泰国纳孔拉查西马地下水的海水淡化,采用膜电容脱离离子
Kunchaya Thungsuai1, Eknarin Thanayupong1, Nuttaporn Pimpha1
1National Nanotechnology Center, National Science and Technology Development Agency, Thailand Science Park, Pathum Thani, Thailand.
概括
使用子的活性炭进行膜电容脱离离 (MCDI) 有效地淡化水地下水. 水友电极表面和离子电荷/大小是安全饮用水高性能的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 电化学 电化学 电化学
背景情况:
- 地下水的盐度是泰国纳孔拉查西马等地区的一个重要问题.
- 传统的海水淡化方法可能昂贵且耗费大量能源.
- 膜容量脱离离子 (MCDI) 为水处理提供了一个有希望的替代方案.
研究的目的:
- 制造和评估一个单通道MCDI堆单元,用于本地水地下水淡化.
- 为了研究活性炭电极特性对电吸性能的影响.
- 评估MCDI装置在从地下水中去除盐度和硬度方面的效率.
主要方法:
- 制造一个大型 (80对) 的MCDI堆单元,具有16x16厘米的活性面积.
- 使用基于子的商业活性炭 (PAC) 作为电极材料,具有不同的特定表面积 (1153 和 2145 m2/g).
- 基于电吸能力,去除效率 (REtotal,REion) 和相对选择系数 (RSC) 的性能评估.
主要成果:
- 更高的电吸性能是通过更适合水的PAC表面和更低的内部电阻实现的,无论特定的表面积如何 (鉴于相似的孔隙结构).
- 科拉特地下水中的MCDI装置显示了足够的盐度 (TDS ~ 2000 mg/L) 和硬度的去除效率.
- 相对选择性系数表明,具有较小水合离子半径的高电荷离子对去除效率至关重要,初始度显著影响具有相同电荷的离子.
结论:
- 基于PAC的MCDI堆单元在单通模式下对水地下水淡化有效.
- 电极材料的水友性和离子特性 (电荷,大小) 是MCDI性能的关键因素.
- 该MCDI系统生产了符合可接受消费标准的净化水,在20天内表现稳定.
相关概念视频
01:15Dialysis
596
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
596
01:15Potentiometry: Membrane Electrodes
459
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
459
01:30Capillary Electrophoresis: Applications
336
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
336
01:17Ion Exchange
553
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...
553