Effect of Calcium Modified Shrimp Shell Biochar on the Removal of Uranium after Treatment of High Phosphorus Solution
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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