A new type of composite Ni/Co-MOF was prepared by solvo-thermal method,and the surface mor-phology and structure of Ni/Co-MOF were characterized.Then,the absorption property of Ni/Co-MOF for acid dyes was studied.The results show that Ni/Co-MOF has a unique petal-like hollow nano-cage structure,and the pore size is as high as 14.56 nm.The adsorption capacity of Ni/Co-MOF for acid orange 156 was as high as 355 mg/g.Studies on adsorption isotherms and kinetics shows that the adsorption of acid orange 156 on Ni/Co-MOF conform to the Langmuir isotherm model and the quasi-second-order kinetic model,which is an endothermic spontaneous process,and the adsorption method is mainly chemical adsorption.Ni/Co-MOF can still show excellent adsorption performance for adsorbed acid orange 156 after five adsorption-desorption experiments.
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