Development of Cationic Cellulose-Modified Bentonite–Alginate Nanocomposite Gels for Sustained Release of Alachlor

Abstract

The nanocomposite gel prepared from nanoclay and natural polysaccharides showed a good sustained-release property. Herein, a cationic cellulose-modified bentonite–alginate nanocomposite gel was prepared and used to enhance the sustained release of alachlor. The underlying effect and mechanism of the structure of modified bentonite–alginate nanocomposite gels on the release behavior of alachlor were explored by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric (TG) analysis. The results showed that the release of alachlor from the nanocomposite gels was dominated by Fickian diffusion and closely related to the adsorption capacity and permeability of the matrix. The cationic cellulose intercalated into the interlayer space of bentonite through an ion exchange reaction, which significantly enhanced the hydrophobicity of bentonite and its interaction with alachlor. The stacking aggregation of bentonite nanoplatelets and permeability of the gel network were decreased through the electrostatic interaction between cationic cellulose and alginate molecular chains, thus remarkably enhancing the sustained-release property of the nanocomposite gel. The release kinetics revealed that the release rate of alachlor from the nanocomposite gel first decreased and then increased as the content of bentonite and modified bentonite gradually increased. Also, the best sustained-release property of the nanocomposite gel was obtained at bentonite and modified bentonite additions of about 10%, under which the release time of 50% alachlor ( T 50 ) from bentonite–alginate and modified bentonite–alginate nanocomposite gels was 4.4 and 5.6 times longer than the release time from pure alginate gels, respectively.

Xanthan-Based Materials as a Platform for Heparin Delivery

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Preparation of Emamectin Benzoate·Hexaflumuron Granules Based on Response Surface Methodology

“…The experimental values were basically consistent with the model optimization simulation values, which indicates that the optimization model had good reliability. Response surface method optimization determined the quality of each factor affecting the granule encapsulation efficiency, and the granule formulation optimized by the response surface method was significantly improved compared to the conventional artificial formulation. ,− Typical photographs of Eb·He-loaded composite beads are shown in Figure . The beads obtained were generally spherical in shape and the size varied in the range from 1.1 to 1.5 mm for the composites.…”