The effect of calcium modified shrimp shell biochar on uranium removal after high concentration phosphorus treatment was discussed.Phosphorus-calcium modified shrimp shell biochar(P-Ca-SBC)was prepared by treating high concentration phosphorus solution with calcium modified shrimp shell biochar(Ca-SBC).The results showed that P-Ca-SBC had the highest removal capacity of U(Ⅵ)at pH=3,and its equilibrium adsorption capacity reached 969.768 mg/g,which was three times that of Ca-SBC.BET results showed that compared with Ca-SBC,the specific surface area of P-Ca-SBC increased by more than 16 times and the pore volume increased by more than 14 times.XRD and FTIR results showed that Ca-SBC formed HAP in 300 mg/L high concentration phosphorus solution.HAP on the surface of P-Ca-SBC plays an important role in the adsorption of U(Ⅵ).After contacting with U(Ⅵ),the functional groups on the surface of P-Ca-SBC complex with U(Ⅵ),and phosphoric acid reacts with U(Ⅵ)to form precipitated Ca(UO2)2(PO4)2·6H2 O.In conclusion,the calcium-modified waste shrimp shell biochar recovered in high phosphorus concentration solution can be used as an effective method to remove U(Ⅵ).
calcium modified biocharU(Ⅵ)high concentration of phosphorus
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