A novel method for the preparation of Co Schiff-base functionalized MgAl layered double hydroxides
A novel method for the preparation of Co Schiff-base functionalized MgAl layered double hydroxides
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Co席夫碱功能化MgAl层状双氢氧化物的制备新方法
DOI：
10.1016/j.matchemphys.2015.10.035
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发表时间：
2015-11
影响因子：
4.6
通讯作者：
Li Ruifeng
中科院分区：
文献类型：
--
作者：
Lu Ningyue;Li Bingjie;Fan Binbin;Guo Wenya;Li Ruifeng
为了在水滑石（LDHs）上负载中性或阳离子金属配合物，提高金属配合物的负载量，提出了一种制备金属配合物功能化LDHs的新方法。该策略涉及在超声处理下在甲酰胺中剥离甘氨酸插层的MgAl LDH，然后在MgAl LDH纳米片上接枝甲硅烷基化的金属络合物，如通过在MgAl LDH上固定Co席夫碱所例示的。采用XRD、AFM、FT-IR、TG、N2吸附-脱附和ICP等技术对所制备的杂化材料进行了表征，并考察了其在H2 O2分解和苯乙烯氧环氧化反应中的催化性能。结果表明，与直接将硅烷化Co Schiff碱接枝到甘氨酸插层的MgAl LDH上制备的样品相比，通过这种方法制备的杂化材料具有更高的Co Schiff碱负载量，这是由于剥离的MgAl LDH纳米片上的接枝位点更容易到达。此外，发现接枝的复合物可以有效地阻止LDH纳米片在去除溶剂后的重新堆叠。因此，所制备的杂化物具有更高的比表面积和更易接近的活性中心，这使得所制备的杂化物在H2 O2分解和苯乙烯的O2环氧化反应中表现出较高的催化活性。本工作为制备具有多种金属配合物功能的LDH杂化物提供了一种新的途径。
In order to immobilize neutral or positive metal complexes on layered double hydroxides (LDHs) and increase the amount of immobilized metal complexes, a novel strategy for the preparation of metal complex functionalized LDHs is proposed. This strategy involves exfoliating glycine-intercalated MgAl LDH in formamide under an ultrasound treatment, and then grafting silylated metal complexes on MgAl LDH nanosheets, as exemplified by immobilization of Co Schiff-base on MgAl LDHs. The prepared hybrids were characterized by XRD, AFM, FT-IR, TG, N2adsorption–desorption and ICP techniques and their catalytic performances were investigated in H2O2decomposition and styrene epoxidation with O2. The results showed that the hybrid prepared by this strategy had higher Co Schiff-base loading than the sample prepared by directly grafting silylated Co Schiff-base on glycine-intercalated MgAl LDHs due to the more accessible grafting sites on the exfoliated MgAl LDH nanosheets. Additionally, it was found that the grafted complexes could effectively impede the restack of LDH nanosheets after removal of the solvent. Thus, the prepared hybrid exhibited higher surface area and more accessible active centers, which made the prepared hybrid exhibit high catalytic activity in H2O2decomposition and styrene epoxidation with O2. This work gives us a new way to prepare LDH hybrids functionalized with various metal complexes.
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影响因子：
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