钠基累托石对模拟废水中Ni^(2+)的吸附研究

Study on the Sorption of Ni^(2+) onto Na-rectorite from Simulated Wastewater

研究了不同因素对钠基累托石吸附金属Ni^(2+)效果的影响。结果表明,伪二级动力学速率方程能很好拟合吸附动力学数据;体系pH值对吸附速率有较大影响,在低pH值吸附体系中,胡敏酸(HA)和富里酸(FA)的存在增强了钠基累托石对金属Ni^(2+)的吸附能力。热力学数据证明该吸附过程是自发的、吸热的、无序的。Ni^(2+)在钠基累托石上的吸附主要集中在样品的表面或者边缘,吸附前后钠基累托石的晶体结构未发生较大变化。钠基累托石是一种较好的Ni^(2+)吸附剂。

The removal of Ni^2+from aqueous solutions by Na-rectorite was investigated by batch technique under ambient conditions.The results showed that a pseudo-second-order rate equation simulated well of the kinetic sorption.Solution pH had great impact on the sorption percentage.A positive effect of humic acid(HA)and fulvic acid(FA)on the sorption of Ni^2+can be observed at low pH values.Thermodynamic data indicated that the adsorption process was spontaneous and enhanced at higher temperature.Spectroscopic analysis indicated the sorption of Ni^2+mainly occurred on the surface and edge position of Na-rectorite.Na-rectorite was a suitable sorbent in the remove of Ni^2+from solutions.