University Chemistry ›› 2019, Vol. 34 ›› Issue (7): 79-84.doi: 10.3866/PKU.DXHX201901033

• Chemistry Laboratory • Previous Articles     Next Articles

Effects of Preparation Conditions on Electrophoresis and Other Properties of Iron Hydroxide Sol

Hongying CHENG,Siyu XIA,Yujie ZHOU,Jie WEI,Yanmao DONG*()   

  • Received:2019-01-24 Published:2019-04-01
  • Contact: Yanmao DONG
  • Supported by:
    苏州市重点产业技术创新(前瞻性应用研究, SYG201744)


In order to explore the optimum preparation conditions, effects of FeCl3 dosage, hydrolysis temperature and dialysis time on the particle size, conductivity, pH and double layer potential (ζ) of Fe(OH)3 sol were systematically studied. The ultraviolet-visible reflection spectrophotometry was used to track the particle size of Fe(OH)3 sol. With the increase of FeCl3 dosage, the particle size of the colloid increased, the reflectivity decreased and the reflection wavelength shifted to longer wavelength, which is in accordance with the quantum confinement effect theory. The excessive Cl- would inhibit the conductivity, and the stability of Fe(OH)3 sol with larger particle size would be worse. Because of the better synergistic effect of q/m and V/l under the action of electric field of 80 V with electrophoresis, the ζ of the Fe(OH)3 sol prepared under the optimum conditions (cFeCl3, 0.01 mol·L-1; 100℃; dialysis time, 1 d) was 43.67 mV which was most close to the theoretical value of 44.00 mV.

Key words: Fe(OH)3 sol, Dialysis, Electrophoresis, Particle size of Sol, Reflectivity


  • G64