活化煤矸石对水中亚甲基蓝吸附行为的研究

Adsorption of Methylene Blue from Aqueous Solution on Activated Coal Gangue

采用批量吸附实验,研究了活化煤矸石对水中亚甲基蓝的吸附行为。结果表明,活化煤矸石能有效地吸附水中的亚甲基蓝。利用Freundlich等温吸附方程和Langmuir等温吸附方程对其吸附进行描述,表明活化煤矸石易于吸附亚甲基蓝,吸附属于化学吸附,吸附过程是放热反应;用颗粒内扩散方程、准二级吸附动力学方程和准一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活化煤矸石上的吸附;根据Arrhenius方程得出该吸附的表观活化能为88.14 kJ/mol。

The adsorption of methylene blue from aqueous solutions on activated coal gangue was investigat - ed in a batch - adsorption experiments. The results revealed that activated coal gangue was a promising sorbent for the removal of methylene blue from aqueous solutions. The adsorption mechanism was discussed based on Freundlich isotherm and Langmuir isotherm. It is proved that methylene blue easy to be adsorbed by activated coal gangue and the adsorption is chemisorption and exothermic in nature. The intra - particle diffusion, pseudo - second - order kinetic and pseudo - first - order kinetic equations have been used to test experimental data, pseudo - second - order kinetic equation provided the best fit. The apparent activation energy of the adsorption was 88. 14 kJ/mol according to Arrhenius equation.