Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (07): 667-671.doi: 10.3866/PKU.WHXB20000717

• Note • Previous Articles    

Adsorptive Model and Isotherm of Water on Ettringite

Guo Zi-Cheng, Sun Shu-Qiao, Li Jian-Jun, Chen Xian-Tuo   

  1. Department of Chemical Engineering,Heibei University of Science and Technology,Shijiazhuang 050018
  • Received:1999-10-18 Revised:2000-02-16 Published:2000-07-15
  • Contact: Guo Zi-Cheng


The adsorption isotherm of water on ettringite was determined by an automatic microelectronic thermobalance. The adsorptive behavior of water on ettringite was analyzed by the experimental results. A modified Langmuir model of adsorption was used and the isotherm equation was derived. A characteristic equation for adsorption of water on ettringite was obtained by simulation with experimental data. Each adsorption isotherm at temperature 10-40 ℃could be derived conveniently from the characteristic equation.

Key words: Ettringite, Water adsorption, Model, Isotherm equation, Characteristic equation