. 其强大的吸附能力和再生能力使其成为废水整治的有希望的产品.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学 化学 化学
背景情况:
- 水中的 (Pb) 污染对环境和健康构成重大风险.
- 开发高效和可再生的吸附剂对于有效的废水整治至关重要.
- 层状双氧化物 (LDH) 和它们的衍生层状金属氧化物 (LDO) 显示了重金属去除的潜力.
研究的目的:
- 实验性地研究MnO2/MgFe层双氧化物 (MnO2/MgFe-LDH) 和MnO2/MgFe层金属氧化物 (MnO2/MgFe-LDO) 的吸附特性和机制.
- 使用这些材料来确定Pb的最佳吸附条件.
- 探索MnO2/MgFe-LDO作为废水处理的可再生吸附剂的潜力.
主要方法:
- 进行了实验室规模的批量吸附实验.
- 应用了吸附等温 (Langmuir, Freundlich),动力学 (伪第一阶,伪第二阶,Elovich) 和热力学模型.
- 进行了材料表征,以阐明吸附机制.
主要成果:
- 在400°C烧焦的MnO2/MgFe-LDO (MnO2/MgFe-LDO400°C) 与MnO2/MgFe-LDH相比,表现出更高的Pb(ii) 吸附能力.
- 对于MnO2/MgFe-LDO400 °C的吸附数据最适合弗洛伊德利希,伪二阶和埃洛维奇模型,表明化学吸附.
- MnO2/MgFe-LDO400 °C的最大吸附能力为531.86 mg g-1,在五个周期内具有很好的再生能力.
结论:
- MnO2/MgFe-LDO400 °C是一种高效的吸附剂,用于从水溶液中去除Pb.
- 吸附机制涉及沉,复杂化,静电吸引,阴离子交换,同态替换和记忆效应.
- 这些发现表明MnO2/MgFe-LDO400 °C是一种有前途的纳米结构吸附剂,用于废水整治.
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