Isotherms for Aqueous potassium Adsorption and Characterization of Natural Pyrophyllite
The present investigatory founded an effectiveness of inexpensive and eco-friendly alumina silicate clay minerals,sericitic pyrophyllite (SP),as an adsorbent for the possible application in the absorption of K+.The crystal structure of pyrophyllite,size and morphology were characterized by XRD and SEM.In addition to pyrophyllite,quartz and were also contained in the minerals.The area oflamellar SP was about dozens um2.The results showed that potassium was absorbed on the SP under different pH and concentrations,and the best condition was pH=6,the time of equilibrium absorption =30 min.It has been found that these natural minerals are effective in removing 55-75% of K+ from 5.0 to 20 mgL-1 KNO3 solutions.The applicability of the Langmuir,Freundlich and Dubinin-Radushkevich adsorption isotherms in each case of potassium was examined separately.We found that the adsorption process was endothermic in the case of SP and the Freundlich adsorption model was to more suitably represent the data.The work could provide the theoretical basis of the study of potassium ions adsorbed by pyrophyllite applying in fertilizer.
Pyrophyllite potassium Langmuir Freundlich Dubinin-Radushkevich
CHEN Haifeng TANG Peisong XU Minhong CAO Feng
Department of Chemistry,Huzhou Teachers College,Huzhou 313000,China
国际会议
大理
英文
682-685
2011-08-18（万方平台首次上网日期，不代表论文的发表时间）