伊利石合成沸石相吸附材料及对水中Ni2+ 的吸附

以伊利石-石灰石-石膏焙烧活化物为前驱体,采用水热法成功合成了沸石相吸附材料(ZAM),通过XRD和SEM表征其微观结构并考察了其对水溶液中Ni2+的吸附性能,结果表明,制备ZAM的较佳工艺条件为:硅铝比2.0,水热反应温度150℃,水热反应时间4h.此条件下合成的ZAM对Ni2+有较强的吸附性能,在温度25℃,pH值为6时,ZAM吸附Ni2+在180 min内达到平衡,吸附剂的较佳投加量为0.4 g/L、较大吸附量为121.21 mg/g,吸附过程符合拟二级动力学方程和Freundllich吸附模型,为以离子交换为主的多分子层的化学吸附.

Adsorption of Ni2+ from aqueous solutions by zeolite phase adsorption materials synthesized from illite

Zeolite phase adsorption materials (ZAM) were successfully synthesized from calcined treatment of a solid-state mixture containing illite, limestone and gypsum as the precursor by hydrothermal method. Their microstructures were characterized by XRD and SEM, and their adsorption characteristics for Ni2+ in aqueous solutions were studied. The results showed that the optimal conditions for the preparation of zeolite phase adsorption materials were: the ratio of silicon to aluminum of 2.0, hydrothermal reaction temperature of 150 oC and hydrothermal reaction time of 4 h. Testing at a temperature of 25 oC and solution initial pH value of 6 showed that the adsorption process of Ni2+ by the optimum zeolite phase adsorption materials reached equilibrium within 180 min. The maximum adsorption amount of zeolite phase adsorption materials for Ni2+ could reach 121.21 mg/g at the optimal dosage of 0.4 g/L. The adsorption of Ni2+ by ZAM was in accordance with the pseudo second-order kinetic equation and the Freundlich isotherm adsorption model, which proved that adsorption was dominated by ion exchange and multi-layer chemical adsorption.