Research on Adsorption Characteristics of Chromium on Natural and Modified Zeolite

Isothermal adsorption methods were used to investigate adsorption effects of chromium( Ⅵ). The adsorption was tested under laboratory conditions, as a function of temperature and shaking time. The results of this research show that the H2SO4+Cu SO4 modified zeolite has the highest adsorption of chromium; under chromium concentration ≤ 25 mg/L, adsorption rate increases from 79.844% up to 94.312%, the zeolite well conformed to the Freundlich isotherm equation, showing not just monolayer adsorption, 1/n 1, it is indicated that chromium( Ⅵ) of adsorption of modified zeolite is hard to react, but modified zeolite intensity was 8 times stronger than natural zeolite of that; it is satisfactory to match with pseudo-second order kinetic model, theoretical value Q=0.2367 mg/g, close to practical value 0.2319 mg/g; Elovich equation stimulates the process of dynamic, showing stronger ion exchange in process,the Intraparticle diffusion did have effect on the adsorption.