鄰苯二甲酸氫鉀對於電容去離子系統脫鹽之影響;Influences of potassium hydrogen phthalate on desalination of capacitive deionization

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题名:	鄰苯二甲酸氫鉀對於電容去離子系統脫鹽之影響;Influences of potassium hydrogen phthalate on desalination of capacitive deionization
作者:	許書瑜;Hsu, Shu-Yu
贡献者:	環境工程研究所
关键词:	碳氣凝膠;電容去離子;有機物;Carbon aerogel;Capacitive deionization;Organic matter
日期:	2017-01-23
上传时间:	2017-05-05 17:44:19 (UTC+8)
出版者:	國立中央大學
摘要:	電容去離子是一種新穎的海水淡化技術。有機質在環境中無所不在且扮演著重要的角色。然而，在以前的電容去離子脫鹽研究中，實驗室主要使用氯化鈉溶液進行初步測試。因此，在本研究中進行了鄰苯二甲酸氫鉀（KHP），氯化鈉（NaCl）和KHP / NaCl對碳氣凝膠的吸附和脫附實驗。並利用Ritchie，Ho-McKay和intra-particle diffusion model三種吸附動力模式，以及Langmuir和Freundlich isotherm兩種等溫吸附模式來對用碳氣凝膠吸附氯化鈉進行模擬。從吸附和脫附實驗結果中可得知，KHP可以完全被電吸附且不能從碳氣凝膠中脫附出來。在平衡時，對於5 mg / L KHP，電容吸附量為約0.54 mg / g，對於10 mg / L KHP，電容吸附量為約1.09 mg / g。 5 mg / L和10 mg/L KHP的鈉離子電容吸附量高於0 mg / L KHP。KHP對鈉離子電吸附的影響取決於初始NaCl的濃度。然而，當NaCl濃度低於50 mg / L時，KHP具有抑制鈉離子吸附的作用。可以看出，有機物對電容去離子系統脫鹽是非常重要的因素。KHP的吸附模式為the Ritchie吸附動力模式，NaCl和KHP/NaCl的吸附模式則為the intra-particle diffusion吸附動力模式和the Temkin等溫吸附模式。;Capacitive deionization (CDI) is an innovative desalination technology. Organic matter is ubiquitous and plays a significant role in the environment. However, the laboratory mostly uses sodium chloride solution to carry out a preliminary test in the past studies of CDI for desalination. In order to understand whether organic matter interferes the desalination performance of CDI. Therefore, CDI experiments of potassium hydrogen phthalate (KHP), sodium chloride (NaCl) and KHP/NaCl on carbon aerogel were conducted in this study. Three kinetic models (Ritchie, Ho-McKay and intra-particle diffusion model) and two isotherm models (Langmuir and Freundlich isotherm) are used to model adsorption of NaCl on carbon aerogel. CDI experiments showed that KHP can be adsorbed completely by electro-sorption, but cannot be desorbed from carbon aerogel. At equilibrium, the maximum adsorption amount of KHP is about 0.54 mg/g for 5 mg/L KHP and about 1.09 mg/g for 10 mg/L KHP. The electro-sorption adsorption amount of 〖"Na" 〗^"+" for 5 mg/L and 10 mg/L KHP are higher than 0 mg/L KHP. The effects of KHP on electro-sorption for NaCl depends upon the concentration of NaCl. However, when the concentration of NaCl is lower than 50 mg/L, KHP has inhibitory effect on adsorption of 〖"Na" 〗^"+" . It can be seen that organic matter is very important factor for the desalination of CDI. The experimental data of KHP has been well fitted with the Ritchie kinetic adsorption model, and the experimental data of NaCl and KHP/NaCl have been fitted with the intra-particle diffusion kinetic adsorption model and the Temkin adsorption isotherm model.
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