Rice husk is a form of agricultural biomass that provides an abundant silicon dioxides source. This study use rice husk ash as a material to prepare silica. Silica powder has been synthesized by the refluxing of rice husk ash with HCl 1,2 and 3 M at different time (60 and 120 min.) and subsequently adjusting the pH using 1 M. NaOH. The silicon dioxide extraction yield reached 85% and was effect by concentration of HCl solution and reaction time. The structure of the obtained silica powder were characterized by X-Ray Fluorescence (XRF), X-Ray diffraction (XRD), CIE L*a*b* (Visible spectrophotometer) and Scanning Electron Microscope (SEM). The highest purity of silica sample were 98.7% SiO_2, CIE L*a*b* = 94.79 + 0.48 + 1.24, ΔE ≈ 3.28 (white power) and 2θ = 22° (silica). Particle had a uniform size less than 3 μm. The objective of the next study will applied synthesized silica that enhances the print quality of the printing substrates.
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机译：稻壳是一种农业生物量的一种形式，提供丰富的二氧化硅源。这项研究用米壳灰作为制备二氧化硅的材料。通过在不同时间（60和120分钟）的HCl 1,2和3M的水稻壳灰的回流合成二氧化硅粉末合成。随后使用1M. NaOH调节pH。二氧化硅萃取产率达到85％，通过浓度的HCl溶液和反应时间是效果。通过X射线荧光（XRF），X射线衍射（XRD），CIE L * A * B *（可见分光光度计）和扫描电子显微镜（SEM），表征所得二氧化硅粉末的结构。二氧化硅样品的最高纯度为98.7％SiO_2，CIE L * A * B * = 94.79 + 0.48 + 1.24，ΔE≈3.28（白色功率）和2θ= 22°（二氧化硅）。颗粒的均匀尺寸小于3μm。下一步研究的目的将应用合成二氧化硅，该二氧化硅增强印刷基材的印刷质量。
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