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Precipitation Preparation of High Surface Area and Porous Nanosized ZnO by Continuous Gas-Based Impinging Streams in Unconfined Space

Zhou, Caijin, Wang, Yujun, Du, Le, Yao, Hongbao, Wang, Jingchuo, Luo, Guangsheng
Industrial & Engineering Chemistry Research 2016 v.55 no.46 pp. 11943-11949
atomization, chemistry, engineering, mixing, nanoparticles, streams, surface area, zinc oxide, zinc sulfate
Using the precipitation method, we propose a new process for the preparation of high specific surface area and large pore volume ZnO nanoparticles in unconfined space with NH₄HCO₃ and ZnSO₄·7H₂O as the reactants. The mixing performance of the reaction system was improved by gas atomization and continuous gas-based impinging streams before the precipitation reaction. By virtue of the gas environment and gas division, the obtained nanoparticles have a very good dispersion performance. Under optimal conditions, the ZnO nanoparticles were synthesized with a surface area of 88.89 m²/g, an average diameter of 7 nm, and a pore volume of 0.68 cm³/g. The influences of ZnSO₄ concentration, pressure, and gas–liquid ratio on the properties of the synthesized nanoparticles were studied. This study aims to provide a feasible and economical way to produce better properties in nanosized ZnO particles, which are widely applied as a new, multifunctional material.