Preparation and Properties of Pesticide/Cyclodextrin Complex Intercalated into ZnAl-Layered Double Hydroxide

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• 作者：Xiaoguang Zhang ; Jiexiang Liu ; Wanguo Hou ; Jun Tong ; Luying Ren ; Guoying Sun ; Ya Sun
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 17, 2016
• 年：2016
• 卷：55
• 期：6
• 页码：1550-1558
• 全文大小：523K
• ISSN：1520-5045

文摘

Inclusion complexes were formed by including the pesticide beta-cypermethrin (BC) in sulfonated hydroxyethyl-β-cyclodextrin (SHECD) and sulfobutyl ether β-cyclodextrin (SBECD), and these complexes were then intercalated into the galleries of layered double hydroxides (LDHs) to synthesize BC/SHECD–LDH and BC/SBECD–LDH hybrids. The hybrids were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry/differential thermal analysis (TGA/DTA), and scanning electron microscopy (SEM). The results showed that BC/SHECD–LDH and BC/SBECD–LDH had basal spacings of 1.64 and 2.12 nm, respectively, which were analyzed on the basis of the structural properties of cyclodextrin (CD). The combustion temperature of interlayer SHECD was increased by 140 °C through intercalation. Furthermore, the release behaviors of BC from BC/SHECD–LDH and BC/SBECD–LDH composites were investigated. The release of BC from the hybrids was faster at pH 6.8 than at pH 5.0, and the released amounts were higher at the former pH, in close correlation with the structural type of CD and the release media. The BC release kinetic processes were well-fitted with pseudo-second-order and parabolic diffusion models. BC/SHECD–LDH could potentially be applied for pesticide formulation.