改性沸石制备及对其铬吸附特性的研究

为了解决天然沸石对废水中重金属吸附能力低的问题,制备出了六种改性沸石并考察了改性沸石对六价铬离子的吸附特性。在这六种改性沸石中,H2 SO4/CuSO4复合改性沸石对铬的吸附性能最佳,其对铬的吸附曲线符合Freundlich方程；其吸附强度是天然沸石的8倍；其吸附动力学曲线符合二级动力学模型,实测值十分接近理论值,这也证明在其对六价铬离子的吸附过程中离子交换起着十分重要的作用。

Preparation of Modified Zeolites and Their Adsorption Characteristics of Chromium

In order to solve the low adsorption capacity of natural zeolites to heavy metals in wastewater, six kinds of modified zeolites were prepared and the adsorption properties of modified zeolites to hexavalent chromium ions were investigated. Among the six modified zeolites, H2 SO4/CuSO4 composite modified zeolite has the best adsorption performance to chromium. The adsorption curve of chromium is in accordance with Freundlich equation. Its adsorption intensity is 8 times that of natural zeolite. The adsorption kinetic curve accord with the second-order kinetics model. The results show that ion exchange plays an important role in the adsorption of hexavalent chrome ion, which is very close to the theoretical value.