Preparation of modified ferromagnetic materials and their adsorption of Cd(Ⅱ)in water
The material(Fe≡Cd)after Cd(Ⅱ)adsorptionwas treated by ammonia leaching,the adsorbed Cd(Ⅱ)was desorbed and the material was modified at the same time,and a new modified ferro-based magnetic material(MFe)was obtained.Based on UV spectrum,solution chemistry and quantum chemistry analysis,it is confirmed that Cd(Ⅱ)on Fe≡Cd combines with free NH3 to form Cd-NH3 complexes to achieve desorption.The results show that(NH4)2SO4 and NH3·H2O leaching can desorb Cd(Ⅱ)on the surface of Fe≡Cd effectively.The structure and properties of MFe have been significantly changed,and a large number of iron(hydroxyl)oxides with strong adsorption activity have been generated,and the—NH2 group has been successfully modified on the surface of the material,providing more adsorption sites for Cd(Ⅱ).The adsorption capacity of MFe for Cd(Ⅱ)is significantly higher than that of Fe0(Qe=23.5 mg/g),reaching up to 47.0 mg/g.The recycling performance is favorable,and it can be efficiently recycled for more than 6 times.
NETL
NSTL
万方数据
