Efficient preparation of red mud-based geopolymer microspheres (RM@GMs) and adsorption of fluoride ions in wastewater.

In this paper, red mud-based geopolymer microspheres (RM@GMs: 75-150 µm) was prepared by dispersion-suspension-solidification method to remove fluoride ions (F). It was found that RM@GMs still had good mechanical properties and better F removal effect at RM content reached 80 % of the total solid mass. The batch adsorption experiment results showed that the F concentration (< 1.