改性煤矸石吸附亚甲基蓝的研究

Study on Adsorption of Methylene Blue by Modified Coal Gangue

以改性煤矸石对亚甲基蓝进行吸附实验,探讨了改性煤矸石用量、吸附时间对亚甲基蓝吸附的影响,并对改性煤矸石再生效果进行测定。结果表明,利用改性煤矸石处理亚甲基蓝,具有处理效果好、再生容易等特点。利用Freundlich等温式和Langmuir等温式对其吸附进行描述,表明改性煤矸石易于吸附亚甲基蓝,吸附属于化学吸附;用颗粒内扩散方程和准二级吸附动力学方程对实验数据进行回归分析,准二级吸附动力学方程能更好地描述亚甲基蓝在改性煤矸石上的吸附。

The adsorption of methylene blue by modified coal gangue was studied. The influences of quantity of modified coal gangue and adsorption time on the adsorption effect of methylene blue were observed, and the effectiveness of regenerated modified coal gangue was assayed. The results show that was successful in treating wastcwatcr containing methylene blue by modified coal ganguc, and its regeneration procedure is easy, simple and efficient. The adsorption mechanism was discussed based on Frcundlich isotherm and Langmuir isotherm. It is proved that methylene blue easy to be adsorbed by modified coal gangue and the adsorption is chcmisorption, The intra-particlc diffusion model and pseudo-second-order kinetic model have been used to test experimental data, pseudo-second-order kinetic model is provided the best fit.