中文摘要：

利用层状双金属氢氧化物（LDHs）层间阴离子的可交换性及其结构记忆效应，研究了氯离子插层镁铝双金属氢氧化物（MgAl-Cl-LDHs）及镁铝双金属氧化物（MgAl-LDO）去除^S2-的性能及机理。采用X射线粉末衍射（）（RD）、红外光谱（FTIR）、紫外．可见光谱（UV-Vis）和电感耦合等离子体原子发射光谱（ICP）等表征技术，详细探讨了焙烧复原法及离子交换法得到的不同产物的结构和去除S2。性能，提出了MgAl-Cl-LDHs和M异Al-LDO对S^2-的不同去除机理。结果表明，MgAl-LDO具有较MgAl-Cl-LDHs更为优良的去除S^2-性能。文中所有去除实验的pH值均为9，此时S^2-。发生水解且主要以HS^-存在于溶液中。采用MgAl-Cl-LDHs为前体时，HS^-的离子交换能力比Cl^-弱，不能通过与Cl^-交换进入层间，S^2-的去除机理主要是表面吸附HS^-及将其氧化成S2O3^2-。以MgAl-LDO为前体时，HS^-通过LDO结构恢复能迅速进入层间，且受MgAl-LDO的催化氧化性能的影响，在结构恢复的同时HS-被氧化成S2O3^2-、S^2-和S^3-，可以高效去除溶液中的S^2-。nMg/nAl比为2的LDHs在500℃下焙烧的产物MgAl-LDO对S^2-的去除率能够达到98％以上，以MgAl-LDO去除S^2-的方法可作为一种高效除S^2-的方法。

英文摘要：

Based on the exchangeable property of the interlayer anions and the so-called ＂memory effect＂ of the layered double hydroxides （LDHs）, the capacities and mechanisms for sulfide anion （S^2-） removal were studied using chloride-containing MgAl-LDHs （MgAl-Cl-LDHs） and the layered double oxides （MgAl-LDO）. Structures of the products obtained by anion exchange and reconstruction, and the removal capacities were characterized by XRD, FTIR, UV-Vis and ICP, and the different mechanisms for MgAl-Cl-LDHs and MgAl-LDO were proposed. The results indicate that the removal capacity for MgAl-LDO is much greater than that for MgAl-Cl-LDHs. In this work S^2- removal test was proceed at pH of 9, and then S^2- was hydrolyzed, and mainly existed as HS^- in the solution. When MgAl-Cl-LDHs was used as the precursor to remove S^2-, due to the weaker exchange capacity for HS^- compared to Cl^-, HS^- could not enter the interlayer through anion exchange with Cl^-. Adsorption of HS^- to the sample＇s surface and oxidation to S2O3^2- are the removal mechanism for MgAl-Cl-LDHs. While when MgAl-LDO was used as the precursor, during the structure recovering, HS^- entered the interlayer qickly, and was oxidized to thiosulfate anion （S2O3^2-） and polysulfide anions （S2^- and S3^-） simultaneously. Therefore, MgAl-LDO can remove S^2- efficiently. The products of LDHs with Mg/Al molar ratio of 2 calcined at 500℃ were shown to have a high degree of removal capacity at above 98%.