Preparation of Ca-based LDO composite material and its adsorption performance for phosphate
The release of untreated excess phosphate into the water system will lead to very serious environmental problems.In order to remove excessive phosphate in water,the raw materials of solid waste flue gas desulfurization gypsum and Mg-Al hydrotalcite were mixed according to the initial molar ratio,and then a high-efficiency phosphorus removal adsorbent was prepared by hydrothermal synthesis and roasting,and characterized by XRD,FT-IR,SEM,BET and TGA.Taking phos-phate as the target pollutant,the effects of adsorbent dosage,time,initial concentration,temperature,pH value of initial so-lution and coexisting ions on adsorption capacity and cyclic adsorption capacity of adsorbent were investigated.The results showed that Freundlich adsorption isotherm and pseudo-second-order kinetic equation could describe the adsorption pro-cess of phosphate well.Under the conditions of 25℃,pH=12 and adsorbent dosage of 10 mg,the adsorption capacity could reach 209.02 mg/g,and the adsorption behavior was relatively stable in the pH range of 4～11.The adsorption mechanism in-cluded internal diffusion,ligand exchange and precipitation reaction.This work not only provided a method for effectively utilizing solid waste to prepare adsorbent,but also provided theoretical significance for controlling eutrophication of water body and realizing waste recycling.
flue gas desulfurization gypsumhydrotalcitephosphateadsorptionresource utilizationlayered metal oxide
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