Efficiency of Decolorizing Agents in the Production of Colorless Commercial Glasses from Municipal Glass Cullet Wastes

摘要

Se and Co oxides have been applied in the present work as decolorizing agents to produce colorless glass from colored municipal glass cullet that contains high iron oxide. The results obtained showed that the Fe ions present in the glassy matrix are largely in the form of Fe~(3+) ions, X-ray fluorescence (XRF), Electron Spin Resonance (ESR), UV-Visible, and Fourier Transformer Infrared (FTIR) analyses were used to investigate the prepared glasses. The results reveal that all samples have a strong ultraviolet charge transfer absorption consisting of two or three bands at the wavelengths regions 228—232, 274—278, and 304—309 nm. The transmission is related to both decolorizing agent and the content of municipal glass cullet. The ESR intensity of Fe~(3+) signal remains unchanged in all samples. The IR data illustrate the appearance of characteristic absorption bands for each group of glasses in the following ranges -470, 773—1049, 1382—1617, 2323, 2919, 3436 cm~(-1) which can be attributed to Si—O—Si bending vibrations, Si—O—Si symmetric and anti-symmetric stretching of bridging oxygen, and stretching vibration of molecular water, respectively. The results indicate the ability to control the color of glasses by the addition of cullet wastes to commercial glass composition.