Abstract Zinc borate was synthesized from the reaction of zinc oxide and boric acid in the absence or presence of seven different water soluble additives. Additive concentration and zinc oxide particle size were varied to investigate their effect on the growth kinetics of zinc borate particles. Zinc borate particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Samples taken from the reaction mixture during the synthesis were analyzed for determining the concentration of zinc oxide, boron oxide, and zinc borate. The results reveal the formation of zinc borate with the molecular formula 2ZnO·3B2O3·3H2O in the form of irregular platelets. The product retains its hydrate up to 300 °C. The reaction rate was found to increase when additives or nanosize zinc oxide were used. However, a lag time is observed in the presence of additives while the reaction completion time remains unaffected. The experimental kinetics data were fit to the logistic model. The variation of the model parameters with experimental conditions was also investigated. The results reveal that the specific reaction rate increases with the increasing concentration of additives and the decreasing size of zinc oxide particles.

中文翻译：

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使用水溶性添加剂合成硼酸锌：动力学和产品表征

摘要 硼酸锌是由氧化锌和硼酸在七种不同水溶性添加剂存在或不存在下反应合成的。改变添加剂浓度和氧化锌粒度以研究它们对硼酸锌颗粒生长动力学的影响。硼酸锌颗粒通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和热重分析 (TGA) 进行表征。分析在合成过程中从反应混合物中取出的样品以确定氧化锌、氧化硼和硼酸锌的浓度。结果表明硼酸锌以不规则片晶的形式形成，分子式为2ZnO·3B2O3·3H2O。该产品可在高达 300 °C 的温度下保持其水合物。当使用添加剂或纳米级氧化锌时，发现反应速率增加。然而，在存在添加剂的情况下观察到滞后时间，而反应完成时间不受影响。实验动力学数据符合逻辑模型。还研究了模型参数随实验条件的变化。结果表明，比反应速率随着添加剂浓度的增加和氧化锌颗粒尺寸的减小而增加。