3D Hierarchical Flower Like Alumina Nanomaterials: Preparation and Arsenic Removal Performance

A 3D flower-like active alumina material was synthesized through a simple hydrothermal method following by calcination at 500 . This structure retains abundant nanoscale active sites and micro-scale 3D size. In the column adsorption test, when the arsenic-contaminated water flows through the material, this 3D hierarchical structure not only serves as a skeleton support, but also provides adsorption site with larger specific surface area so that the arsenate ion can be fully adsorbed. The synthesized alumina in this study performs better arsenic removal than the commercial one without secondary pollution in the water body. The arsenic removal kinetic tests clarify the application conditions of the pseudo first-and second-order adsorption kinetic models. Zeta potential and ionic strength reveal that the mechanism of adsorption of As (V) on -Al 2 O 3 follows the inner spherical model, while the adsorption of As (III) follows the outer spherical model.