Preparation Of Molybdenum Oxide Based Multi-stage Structural Materials And Their Adsorption Properties

In this paper, the hierarchical structure of flower-like α-MoO3,α-MoO3 nanosheet array and MoO3/TiO2 array assembled on capillary was successfully obtained via a facile template-free hydrothermal route. These materials were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. Then the adsorption properties of these materials were investigated using rhodamine B (RhB) and basic fuchsin (BF) as the target substances. The main contents were as follows:By using the molybdenum acetylacetonate as raw material, the hierarchical structure of flower-like a-MoO3 was prepared by solventhermal method directly with using glacial acetic acid and deionized water as the mixed solvent. The flower-like structure of MoO3 was about 2 μm in diameter and consists of numerous nanoslices which are 1 μm in length,400 nm in width, and 10-20 nm in thickness, The growth point is center of the nanoflower. In the rhodamine B (RhB) dye adsorption experiment, the adsorption properties indicated that the material was an excellent adsorbent for RhB, and the maximum adsorption capacity can reach to 208.3 mg g-1.A novel α-MoO3 nanosheet array assembled on capillary was successfully obtained via a facile template-free hydrothermal route using molybdenum acetylacetonate and acetic acid as the starting materials. The a-MoO3 nanosheets are porous with pore size in a range of 2 to 5 nm, showing a large specific surface area of 22.28 m2 g-1. Then the adsorption properties of a-MoO3 porous nanosheet arrays were investigated using rhodamine B (RhB) as the target substances, which exhibits a fast rate and high capacity to the RhB and the adsorption equilibrium can attain in a short time of 30 min, and the maximum removal capacity for RhB is 1025.9 mg g-1. Moreover, the growth process of the a-MoO3 nanosheet array and the possible mechanism of the adsorption to RhB also has been studied in this part.With molybdenum acetylacetonate and titanium acetylacetonate as raw materials, the uniform TiO2/MoO3 nanoplates array was synthesized by solventhermal method combined with 500 ℃ calcination. The array consists of a large number of nanometer plates which length is about 11 μm, width is adout 3 μm, and about 80-150 nm in thickness. Then the adsorption properties of TiO2/MoO3 nanoplates arrays were investigated using basic fuchsin (BF) as the target substances. The results indicated that the adsorption equilibrium time of BF is shortened to 60 min, and the maximum adsorption capacity is increased to 454.5 mg g-1.