Effect of heat treatment temperature of sugarcane leaves on chemical composition for use in glass preparation

Abstract

The purpose of this experiment was to study the effect of heat treatment temperature of sugarcane leaves on chemical composition for use in glass preparation. Sugarcane leaf samples were collected from agricultural areas in Nakhon Pathom Province. Then, sugarcane leaf ashes were prepared by heating them at various temperatures (400, 600, 800, 1000 C) and then analyzed for their chemical composition. It was found that the main chemical component of sugarcane leaves is silica (SiO2), which has an amount of 68.87 wt%. Additionally, contaminants known to influence color formation in glass, such as MnO, Fe2O3 and CuO, were detected. When baked at an increased temperature, it did not significantly affect the amount of silica (SiO2). Following this, a glass formula was developed using sugarcane leaf ash instead of SiO2 at the following mole ratios: 55SiO2 : 13B2O3 : 20Na2O : 6.3CaO : 4.5BaO : 1Al2O3 : 0.2Sb2O3 mol%. The glass was then melted continuously at a temperature of 1200 C for 6 hours, followed by anneal at 500 C for 3 hours. The cooled glass was then polished to dimensions of 1. 0 × 1. 5 × 0. 3 cm3 for property analysis, including density, refractive index, absorbance, color, and hardness. It was found that the glass samples obtained at all temperatures were clear. It has a light- yellow color. The color of the glass samples is not significantly dependent on the higher heating temperature. The hardness of the glass sample is approximately 5. 5 on the Mohs scale, which is comparable to the hardness of apatite. It was also found that the temperature used in heating sugarcane leaf ash had no effect on the hardness of the glass. Density value and the refractive index tends to increase as the heating temperature increases. Analysis of the absorbance value in the wavelength range of 200 - 1100 nm found that the peak of the absorbance value in the wavelength range of 200 - 1100 nm occurs at a wavelength of approximately 1,048 nm, which is caused by the change of energy lever from 5E(D) to 5T2(D) of Fe2+ ions.