Abstract: Using fly ash as precursor and sodium metasilicate as activator, fly ash-based porous geopolymer rich in zeolite-like phase was prepared by chemical foaming principle. Using porous geopolymer as the basic framework, the self-supporting porous adsorption materials were prepared by hydrothermal conversion and LaCl3 loading modification. The performances of the above adsorption materials were characterized by SEM, XRD, BET and EDS. Meanwhile, the effect of simultaneous nitrogen and phosphorus removal for the prepared adsorption materials were studied through static adsorption experiments. The research results show that the use of lanthanum chloride solution to impregnate the self-supporting porous adsorption material can successfully load La3+ on the porous adsorption material. When the pH value of the nitrogen and phospho-rus solution is 6, the initial concentration of ammonia nitrogen is 25 mg/L, the initial concentration of phosphate is 30 mg/L, and the solid-to-liquid ratio is 1∶15 (mass ratio of the adsorption meterial to the nitrogen and phosphorus water sample), the removal rate of ammonia nitrogen and phosphorus from LaCl3@Zeolite self-supporting porous adsorption material reaches 90% and 100%, respectively. And the static adsorption isotherm conformed to the Langmuir isotherm adsorption model, and the adsorption kinetic data conformed to the pseudo-second-order kinetic equation.
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2022, Vol. 36 
