Preparation of spherical rice husk zeolite NaY granules for adsorption of Cu~(2+)

摘要

Spherical rice husk zeolite NaY granules (RH-NaY_g) were prepared by cross-linking of alginate biopolymer and using bentonite as a binder to obtain a uniform shape. The composition of granulation mixture was rice husk zeolite NaY, bentonite clay and alginate in the ratio of 50:30:20, respectively. The RH-NaYg were calcined at 600 °C to remove alginate and enhance the hardness of granules. Moreover, the RH-NaY_g were determined surface area by N_2 adsorption-desorption before utilization as the adsorbent for adsorption of Cu~(2+) at pH 5 for 90 min. The residual concentration of Cu~(2+) was reacted with NH_4OH solution to form the blue complex and measured at the wavelength of 606 nm by UV-vis Spectrophotometer. The average adsorption capacity of RH-NaY_g in 5000 ppm Cu~(2+) solution at pH 5 for 90 min was 242.27±0.12 mg/g.