Citation: LIN Yue-Shun, ZHOU Hong-Jun, ZHOU Xin-Hua, GONG Sheng, XU Hua, CHEN Hua-Yao. Preparation and Properties of pH Value-Responsive Sustained Release System of Chlorpyrifos/Copper (Ⅱ)) Schiff Base SBA-15[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(3): 446-454. doi: 10.11862/CJIC.2017.056 shu

Preparation and Properties of pH Value-Responsive Sustained Release System of Chlorpyrifos/Copper (Ⅱ)) Schiff Base SBA-15

Guangzhou Key Laboratory of Efficient Utilization of Agrochemicals, College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China

Corresponding author: ZHOU Xin-Hua, cexinhuazhou@163.com
Received Date: 10 November 2016
Revised Date: 25 December 2016

Figures(10)

Copper Schiff base modified SBA-15(Cu-SBA-15) was prepared by post-grafting, using 3-aminopropyl triethoxysilane (APTES), salicylaldehyde and copper ions as modifying agent. The chlorpyrifos/Cu-SBA-15 (CH-Cu-SBA-15) system were prepared by impregnation method, employing chlorpyrifos as a model drug. The morphologies and structures of SBA-15, amino functionalized SBA-15(NH₂-SBA-15), salicylaldehyde functionalized SBA-15(SA-SBA-15), and Cu-SBA-15 were systematically characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction assay (XRD), N₂ adsorption-desorption, TGA analysis, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Meanwhile, the adsorption capacity (AC) of as-synthesized system for chlorpyrifos and sustained release performance of SBA-15 before and after modification were investigated. Besides, the sustained release behavior of CH-Cu-SBA-15 under different pH values were also discussed. The results showed that SBA-15 could be modified by APTES and salicylaldehyde, and the order structure of it was still maintained by post-grafting method. After modification of SBA-15, the AC of chlorpyrifos increased from 100 to 195 mg·g^-1 with a better sustained release performance. In addition, the CH-Cu-SBA-15 system showed significant sensitivity in response to the pH value. The chlorpyrifos release rate under pH=3 was greater than pH=11 and the sustained release performance of them was relatively better than under the neutral condition. Meanwhile, their releasing curves could be described by Riger-Peppas equation indicating that the drug release was controlled by Fick diffusion.
- SBA-15,
- copper (Ⅱ) Schiff base,
- pH value responsiveness,
- chlorpyrifos,
- sustained release
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