Preparation of mesoporous silica modified by zinc (Ⅱ) Schiff base complex and its adsorption and sustained release properties for chlorpyrifos

doi:10.11949/j.issn.0438-1157.20171217

Abstract

Abstract:

Zinc Schiff base modified MCM-41 (Zn-MCM-41) was prepared by co-condensation method, uses 3-aminopropyl triethoxysilane (APTES), salicylaldehyde and zinc ions as modifying agent. The chlorpyrifos/Zn-MCM-41 (CH-Zn-MCM-41) system was prepared by impregnation method, employing chlorpyrifos as a model drug. The structures and distribution form of chlorpyrifos of MCM-41, amino functionalized MCM-41 (NH₂-MCM-41), salicylaldehyde Schiff base functionalized MCM-41 (SA-MCM-41) and Zn-MCM-41 were systematically characterized by X-ray diffraction assay(XRD), N₂ adsorption-desorption, Fourier transform infrared spectroscopy(FTIR), differential scanning calorimeter(DSC) and X-ray photoelectron spectroscopy(XPS). The adsorption capacity of MCM-41 for chlorpyrifos before and after modification was discussed. The adsorption kinetics, adsorption thermodynamics and sustained release performance of as-synthesized system were also investigated. The results showed that the order structure of NH₂-MCM-41 and SA-MCM-41 was still maintained by co-condensation method. After modification of MCM-41, the adsorption capacity of chlorpyrifos increased from 54 mg·g^-1 to 186 mg·g^-1, an increase of 244% due to the coordination effect between Zn-MCM-41 and chlorpyrifos. The adsorption kinetics and adsorption thermodynamics of MCM-41 on chlorpyrifos before and after modification were in accordance with pseudo-first-order kinetic model and Freundlich model, respectively. The releasing behavior of CH-Zn-MCM-41 could be described by Riger-Peppas equation which indicates that the chlorpyrifos release was controlled by Fick diffusion.

Key words: MCM-41, zinc (Ⅱ) Schiff base, chlorpyrifos, adsorption, sustained release

摘要：

以3-氨丙基三乙氧基硅烷（APTES）、水杨醛和锌离子为改性剂，通过共缩聚法合成席夫碱锌配合物改性MCM-41（Zn-MCM-41），并以毒死蜱为模型药物，制备了毒死蜱/席夫碱锌配合物改性MCM-41缓释体系。利用XRD、N₂吸附-脱附、FTIR、DSC和XPS对MCM-41、氨基改性MCM-41（NH₂-MCM-41）、水杨醛席夫碱改性MCM-41（SA-MCM-41）的结构、毒死蜱的分布形态和Zn-MCM-41的配位情况进行了表征，考察了MCM-41在改性前后对毒死蜱的吸附量，并着重探究了其对毒死蜱的吸附动力学、吸附热力学以及缓释性能。结果表明，APTES和水杨醛席夫碱改性后的MCM-41仍具有较为有序的介孔结构。MCM-41对毒死蜱的吸附量为54 mg·g^-1，Zn-MCM-41的吸附量为186 mg·g^-1，相对于MCM-41，其吸附量增加了244%。改性前后的MCM-41对毒死蜱的吸附动力学和吸附热力学分别符合准一级动力学模型和Freundlich模型。毒死蜱/席夫碱锌配合物改性MCM-41缓释体系的释药行为可用Riger-Peppas动力学模型来描述，其药物释放由Fick扩散控制。

关键词: MCM-41, 席夫碱锌, 毒死蜱, 吸附, 缓释

CLC Number:

TQ450.6

ZHOU Hongjun, LIN Yueshun, LI Shujing, XU Hua, CHEN Huayao, ZHOU Xinhua. Preparation of mesoporous silica modified by zinc (Ⅱ) Schiff base complex and its adsorption and sustained release properties for chlorpyrifos[J]. CIESC Journal, 2018, 69(5): 2272-2281.

周红军, 林粤顺, 李舒静, 徐华, 陈铧耀, 周新华. 席夫碱锌改性介孔硅对毒死蜱的吸附与缓释[J]. 化工学报, 2018, 69(5): 2272-2281.

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