Abstract
Hierarchical AlPO-34 molecular sieves microspheres were synthesized in a [BMIm]Br ionic liquid without template or complex post-treatment process. The formation mechanism of such framework structures and their morphology were investigated. [BMIm]Br was proven to serve as both solvent and sole provider of the structure directing agent. The organic amine in the compound affects the framework density of the crystals and promotes the formation of a chabazite (CHA) type framework. After ageing for 1 h the AlPO-34 microspheres are formed due to the aggregation properties of the ionic liquid. The hierarchical mirosphere has a relatively high Brunauer–Emmett–Teller surface area and a considerably uniform mesoporous channel network. The hierarchical AlPO-34 microspheres were used as absorbers of heavy metal cations and showed a higher loading capacity and distribution coefficient compared with the AlPO-34-NH.
Highlights
Zeolitic materials are one of the oldest and the most accessible porous crystalline compounds which are widely used in many fields, such as catalysis, gas separation, adsorption and wastewater treatment [1]
During the ionothermal synthesis process, the organic amines usually adjust the physico-chemical properties of the solvents and play the role of structural or co-structural directing agents [26]
1-butyl-3-methylimidazolium bromide is used as both the solvent and the sole provider of the structure directing agent. These results show that the ionothermal synthesized products, which have a low framework density (FD) structure, can be obtained by increasing the amine concentration in the ionothermal system, leading to the reassembling of the inorganic hosts around the mutated organic guests
Summary
Zeolitic materials are one of the oldest and the most accessible porous crystalline compounds which are widely used in many fields, such as catalysis, gas separation, adsorption and wastewater treatment [1]. Their unique channels often provide a relatively efficient performance. A novel zeolitic molecular sieves synthesis method, known as ionothermal synthesis method, enables the fabrication of zeolites via atmospheric pressure synthesis, due to the negligible vapour pressure of the ionic liquid solvents [10,11,12] In this technique, ionic liquids with a low melting point (less than 100°C), high polarity, electric conductivity and thermal stability, and low vapour pressure are used as solvents during the fabrication of the porous materials [13,14]. Adsorption performance of AlPO-34 was studied to remove heavy metal ions such as Cr(III), Zn(II), Pb(II) and Cu(II) from water
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