摘要
研究了大孔交联聚甲基丙烯酸酯树脂(相当于Amberlite-XAD-7)吸附和解吸AuCl4-的动力学.结果表明,两种过程均由液膜扩散转向粒内扩散主控.
The kinetics of adsorption and desorption of AuCl4-on maororecticular polyacry-late resin(analogous to Amberlite XAD-7)has been studied.It is shown that the ratedetermining step in both processes is film diffusion at initial stage then turning intoparticle diffusion.The effect of HCl concentration on the adsorption process of AuCl4-is insignificant,DAuCl4-=4.4×10-8cm-2·S-1 at 25℃and adsorption activation energy⊿Ea=-13.0 kJ·mo1-1.The kinetics of desorption process using HCl-thiourea asdesorption agent was studied.It is shown that the relation between liquid film diffusionconstant R and particle diffusion constant B with resin particle radius r0 follows Boydequation.
出处
《化学学报》
SCIE
CAS
1988年第10期945-951,共7页
Acta Chimica Sinica
