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Design and preparation of carbendazim-loaded alumina nanoparticles as a controlled-release biocide for wood protection

Mattos, Bruno D., Magalhães, Washington L.E.
International biodeterioration & biodegradation 2017 v.123 pp. 174-181
adsorption, aluminum oxide, biocides, carbendazim, decay resistance, fungi, infrared spectroscopy, kinetics, milling, nanoparticles, surfactants, thermogravimetry, wood
Biocide delivery systems are intelligent strategies towards improving the efficiency of biocides over time. Here, we have developed a biocide system by loading alumina nanoparticles with carbendazim through surfactant-assisted ball milling. The obtained biocides were further validated by their impregnation into pinewood, followed by in vitro fungi tests. Fourier-transformed infrared spectroscopy stated physical adsorption of carbendazim on alumina, while the thermogravimetric analysis revealed its adsorption in a pseudo-molecular level. The carbendazim loading efficiency was improved after surfactant addition, which was also fundamental to effectively impregnate the pinewood. The biocide release profiles could be described using the parabolic-diffusion and Korsmeyer-Peppas kinetic models, which fitted the experimental data with determination coefficients over 0.9. After 600 h, the biocide systems have released 42–76% of carbendazim, where systems with higher biocide content released faster. The pinewood solid samples were completely impregnated with the prepared biocides; however, it tended to concentrate on the wood surface. A biocide retention of only 0.4 kg m⁻³ of sufficient to increase in 10 times the decay resistance of the pinewood, indicating very promising results.