Abstract High surface area biogenic silica nanoparticles extracted from rice husks (RH) were synthesized through a surfactant-free process by employing a design optimization of the Taguchi approach. This approach is a systematic and efficient method to design factorial experiments with a minimum number of experiments. Here, the amount of rice husk ash, pH and aging time were adopted as design parameters to determine the particle size and structural properties including porosity and surface area in the synthetic process. The average particle size of silica nanoparticles ranging 24–87 nm and surface area to ∼740.77 m2/g could be tuned in the factorial optimization, where the degree of parameters that influence the structural properties were investigated, combined with surface characterizations. The surface area, pore volume and pore size of the samples were analyzed by adsorption–desorption characteristics of N2 gas. An amount of silica contents was analyzed by X-ray fluorescence for each step of RH treatment. Scanning electron microscopy and transmission electron microscopy were utilized to show the morphology and primary particle size of the silica nanoparticle. The analysis showed that the optimized experimental parameters calculated based on “signal” to “noise” ratio derived from Taguchi approach shortened the number of experimental variations with a noticeable improvement of surface area, whose individual effects are elucidated. This synthetic technology of biogenic nano silica with high surface area based on the Taguchi approach has potential for efficient time savings and quality control strategies to optimize the synthetic process.

中文翻译：

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利用田口方法无表面活性剂合成源自稻壳的高表面积二氧化硅纳米粒子

摘要 采用田口方法的设计优化，通过无表面活性剂的工艺合成了从稻壳 (RH) 中提取的高表面积生物二氧化硅纳米粒子。这种方法是一种系统而有效的方法，可以用最少的实验设计析因实验。在这里，稻壳灰的量​​、pH 值和老化时间被用作设计参数，以确定合成过程中的颗粒大小和结构特性，包括孔隙率和表面积。二氧化硅纳米粒子的平均粒径范围为 24-87 nm，表面积约为 740.77 m2/g，可以在因子优化中进行调整，其中研究影响结构特性的参数程度，并结合表面特征。表面积，通过 N2 气体的吸附-解吸特性分析样品的孔体积和孔径。对于RH处理的每个步骤，通过X射线荧光分析二氧化硅含量。使用扫描电子显微镜和透射电子显微镜来显示二氧化硅纳米颗粒的形态和初级粒径。分析表明，基于从田口方法得出的“信号”与“噪声”比计算的优化实验参数缩短了实验变化的数量，表面积显着改善，其个体效应得到阐明。这种基于田口方法的高表面积生物纳米二氧化硅合成技术具有有效节省时间和质量控制策略以优化合成过程的潜力。