Bismuth oxychloride (BiOCl) nanoparticles were synthesized using bismuth nitrate pentahydrate (Bi (NO3)3*5H2O) and tannic acid (C76H52O46), the latter playing the role of stabilizing agent in a highly acid environment. For the characterization of the particles several techniques were used. The X-ray diffraction patterns (XRD) confirmed the formation of BiOCl nanocrystals with an average size of 15.33 ± 0.16 nm. Raman spectroscopy showed the characteristic A1g and Eg vibrational normal modes of BiOCl. Through electron microscopy studies (SEM and TEM) the formation of nanosized particles was confirmed. The average particle size measured from TEM images was 22.11 ± 0.29 nm, in good agreement with the one calculated from XRD data. The synthesis method was performed in aqueous solution and it represents an easy and low-cost protocol for the production of BiOCl nanoparticles.

中文翻译：

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氯氧化铋BiOCl纳米颗粒的化学合成与表征

使用五水合硝酸铋（Bi (NO3)3*5H2O）和单宁酸 (C76H52O46) 合成氯氧化铋 (BiOCl) 纳米颗粒，后者在强酸性环境中起到稳定剂的作用。为了表征颗粒，使用了几种技术。X 射线衍射图 (XRD) 证实了 BiOCl 纳米晶体的形成，平均尺寸为 15.33 ± 0.16 nm。拉曼光谱显示了 BiOCl 的特征 A1g 和 Eg 振动正常模式。通过电子显微镜研究（SEM 和 TEM）证实了纳米颗粒的形成。从 TEM 图像测量的平均粒度为 22.11 ± 0.29 nm，与从 XRD 数据计算的粒度一致。