Adsorption mechanism of recovering potassium from seawater by modified-clinoptilolite using microwave

Journal of Water Reuse and Desalination

Yuan, He-Tao¹  Peng, Chang-Sheng²  Zhang, Fan²  Jiang, Jian-Yun³  Guo, Hao⁴  Kou, Chang-Jiang⁴ 

[1] Beijing Association of Sustainable Development, Beijing 100084, China;Beijing Institute of High-tech Environmental Science, Beijing 101111, China;CSD (Beijing) Environmental Protection Development Co., Ltd, Beijing 100192, China;Key Laboratory of Marine Environment and Ecology, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China E-mail:

关键词: adsorption amount;    isotherm;    kinetics;    modified-clinoptilolite;    potassium;    thermodynamic parameters;   

DOI  :  10.2166/wrd.2017.108

学科分类：工程和技术（综合）

来源: IWA Publishing

【 摘 要 】

The adsorption capacity and mechanism of K+ ion onto modified-clinoptilolite (MC) for recovering potassium from seawater has been investigated in this paper. The maximum value of K+ adsorption capacity is 36.3 mg/g (1.92 times of raw-clinoptilolite) while the modifying condition of microwave power is 450 W and heating time is 60 min. Specific surface area and pore size of absorbent has also been advanced with employing microwave. The kinetic data followed the pseudo-second-order model kinetic model, and the equilibrium data were well fitted to the Langmuir model, showing monolayer coverage of K+ ions on the surface pores of MC. Thermodynamic parameters, including Gibbs free energy (∆G), enthalpy changes (∆H), and entropy changes (∆S) were also calculated. The results demonstrated that K+ ion was absorbed onto MC spontaneously and exothermically in nature. Thus, MC could be employed as efficient and suitable adsorbent for recovering potassium from seawater.

【 授权许可】

CC BY-NC-ND