Application of synthetic hydrotalcite in remediation of aqueous anionic dye pollution
合成水滑石治理水体阴离子染料污染研究

Adsorption of aqueous methyl orange on synthetic hydrotalcites (layered double hydroxides) with different layer charges and their calcined forms was investigated. The materials used in this work were characterized by high power XRD, FT-IR and SEM, indicating the unique structure and high phase purity of the synthetic samples. The behaviors of these inorganic materials in the remediation of low level anionic pollution in water were studied. During the adsorption process, the electric conductivity change in the aqueous system was observed. The results showed that this conductivity change might be the reflection of the dynamic regeneration of the calcined hydrotalcite. It was also found that the ratio of Mg/Al of the calcined hydrotalcite played a vital role in the adsorption of low concentration of anionic dye in water.