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. 2022 Aug 5:10:894386.
doi: 10.3389/fchem.2022.894386. eCollection 2022.

Structure and release properties of pyrethroid/sulfobutyl ether β-cyclodextrin intercalated into layered double hydroxide and layered hydroxide salt

Xiaoguang Zhang  1 , Jiexiang Liu  2 , Jihui Ren  2
Affiliations

Structure and release properties of pyrethroid/sulfobutyl ether β-cyclodextrin intercalated into layered double hydroxide and layered hydroxide salt

Xiaoguang Zhang et al. Front Chem. .

Abstract

The aim of this study was to realize the intercalation of the pyrethroid pesticides beta-cypermethrin (BCT) and lambda-cyhalothrin (LCT) into ZnAl-layered double hydroxides (LDH) and NiZn-layered hydroxide salt (LHS). BCT (LCT)/SBECD-LDH and BCT (LCT)/SBECD-LHS hybrids were obtained with the aid of sulfobutyl ether β-cyclodextrin (SBECD) through one step method. The hybrids were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetry and differential thermal analysis (TGA/DTA). The hybrids based on LHS had larger basal spacing than those on LDH. The LDH-hybrids prepared in N-methylpyrrolidone (NMP) had larger basal spacing than those in ethanol. These results were discussed in terms of the matrix structure and solvent properties. The supramolecular structure of the hybrid was reasonably proposed. Furthermore, the release properties of BCT (LCT) from the hybrids were investigated and discussed in two media. The release rate in pH = 5.0 was slower than that in pH = 6.8. The accumulated release amount of pesticide in pH = 5.0 was lower than that in pH = 6.8. LHS-hybrids synthesized in ethanol exhibit a sustainable release property. These depend on the inclusion complexes' arrangement and release medium. The release kinetic processes could be described by pseudo-second order and parabolic diffusion models. The release behavior can be controlled by adjusting the synthesis conditions and the releasing media. This provides the guidance for the application of SBECD and LDH (LHS) in pesticide formulation.

Keywords: LDH; LHS; SBECD; hybrids; pyrethroid; release behavior.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Preparation schematics of the hybrids (SBECD, n1+n2 = 6.5).
FIGURE 2
FIGURE 2
XRD patterns of BCT (LCT)/SBECD-LDH (A) and BCT (LCT)/SBECD-LHS samples (B) E and N in parentheses denote the solvent ethanol and NMP used in the synthesis of the sample, respectively.
FIGURE 3
FIGURE 3
FT-IR spectra of samples (a) LCT; (b) BCT; (c) BCT/SBECD-LDH (N); (d) BCT/SBECD-LDH (E); (e) LCT/SBECD-LDH (N); (f) LCT/SBECD-LDH (E); (g) BCT/SBECD-LHS (N); (h) BCT/SBECD-LHS (E); (i) LCT/SBECD-LHS (N); (j) LCT/SBECD-LHS (E).
FIGURE 4
FIGURE 4
TGA (A) and DTA (B) curves of BCT (LCT)/SBECD-LDH samples.
FIGURE 5
FIGURE 5
TGA (A) and DTA (B) curves of BCT (LCT)/SBECD-LHS samples.
FIGURE 6
FIGURE 6
Release curves of pesticides from LDH-hybrids in different media.
FIGURE 7
FIGURE 7
Release curves of pesticides from LHS-hybrids in different media.
FIGURE 8
FIGURE 8
Regression curves of release data fitting with pseudo second-order model for LDH-hybrids (A,B) and LHS-hybrids (C,D) in different mediums.
FIGURE 9
FIGURE 9
Regression curves of release data fitting with parabolic diffusion model for LDH-hybrids (A,B) and LHS-hybrids (C,D) in different mediums.
FIGURE 10
FIGURE 10
Regression curves of release data fitting with Bhaskar model for DHS-hybrids (E) and LHS-hybrids (N) in different mediums.
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