水污染治理技术
姚铭,杜莉珍,王凯雄,柯强.合成水滑石治理水体阴离子染料污染研究[J].环境科学学报,2005,25(8):1034-1040
合成水滑石治理水体阴离子染料污染研究
- Application of synthetic hydrotalcite in remediation of aqueous anionic dye pollution
- 基金项目：国家自然科学基金(No.20247001)
- 作者
- 单位
- 姚铭
- 浙江大学环境工程系, 杭州 310029
- 杜莉珍
- 浙江大学环境工程系, 杭州 310029
- 王凯雄
- 浙江大学环境工程系, 杭州 310029
- 柯强
- 温州师范学院生命与环境科学学院, 温州 325027
- 摘要：利用不同层电荷的合成水滑石(层状双氢氧化物)和它们的焙烧态为吸附剂,系统考察了此类材料对于甲基橙染料的吸附保留行为.通过粉末X射线衍射,傅立叶红外和扫描电镜测试说明经水热处理得到的合成水滑石具有良好的结晶度和相纯度.水滑石及其焙烧态对于甲基橙阴离子染料的吸附研究主要采用间歇平衡法实验.吸附体系的电导率变化显示了水滑石的记忆效应,并有可能是焙烧态水滑石再生的动态过程反应.低浓度甲基橙在焙烧态水滑石上的吸附实验说明,水滑石层电荷密度对于其焙烧态氧化物吸附低浓度阴离子具有显著的影响.
- Abstract：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.
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