Facile synthesis of amine-functionalized UiO-66 by microwave method and application for methylene blue adsorption

The metal-organic frameworks UiO-66 with amine functional groups were synthesized by microwave irradiation, their structures and properties were characterized. The results show that NH2-UiO-66 can be prepared quickly and well-crystallized by microwave-assisted method within 15 min. The amine-functionalized UiO-66 was octahedral crystals of well defined sizes (500-900 nm) and had a high specific surface area about 924.37 m(2) g(-1) and micropore range from 2.0 to 11 nm. The amine-functionalized UiO-66 was thermally stable up to 540 A degrees C stability and exhibited a good combination of methylene blue adsorption. The maximum adsorption capacity reached up to 203.95 mg g(-1). The kinetics and equilibrium of the adsorption process were found to follow the pseudo-second-order kinetic and Langmuir adsorption model, respectively.