磁性镁铁阴离子黏土吸附去除水中锑酸盐的研究

Removal of antimonate from water by adsorption of magnetic Mg/Fe anionic clay

采用共沉淀-煅烧法制备磁性镁铁阴离子粘土(Mg/Fe-MLDO),考察其对水中Sb(Ⅴ)的吸附去除效能与机制。结果表明:在吸附剂投加量为1.0 g/L、Sb(Ⅴ)浓度为40 mg/L、pH为4、温度为45℃的条件下,Mg/Fe-MLDO对Sb(Ⅴ)的最大吸附容量为139.46 mg/g;通过XRD和FTIR表征发现,吸附过程会恢复Mg/Fe-MLDO原有的层状结构;Mg/Fe-MLDO对Sb(Ⅴ)的吸附过程包括物理吸附和化学吸附,且为单分子层吸附;相较于Cl^(-)、NO_(3)^(-)和SO_(4)^(2-),CO_(3)^(2-)和PO_(4)^(3-)对Sb(Ⅴ)吸附过程存在较强的抑制作用。

Magnetic magnesium-ferric anionic clay(Mg/Fe-MLDO)was prepared by co-precipitation and calcination method,and the adsorption efficiency and mechanism of Sb(Ⅴ)in water were investigated.The results showed that the maximum adsorption capacity of Mg/Fe-MLDO for Sb(Ⅴ)was 139.46 mg/g under the conditions of 1.0 g/L adsorbent dosage,40 mg/L Sb(Ⅴ)concentration,pH 4 and temperature 45℃.XRD and FTIR characterization indicated that the original lamellar structure of Mg/Fe-MLDO was restored during the adsorption process.The adsorption process of Mg/Fe-MLDO on Sb(Ⅴ)included physical adsorption and chemical adsorption,and also was monolayer adsorption.Compared with Cl^(-),NO_(3)^(-)and SO_(4)^(2-),CO_(3)^(2-)and PO_(4)^(3-)have stronger inhibition on the adsorption process of Sb(Ⅴ).