基于PVA的电旋纳米纤维膜用于从水中吸附性去除PFAS
Md Nahid Pervez1, Tao Jiang1, Boyu Li1
1Department of Environmental and Sustainable Engineering, University at Albany, State University of New York, Albany, New York 12222, United States.
概括
这项研究开发了一种使用PVA和CTAC的电纳米纤维膜,以有效地去除per-和多基物质 (PFAS). 这种新型膜实现了近100%的PFAS从水中捕获,证明了其对环境修复的潜力.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
背景情况:
- 和多醇基物质 (PFAS) 是持久性有机污染物,具有广泛的环境和健康问题.
- 吸附是一种有效的方法,可以从污染的水源中去除PFAS.
研究的目的:
- 开发和描述一个电纳米纤维膜,以有效地去除PFAS.
- 为了研究PFAS对修饰膜的吸附动力学,同热量和机制.
主要方法:
- 聚乙醇 (PVA) 和 cetyltrimethylammonium chloride (CTAC) 的电,以创建纳米纤维膜.
- 吸附实验使用10个目标PFAS在脱离离子水中的10μg/L.
- 动力和同热模型 (伪二次和托斯模型).
- 热力学分析和物理化学表征.
主要成果:
- 经过修改的PVA膜实现了近100%的消除所有10个目标PFAS.
- 吸附动力学遵循伪二次模型,在60秒内迅速吸收.
- 托斯等温模型最好地描述了吸附数据,表明了复杂的相互作用.
- 膜在雨水中显示出高的去除效率 (90-100%),在不同的pH值和自然有机物质中具有稳定性.
结论:
- 包含PVA和CTAC的电纳米纤维膜在PFAS去除方面非常有效.
- 吸附过程涉及静电和疏水相互作用,具有快速的动力学和复杂的异热态行为.
- 开发的膜在真实水矩阵中表现出强大的性能,突出了其在实际PFAS整治方面的潜力.
相关概念视频
Water: A Bronsted-Lowry Acid and Base
58.5K
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
58.5K
Water and Mineral Acquisition
35.7K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
35.7K
Analyte Adsorption and Distribution
2.8K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
2.8K
States of Water
56.8K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
56.8K
Ions as Acids and Bases
26.4K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.4K
Cationic Chain-Growth Polymerization: Mechanism
2.9K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.9K


