Green chemistry is the preferred approach for the synthesis of metal and metal oxide nanoparticles due to its environmental friendliness, feasibility, and safety to human health when compared with other chemical or physical methods. Caesalpinia spinosa is a promising resource to be applied in the green synthesis of metallic nanoparticles due to the high amount of polyphenols. The aim of the present research was to obtain an antifungal coating functionalised with nanoparticles synthesised from C. spinosa tannin and aqueous solutions of metallic (silver and copper) salts to control biodeterioration of acrylic paints and bricks. Green synthesised NPs were characterised by UV-vis spectroscopy, transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS). The silver nanoparticles with average size of 12 nm and obtained from a 500 ppm aqueous solution of C. spinosa tannin inhibited the growth of Aspergillus niger, Penicillium commune and Lasiodiplodia theobromae. These strains were previously isolated from a biodeteriorated facade. Functionalised coating obtained with silver nanoparticles synthesised from C. spinosa tannin is reported for the first time as antifungal protective system of acrylic paints and bricks.

与其他化学或物理方法相比，绿色化学具有环境友好性，可行性和对人体健康的安全性，因此是合成金属和金属氧化物纳米粒子的首选方法。由于高含量的多酚，刺槐（Caesalpinia spinosa）是一种有希望的资源，可用于绿色合成金属纳米颗粒。本研究的目的是获得一种由C. spinosa合成的纳米粒子功能化的抗真菌涂层单宁和金属（银和铜）盐的水溶液可控制丙烯酸涂料和砖的生物降解。通过紫外可见光谱，透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）对绿色合成的NP进行了表征。具有12纳米的平均尺寸，并从500ppm的水溶液中获得的银纳米粒子C.刺鞣酸抑制的生长黑曲霉，青霉和Lasiodiplodia theobromae。这些菌株以前是从生物恶化的外观中分离出来的。用从棘孢梭菌合成的银纳米颗粒获得的功能化涂层 单宁首次被报道为丙烯酸涂料和砖的抗真菌保护体系。