通过与MoS4(2-) 离子相间叠加的双氧化物高度选择性和有效地去除重金属
Lijiao Ma1, Qing Wang1, Saiful M Islam2
1Beijing Key Laboratory of Energy Conversion and Storage Materials and College of Chemistry, Beijing Normal University , Beijing 100875, China.
Journal of the American Chemical Society
|February 2, 2016
概括
一种新型的-层双与MoS42-) 离子 (MgAl-MoS4-LDH) 间隔,有效地从水中去除有毒的重金属,如Hg2+和Ag+. 这种材料具有很高的选择性和快速吸附性,使其成为水处理的有希望的材料.
科学领域:
- 材料科学
- 环境化学
- 纳米技术
背景情况:
- 水中的重金属污染对环境和健康构成重大风险.
- 开发高效和选择性的吸附材料对于水处理至关重要.
- 层状双化物 (LDH) 为开发新型吸附剂提供了可调节的平台.
研究的目的:
- 合成和描述一种新型的MoS4(2-) 层双氧化物 (MgAl-MoS4-LDH).
- 评估MgAl-MoS4-LDH从水溶液中去除各种重金属离子的效率和选择性.
- 研究合成材料的吸附机制和稳定性,用于实际的水处理应用.
主要方法:
- 将MoS4(2-) 离子插入层的双氧化物 (MgAl-NO3-LDH) 前体.
- 使用X射线衍射 (XRD) 进行合成的MgAl-MoS4-LDH材料的表征.
- 批量吸附实验以确定重金属去除效率,选择性,吸附等热量和动力学.
- 在不同的pH条件下测试材料的稳定性.
主要成果:
- 一个单相MgAl-MoS4-LDH材料成功合成,具有高选择性和重金属去除效率.
- 该材料对Hg2+ (∼500 mg/g) 和Ag+ (450 mg/g) 具有异常的吸附能力,分布系数 (Kd) 约为∼10~7 mL/g.
- 从ppm到ppb以下的水平实现了Cu2+ ,Pb2+ ,Hg2+ 和Ag2+的快速和选择性去除,在5分钟内去除了97%的Hg2+.
- 吸附遵循了兰姆尔和伪二阶模型,表明单层化学吸附通过MS结合.
- 该材料在2-10的pH范围内表现出极好的稳定性.
结论:
- MgAl-MoS4-LDH是一种高效的吸附剂,用于从污染水中去除有毒的重金属.
- 这种材料的高选择性,快速运动性和优异的稳定性使其成为实际水处理的有希望的候选者.
- 在有效捕获重金属离子方面,MS结合机制起着关键作用.
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