Research on the effect of magnesium oxide modified fly ash based polymer as methylene blue adsorbent
Experiments were conducted to prepare fly ash-based mass polymer microspheres(F-GP)using the suspension curing method.Fly ash was used as the raw material,while sodium hydroxide and water glass were used as exciters.Additionally,magnesium oxide-modified fly ash-based polymers(M-GP)were prepared through modification with magnesium oxide(MgO).The adsorption of methylene blue(MB)dye was investigated,and various factors such as adsorption time,initial concentration of MB so-lution,adsorbent dosage,and pH of the MB solution were examined to determine their effects on the adsorption of MB by geopoly-mer.The recoverability of M-GP and its dye immobilization efficiency were also considered.The results revealed that M-GP exhib-ited larger pore size,higher specific surface area,and better adsorption performance compared to F-GP.Under optimal conditions(m=0.30 g,pH=7,C0=2.5 mg/L,V=50 mL,and t=12 h),the adsorption efficiency of M-GP for MB reached 93％.The adsorption pro-cess followed the Langmuir adsorption model and quasi second-order kinetic model.
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