通过提取,使用天然的深溶性溶剂进行ex-situ土壤修复的动力学研究
Shahidah Nusailah Rashid1,2, Hanee F Hizaddin1,2, Adeeb Hayyan1,2,3
1Department of Chemical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia.
Environmental technology
|November 13, 2023
概括
天然深层环氧溶剂 (NADES) 提供了一种绿色解决方案,用于从污染的土壤中提取离子. 基于胆化的溶剂有效地去除了70%以上的,显示了可持续重金属修复的潜力.
科学领域:
- 环境化学环境化学
- 绿色化学 绿色化学
- 土壤修复土壤的修复.
背景情况:
- 污染的红树林土壤由于重金属污染而造成环境风险.
- 传统的金属开采方法往往涉及强化学品,并产生危险废物.
- 天然深层环保溶剂 (NADES) 是一个有前途的环保替代物,可用于去除污染物.
研究的目的:
- 评估三种NADES (ChCl:乙酸,ChCl:酸,ChCl:乙烯糖醇) 在从受污染的红树林土壤中提取离子的有效性.
- 使用NADESs优化操作参数以实现高效的离子溶解.
- 为了研究通过NADESs提取的离子的溶解动力学.
主要方法:
- 选三种由胆化物和有机酸组成的NADESs.
- 批量实验评估洗剂度,pH值和接触时间的影响.
- 应用伪二次和粒子内部扩散模型来解释溶解动力学.
主要成果:
- 对于ChCl:levulinic acid和ChCl:acetic acid的最佳条件涉及特定度,土壤-液体比为1:5和pH2.
- 单次洗周期清除了70.8% (ChCl:酸) 和70.0% (ChCl:酸) 的离子.
- 的最大溶解能力 (Qe) 为ChCl:酸51.56 mg g-1和ChCl:酸52.00 mg g-1.
- 实验数据显示与伪二阶动力模型相匹配.
结论:
- 合成的NADES是有效和高效的提取剂,可以从污染的土壤中提取离子.
- 这些天然溶剂为传统的重金属提取方法提供了经济高效和绿色的替代方案.
- 纳德斯显示了可持续环境修复技术的巨大潜力.
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