Hybrid organic-inorganic derivatives of layered double hydroxides and dodecylbenzenesulfonate: Preparation and adsorption characteristics
Hybrid organic-inorganic derivatives of layered double hydroxides and dodecylbenzenesulfonate: Preparation and adsorption characteristics
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DOI：
10.1039/b106811c
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发表时间：
2002-03
影响因子：
--
通讯作者：
Youwen You;Hongting Zhao;G. Vance
中科院分区：
文献类型：
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作者：
Youwen You;Hongting Zhao;G. Vance
层状双氢氧化物（LDH）是可以在实验室条件下合成的阴离子粘土。在本研究中，通过共沉淀法合成了不同的LDH，并评估了母体产品和煅烧衍生物吸附阴离子表面活性剂十二烷基苯磺酸盐（DBS）的能力。 DBS在LDH上的保留吸附等温线是典型的L型曲线，吸附数据符合简单的Langmuir方程。 DBS 在煅烧的 LDH 上的 Langmuir 最大吸附量显着高于未煅烧的 LDH。有机-LDHs还通过离子交换、煅烧-LDH重构和原位合成方法将DBS掺入LDHs中来合成。有机LDH的X射线衍射分析表明，DBS嵌入LDH中，单层DBS分子垂直于LDH表面取向。根据 BET 分析，DBS 插入 LDH 会降低表面积。有机LDHs对三氯乙烯(TCE)和四氯乙烯(PCE)的吸附能力明显大于原始LDH材料。有机LDHs对有机化合物的吸附是由于分配机制。
Layered double hydroxides (LDHs) are anionic clays that can be synthesized under laboratory conditions. In this study, different LDHs were synthesized by a coprecipitation method, with the parent products and calcined derivatives evaluated for their ability to adsorb the anionic surfactant, dodecylbenzenesulfonate (DBS). Adsorption isotherms for DBS retention on LDHs were typical L-type curves, with adsorption data conforming to a simple Langmuir equation. Langmuir maximum adsorption of DBS on calcined-LDH was significantly higher than that on uncalcined-LDHs. Organo-LDHs were also synthesized by incorporating DBS into LDHs via ion-exchange, reconstruction of calcined-LDH and in-situ synthesis methods. X-ray diffraction analysis of organo-LDHs revealed that DBS was intercalated into LDHs with the mono-layer DBS molecules oriented perpendicularly to LDH surfaces. Intercalation of DBS into LDHs decreased surface area according to BET analysis. The adsorption capacities of organo-LDHs for trichloroethylene (TCE) and tetrachloroethylene (PCE) were substantially greater than the original LDH materials. Adsorption of organic compounds by organo-LDHs was due to a partitioning mechanism.