ZIF-8用于从采矿废水中选择性回收重稀土元素
Ronghao Wu1, Bengen Hong2, Chao Xue1
1Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350117, Fujian, China.
Environmental science & technology
|May 22, 2024
概括
2-甲基利米达盐 (ZIF-8) 有效地从采矿废水中回收重稀土元素 (REEs). 这种材料具有很高的选择性和超过40%的回收效率,为REE开采提供了一个有前途的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 稀土元素 (REEs) 对现代技术至关重要.
- 稀土采矿的废水含有有价值的稀土,但也含有常见的离子.
- 从复杂的矩阵中选择性回收重重的REEs仍然是一个挑战.
研究的目的:
- 为了研究二甲基利米达盐 (ZIF-8) 对选择性重型REE回收的疗效.
- 了解ZIF-8在实际采矿废水中的重重废弃物吸附机制.
- 为了评估ZIF-8在实践应用的柱体测试中的性能.
主要方法:
- 使用ZIF-8对模拟和真实采矿废水进行批量吸附实验.
- 先进的特征化技术 (例如,DFT计算) 来阐明绑定机制.
- 吸附动力学,同热模拟和热力学分析以了解相互作用.
- 在连续流条件下评估ZIF-8性能的柱体测试.
主要成果:
- 与普通离子 (K+,Mn2+,Ca2+,Mg2+) 相比,ZIF-8对重型REEs (Y3+,Gd3+,Dy3+) 的分布系数较高.
- 沉重的REEs的脱吸效率超过了40%,表明有效的回收.
- DFT计算和实验数据表明,重重的REEs在ZIF-8中与原子的优先结合.
- 吸附是由涉及水解离和REE-O键形成的化学相互作用驱动的.
- 列测试在7小时内实现了重型REE的40%以上的回收效率.
结论:
- ZIF-8表现出极好的选择性和效率,用于从真正的稀土采矿废水中回收重重的REEs.
- 吸附机制涉及强烈的化学相互作用,使ZIF-8成为废水处理和资源回收的有希望的材料.
- 该研究为开发选择性重型REE开采的实际ZIF-8系统提供了有价值的见解.
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