Abstract

A chemical method to synthesize amorphous silica nanoparticles from the incinerated paddy straw has been introduced. The synthesis was conducted through the hydrolysis by alkaline-acidic treatments. As a result, silica particles produced with the sizes were ranging at 60–90 nm, determined by high-resolution microscopy. The crystallinity was confirmed by surface area electron diffraction. Apart from that, chemical and diffraction analyses for both rice straw ash and synthesized silica nanoparticles were conducted by X-ray diffraction and Fourier-transform infrared spectroscopy. The percentage of silica from the incinerated straw was calculated to be 28.3. The prominent surface chemical bonding on the generated silica nanoparticles was with Si–O–Si, stretch of Si–O and symmetric Si–O bonds at peaks of 1090, 471, and 780 cm⁻¹, respectively. To confirm the impurities of the elements in the produced silica, were analyzed using X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy. The stability of silica nanoparticles was investigated using thermogravimetric analysis and zeta potential. The measured size from zeta potential analysis was 411.3–493 nm and the stability of mass reduction was located at 200 °C with final amount of mass reduced ∼88% and an average polydispersity Index was 0.195–0.224.

摘要

已经介绍了从焚化的稻草中合成无定形二氧化硅纳米粒子的化学方法。通过碱-酸处理通过水解进行合成。结果，通过高分辨率显微镜测定，所产生的二氧化硅颗粒的尺寸在60-90 nm之间。通过表面积电子衍射确认结晶度。除此之外，还通过X射线衍射和傅里叶变换红外光谱对稻草灰和合成的二氧化硅纳米颗粒进行了化学和衍射分析。经焚烧的秸秆中二氧化硅的百分比经计算为28.3。生成的二氧化硅纳米粒子上的主要表面化学键为Si–O–Si，拉伸的Si–O和对称的Si–O键，峰值为1090、471和780 cm ^-1， 分别。为了确认生产的二氧化硅中元素的杂质，使用X射线光电子能谱和能量色散X射线能谱进行了分析。使用热重分析和ζ电位研究了二氧化硅纳米颗粒的稳定性。通过zeta电位分析测得的尺寸为411.3–493 nm，质量下降的稳定性位于200°C，最终质量下降了约88％，平均多分散指数为0.195–0.224。