改性粉煤灰合成沸石对甲基橙的吸附动力学

Adsorption kinetics of methyl orange on modified zeolite synthesized from fly ash

以粉煤灰(FA)为原料,采用水热晶化一步法制备了Na P1型沸石(ZFA),对合成产物的结构进行了表征,并采用阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)对其进行改性。通过静态吸附实验,研究了改性后Na P1型沸石(MZFA)对水溶液中甲基橙的吸附特性,从动力学角度探讨了吸附机理。结果表明,在所研究的浓度条件下,改性Na P1型沸石对甲基橙的吸附符合Langmuir等温吸附方程,在25℃时,静态饱和吸附量(Qm)为64.76 mg/g。动力学分析表明,改性Na P1型沸石对溶液中甲基橙的吸附符合准二级动力学模型。

Na P1 zeolite( ZFA) was systhesised by one-step hydrothermal crystallization method using Fly ash( FA) as raw material. The prepared products were characterized and modified by cationic surfactant cetyltrimethylammonium bromide ammonium( CTAB). The adsorption properties of modified Na P1 zeolite( MZFA) to methyl orange in aqueous solution were studied through static adsorption experiments and the adsorption mechanism was also discussed from the point of kinetic. The equilibrium adsorption data were fitted to Langmuir isotherm and the greatest adsorption capacity of methyl orange was 64. 76 mg / g at 25℃ under the given concentration. Kinetic analysis showed that the adsorption process of modified Na P1 zeolite to methyl orange in aqueous solution followed the pseudo-second-order kinetic model.