Preparation and Adsorption Properties of Steel Slag Based Porous Geopolymer

Abstract

Abstract: Porous geopolymer materials were prepared with steel slag as the main raw material, water glass as the activator and H₂O₂ as the foaming agent. The raw materials and final samples were characterized by XRD, FTIR, SEM and BET. The effects of calcium silicon ratio, activator and H₂O₂ admixture on the properties of the material were studied. The porous geopolymer was used as adsorbent to investigate the adsorption effect of Cu²⁺. It shows that when the calcium-silicon ratio is 1.0, water glass mixing is 20.4% (mass fraction) and foaming agent mixing is 4% (mass fraction), the material performs well, with 86.4% total porosity, 0.5 MPa compressive strength, 0.408 g/cm³ volume density, volume water absorption rate is 56.31%, and steel slag utilization rate is 65.85%, significantly improving the specific surface area and pore capacity. The adsorption results show that the material has a good adsorption effect on Cu²⁺, the removal rate reaches 91.44%, and the equilibrium adsorption amount reaches 15.239 mg/g. The adsorption process conforms to the pseudo-second order.

Key words: steel slag, geopolymer, porous adsorption material, microstructure, pore structure, adsorption property, calcium silicon ratio, activator

CLC Number:

X705

SANG Mingming, ZHAO Hengze, WU Peiyi, FENG Jingxia, ZHU Lingqi, LI Ye. Preparation and Adsorption Properties of Steel Slag Based Porous Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 562-571.

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