刚果红和结晶紫在锯末上的吸附性能研究

采用静态吸附法研究了刚果红和结晶紫在锯末上的吸附特性。结果表明,锯末是具有高脱色率的廉价吸附剂,最大脱色率可达96%。在pH4~10范围内,酸度对结晶紫的吸附影响较小,随着pH值增大,脱色率从96.6%缓慢降至91.1%。pH值对刚果红吸附影响较大,pH从4增大到7,脱色率迅速从22.5%增加至96.0%,然后,随pH值升高脱色率缓慢下降至91.4%。两种染料在锯末上的吸附等温线均较好的符合Freundlich方程,吸附动力学可以用拟二级动力学模型描述。计算了相应的吸附等温线参数和吸附动力学参数。

ADSORPTION CHARACTERISTIC OF CONGO RED AND CRYSTAL VIOLET ONTO SAWDUST

The adsorption characteristics of Congo red and crystal violet onto sawdust were investigated by static adsorption method.The result shows that the sawdust is effective low cost adsorbent with high removal of dyes.The best percent color removal of these two dyes is about 96%.The crystal violet adsorption by sawdust is almost unaffected by pH in the range 4-10.With the increase of pH,the color removal decreases slowly from 96.6% to 91.1%.The system pH plays significant role in Congo red adsorption.As pH increase from 4 to 7,the color removal increases rapidly from 22.5% to max 96.0%,and then decreases slowly to 91.4% as the increase of pH.The adsorption isotherm of two dyes can be well fitted the Freundlich equation.The adsorption kinetics can be well described by the pseudo-second order kinetics model.The parameters of adsorption isotherm and kinetics are calculated.