超细煤粉吸附苯胺机理研究

Mechanism of aniline adsorption on ultrafine coal powder

采用筛分和高能球磨得到不同粒度煤粉,进行吸附试验研究。结果表明,粒度较大的四种煤粉对苯胺的吸附符合La-gergren一级吸附速率方程,较小的三种超细煤粉对苯胺的吸附符合二级吸附动力学方程。并求出了一级、二级吸附速率常数和有效扩散系数,表明煤粉吸附苯胺的过程由颗粒内扩散控制;煤粉对苯胺的吸附量随煤粉粒径的减小呈指数关系增加。平均粒径d50为9.30μm、4.28μm、和4.82μm煤粉对苯胺的吸附符合Langmu ir吸附等温式,单层饱和吸附容量为109.05×10-3、246.31×10-3和90.91×10-3。超细煤粉对苯胺的吸附性能量明显好于其他煤粉。

Seven Shenfu coal powders with different were used for adsorption tests to probe the adsorption especially the ultrafine ones. The results show that the particle sizes were obtained by sieving or ball mill. They properties of aniline on different granularity coal powders, adsorption kinetics of aniline on 4 coal powders with larger particle size fit well Lagergren first-order model, while the other 3 powders with smaller size follow the secondorder model. The dynamics parameters and the effective diffusion coefficients of aniline adsorption on coal powders were calculated. The adsorption process is governed by inner diffusion of the particles. Aniline adsorption capacity exponentially increases with decreasing mean diameter （ dso ） of coal powder. The adsorption equilibrium of coal powders （ mean diameter d50： 9.30μm, 4.28μm and 4.82μm） can be described in terms of Langmuir isotherm, and the maximum amount to form a complete monolayer on the surface is 109.05 × 10^ -3,246.31 ×10 ^-3 and 90.91 ×10 ^-3, respectively. The adsorption capacity of ultrafine coal powders is much better than that of normal coal powder.