Scalable Preparation of Sub-Millimeter Double-Shelled Al₂O₃ Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red.

ABSTRACT: Porous double-shelled ceramic hollow spheres (PDSs) have attracted extensive attention due to their high specific surface areas and multifunctional designs. When used in wastewater treatment, millimeter or sub-millimeter spheres can be quickly separated from water by commercial sieves. However, the simple, scalable, and low-cost preparation of sub-millimeter PDSs in the solid phase remains a challenge. Herein, porous PDSs were facilely fabricated via a spheronization process utilizing pseudoboehmite powders and wet gelatin spheres as templates, which broke through the difficulty of preparing PDSs by one-step solid-state synthesis. Treating pseudoboehmite powder with nitric acid can improve the compressive strength of the PDSs. By controlling the rolling time and gelatin concentration of ge

SUBMITTER: Yan J 

PROVIDER: S-EPMC9607672 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature