Removal of Cr(Ⅵ)from simulated underground water by modified hydroxyapatite loaded with zero-valent iron
In order to effectively remove Cr(Ⅵ)from simulated underground water,using chemical reduc-tion method to load zero-valent iron on the hydroxyapatite modified by humic acid,so as to prepare composite material.The effect of modified hydroxyapatite loaded with zero-valent iron on Cr(Ⅵ)removal from simulated underground water was studied.The influence of composite material dosage,initial pH value,initial concentration of Cr(Ⅵ)and coexisting anion on degradation effect was discussed.The results showed that,the modified hy-droxyapatite loaded with zero-valent iron had good removal effect on Cr(Ⅵ)under the same condition.The low-er the initial pH value and the initial concentration of Cr(Ⅵ),the higher the removal rate and removal efficien-cy.When the initial mass concentration of Cr(Ⅵ)was 1 mg/L,the composite material dosage was 0.1 g/L,the mass concentration of Cr(Ⅵ)was lower than 0.004 mg/L after 120 min of reaction;besides,the inhibition effect of coexisting anion PO43-and CO32-on composite material was obvious.
underground water remediationhydroxyapatitesupportedzero-valent ironCr(Ⅵ)
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维普
