高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 240.

• Chemistry in Materials Sciences • 上一篇    下一篇

Study on K+/H+ Exchange for K2O·4TiO2

LU Xiao-Hua, BAO Ning-Zhong, JI Xiao-Yan, FENG Xin   

  1. Nanjing University of Chemical Technology, Nanjing 210009
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 基金资助:

    The author thanks the Outstanding Youth Fund of NNSF of P. R. China (29925616).

Study on K+/H+ Exchange for K2O·4TiO2

LU Xiao-Hua, BAO Ning-Zhong, JI Xiao-Yan, FENG Xin   

  1. Nanjing University of Chemical Technology, Nanjing 210009
  • Online:2000-12-31 Published:2000-12-31
  • Supported by:

    The author thanks the Outstanding Youth Fund of NNSF of P. R. China (29925616).

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摘要：

Potassium tetratitanate (K2O·4TiO2) is an artificial mineral whisker with the diameter of 0.5-1 μm and the length 5-20 μm. The interlayered potassium ion exchange reaction for the K2O·4TiO2 whisker results in the appearance of many new nonstoichiometric metal titanate whiskers M2O·nTiO2 (M are K, H, Na, Cs, Ba, Ru, Co or Pb, etc.). Through the K+-H3O+ exchange in solutions,TiO2 and K2O·6TiO2 whiskers were synthesized. Generally, the target product quality and yield are greatly affected by the ion exchange conditions. The optimal synthetic conditions are difficult to obtain. In this paper, a new method was proposed to control the ion-exchange process by applying the ion-exchange reaction thermodynamics and combining with monitoring the multi-ions concentrations with ISE. Ion-exchange thermodynamic model for potassium tetratitanate whisker (K2O·4TiO2) was established, and model parameters were calculated through the existent experimental equilibrium data. Ion selective electrode achieved the on-line monitor for K+/H+ exchange and the equilibrium point was judged. The calculation for the accurate ion concentration was done through the Pitzer equation. Based on the proposed method, the ion-exchange process was controlled and the optimal synthesis conditions could be obtained.

Abstract:

Potassium tetratitanate (K2O·4TiO2) is an artificial mineral whisker with the diameter of 0.5-1 μm and the length 5-20 μm. The interlayered potassium ion exchange reaction for the K2O·4TiO2 whisker results in the appearance of many new nonstoichiometric metal titanate whiskers M2O·nTiO2 (M are K, H, Na, Cs, Ba, Ru, Co or Pb, etc.). Through the K+-H3O+ exchange in solutions,TiO2 and K2O·6TiO2 whiskers were synthesized. Generally, the target product quality and yield are greatly affected by the ion exchange conditions. The optimal synthetic conditions are difficult to obtain. In this paper, a new method was proposed to control the ion-exchange process by applying the ion-exchange reaction thermodynamics and combining with monitoring the multi-ions concentrations with ISE. Ion-exchange thermodynamic model for potassium tetratitanate whisker (K2O·4TiO2) was established, and model parameters were calculated through the existent experimental equilibrium data. Ion selective electrode achieved the on-line monitor for K+/H+ exchange and the equilibrium point was judged. The calculation for the accurate ion concentration was done through the Pitzer equation. Based on the proposed method, the ion-exchange process was controlled and the optimal synthesis conditions could be obtained.

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