用离子印制的奇托桑珠,用于核废水处理应用的高度选择性吸附
Yassmin Handulle Ismail1,2, Kean Wang3, Maryam Al Shehhi2,4
1Chemical Engineering Department, Khalifa University of Science and Technology, P.O. Box 127788 Abu Dhabi, United Arab Emirates.
Heliyon
|February 6, 2024
概括
从核废水中去除放射性的过程至关重要. 离子印制的奇托桑珠子,特别是含有二氧化纳米颗粒的奇托桑珠子,显著提高了化吸附能力和选择性,提供了具有成本效益的解决方案.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 放射性离子是核废水中的危险污染物.
- 有效地去除化物对于防止其释放到环境中至关重要.
- 酸盐珠提供了成本高效的吸附剂,但缺乏对的选择性.
研究的目的:
- 为了合成和评估具有离子印记的奇托珠 (IIC),以提高的去除效果.
- 为了研究修改 (epichlorohydrin 和二氧化纳米颗粒) 对吸附性能的影响.
- 阐明去除的吸附机制和动力学.
主要方法:
- 通过相逆转合成有离子印记的奇多珠 (IIC).
- 用化 (IIC-EPI) 和二氧化纳米颗粒 (IIC-SiO2-EPI) 修改IIC珠子.
- 批量吸附实验,使用扫描电子显微镜进行表征,以及动态/异热模拟.
主要成果:
- IIC珠子显示出较高的吸附能力 (0.65 mmol g-1) 对化物比非印花珠子 (0.27 mmol g-1).
- 经过修改的IIC-EPI和IIC-SiO2-EPI珠子显示出进一步增强的容量,分别为0.72和0.91 mmol g-1.
- 吸附遵循弗洛伊德利希等温和和伪二阶动力学,表明多层扩散和粒子内部孔扩散机制.
结论:
- 离子印制的奇托珠,特别是当用SiO2纳米颗粒修饰时,对于从废水中去除极为有效.
- 与未经修改的奇多相比,开发的吸附剂提供了更好的选择性和容量.
- 该研究提供了一种有希望的,具有成本效益的核废水整治战略.
相关概念视频
01:09Ion-Exchange Chromatography
496
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
496
01:17Ion Exchange
592
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
592