To evaluate the phosphate removal ability of oyster shell powder,oyster shell was used as raw material and doped with a certain amount of boron oxide for high-temperature calcination to obtain boron modified oyster shell powder.Its adsorption and removal behavior of phosphate in aqueous solution was investigated.The results showed that when the boron modification ratio was 3％,the dosage was 4 g/L,and the solution pH was 12,the adsorption removal rate of 20 mg/L phosphate solution reached 95％at 45 ℃ for 4 hours.FTIR chart showed that the main functional groups of the adsorbent were-OH,C=C,Ca-O,C-O-C,and C-H.The XRD pattern indicated that the main crystal form of the adsorbent material is CaCO3.The isothermal model fitting results indicated that the ad-sorption process of phosphate by modified oyster shell powder with a boron modification ratio of 3％was a single-layer adsorption,which was an energy uniform adsorption mechanism.The kinetic model showed that the adsorption process mainly belonged to the chemical adsorption process,which suggests that the main step controlling the ad-sorption reaction rate is the binding of the substances contained in the adsorbent with phosphate ions.This study can provide a theoretical basis for the resource utilization of oyster shells.
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