Abstract
This study reports on a material (CSH@SiO2@MgO) that is formed by calcium silicate hydrate (CSH) and silicon dioxide (SiO2), and then coated with magnesium oxide (MgO) on the surface. CSH@SiO2@MgO can simultaneously remove ammonia nitrogen (NH4+) and phosphate (PO43–) in water. The raw material SiO2 is extracted from the red mud by acid leaching. A simple preparation method is employed to synthesize CSH@SiO2@MgO composite material by using CSH@SiO2 with core-layer structure doped with MgO. The removal process of NH4+ and PO43– is as follows: First, the struvite precipitation method was used to remove NH4+ and a part of PO43–, and then the CSH@SiO2 was used to remove the residual part of PO43– through chemical precipitation reaction. The CSH@SiO2@MgO automatically regulated pH in water, and the removal rate of NH4+ and PO43– could reach 83.88% and 93.87%. Also, the CSH@SiO2@MgO was recycled five times, and the removal rate of NH4+ and PO43– was maintained at about 73.51% and 80.86%. It was characterized by...
Published Version
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