Strip-like wet bottom slag-based geopolymer as an adsorbent for removal of heavy metal ions

The strip-like wet bottom slag-based geopolymer mixed with PES-NMP solutions, which used sodium hydroxide and sodium silicate as alkali activators, wet bottom slag as base materials respectively, were prepared by phase transition method. The as-prepared WBS geopolymer powder and strip-like adsorbents were systematically characterized by XRF, BET, XRD, SEM and heavy metal adsorption respectively. The experimental results presented that wet bottom slag had the potential to use as the base materials of geopolymer, which can form the amorphous structure, higher surface area and a bigger pore volume. That makes the adsorption of heavy metal to come true. When the heavy metal amount as 20 mg/L of each Fe2+ and Cu2+ ions, 40 mg/L of Mn2+, the as-prepared WBSG-PES-NMP strips showed the highest absorption capacity of 56.8%, 63.2% and 88.4% respectively.