氢氧化铁溶胶制备条件对其电泳等性能的影响

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

系统研究了Fe(OH)3溶胶制备过程中FeCl3用量、水解温度以及渗析时间等制备条件对溶胶粒径、电导率、pH和双电层电位的影响。运用紫外可见分光光度计-反射法研究溶胶胶粒的粒径,结果表明,随着FeCl3浓度的增加,胶体的粒径逐渐增大,光谱反射率逐渐减小,反射波长逐渐红移,符合量子限域效应理论。过量的Cl?对溶胶体系的电导率起到抑制作用,粒径越大的Fe(OH)3溶胶体系稳定性越差。在优化条件下cFeCl3为0.01 mol?L?1、水解温度100°C,渗析时间为1 d时,制备所得的Fe(OH)3溶胶在电场作用下的核质比(q/m)与积距比(v/l)最佳,测定所得的双电层电位ζ与理论值(44.00 mV)误差最小。

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,theζof the Fe(OH)3 sol prepared under the optimum conditions(cFeCl3,0.01 mol?L?1;100°C;dialysis time,1 d)was 43.67 mV which was most close to the theoretical value of 44.00 mV.