Abstract: Two kinds of fly ash-slag geopolymer composites (LDHs@geopolymer) rich in layered double hydroxides (LDHs) were synthesized in-situ using high-alumina fly ash and granulated blast furnace slag as precursors,sodium hydroxide-sodium carbonate and calcium hydroxide-cal-cium sulfate dihydrate as mixed activators.The main mineral composition of LDHs@geopolymer was analyzed by XRD and SEM-EDS.The phosphorus removal effect of LDHs@geopolymer composites was investigated by static adsorption test.The results show that CO32--LDHs@geopolymer composites are synthesized in-situ with sodium hydroxide-sodium carbonate as activator and active magnesium oxide as regulating material.SO42--LDHs@geopolymer composites are synthesized in situ using calcium hydroxide-calcium sulfate dihydrate as activator.Under the adsorption conditions of initial H2PO4- concentration of 100 mg·L-1 and solid-liquid ratio of 1∶100,the adsorption capacity and removal rate of H2PO4- of CO32--LDHs@geopolymer composites prepared by doping 8wt% active MgO after heat treatment are 9.51 mg·g-1 and 95.1%,respectively.The adsorption capacity and removal rate of H2PO4- of SO42--LDHs@geopolymer composites prepared with mass ratio of 1∶1 calcium hydroxide-calcium sulfate dihydrate as activator are 9.99 mg·g-1 and 99.9%,respectively.Under the same conditions,SO42--LDHs@geopolymer composites have better phosphorus removal effect than CO32--LDHs@geopolymer composites.
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2024, Vol. 38 
