Preparation of Magnetic Adsorbent Using High Gravity Technology

During the past few years, utilizing high gravity technology to prepare nanoparticles become the important trend. China has developed this novel technology to prepare nano calcium carbonate in the industrial scale. Based on this novel technology, the conventional rotating packed bed would be applied to the mass-production of nanoparticles. However, a conventional rotating packed bed has larger surface area of packings where nanoparticles would attach to easily, thus affecting the nucleation environment. Therefore, the conventional rotating packed bed would not be the best equipment for producing nanoparticles in the industry. Owing to that flow pattern and mixing efficiency of a rotating packed bed with blade packings are different from traditional apparatus, as expected; this novel equipment could have characteristics of micromixing similar to those of the conventional rotating packed bed. Moreover, a rotating packed bed with blade packings could offer smaller surface area of packings and higher micomixng efficiency at larger flow rates. Accordingly, a rotating packed bed with blade packings would be suitable for the mass-production of nanoparticles. At first, this study will investigate performance of a rotating packed bed with blade packings for preparing Fe3O4 magnetic adsorbents (nano Fe3O4, Fe3O4/HA, Fe3O4/SiO2) Finally, we hope that a rotating packed bed with blade packings could be adopted for the mass-production of these adsorbents in the industry. In the first part of this study, Fe3O4 magnetic nano-adsorbents will be prepared by co-precipitation method in a rotating packed bed with blade packings. Their properties and adsorption capacities will be investigated as a function of the main operating parameters, including molar ratio of Fe2+ to Fe3+, concentrations of Fe2+ and Fe3+, concentration of NaOH, rotating speed, flow rates, temperature, and ageing time. In the second part of this study, Fe3O4/HA magnetic adsorbents will be prepared by co-precipitation method combing humid acid (HA) in a rotating packed bed with blade packings. Their properties and adsorption capacities will be investigated as a function of the main operating parameters, including molar ratio of Fe2+ to Fe3+, concentrations of Fe2+ and Fe3+, concentration of NaOH, concentration of HA, rotating speed, flow rates, and ageing time. In the third part of this study, Fe3O4/SiO2 magnetic composite adsorbents will be prepared by Stober process in a rotating packed bed with blade packings. Their properties and adsorption capacities will be investigated as a function of the main operating parameters, including concentration of tetraethoxysilane (TEOS), concentration of cetyltrimethylammonium bromide (CTAB), rotating speed, flow rates, calcination temperature, and calcination time.

Project ID:PB10501-2952
External Project ID:MOST104-2628-E182-001-MY3