低品位硅藻土对有机染料的吸附性能

考察低品位硅藻土对两种有机染料碱性桃红和直接墨绿的吸附性能,通过对吸附平衡时间、吸附剂质量浓度、温度、pH值等对硅藻土吸附性能影响的研究,建立了硅藻土对上述两种有机染料进行静态吸附的吸附等温式.实验结果表明:硅藻土对碱性桃红和直接墨绿的吸附均较迅速,两种染料在硅藻土上的吸附动力学过程符合准二级动力学方程;温度对吸附的影响不大;酸性条件更有利于硅藻土对碱性桃红和直接墨绿的吸附;Freundlich和Langmuir吸附等温式均能较好地描述两种染料在硅藻土上的吸附,碱性桃红的理论饱和吸附量为104.1mg/g,直接墨绿的理论饱和吸附量为14.98mg/g.

Adsorption of Organic Dyes onto Low-Grade Diatomite

The authors researched the performance of the low grade diatomite adsorbing two organic dyes(Basic Pink and Direct Green B) and the effects of adsorbing time, adsorbent concentration, temperature and pH on the adsorption of the two organic dyes onto the diatomite. Moreover, the adsorption isotherms of the dyes on the diatomite were investigated. The results show that theadsorption of Basic Pink and Direct Green B onto the diatomite is a quick process, and the pseudo second order model provides a very good fitting for it. Thetemperature has little effect on the adsorption, but the acidic situation favors the process. Both Freundlich and Langmuir model can describe the adsorption well. The maximum adsorption capacity of Basic Pink onto diatomite, calculated by Langmuir model, is 104.1 mg/g, and that of the Direct Green B’s is 14.98 mg/g.