Abstract

The study successfully demonstrated an eco-friendly approach for synthesizing mesoporous alumina and mesoporous silica from coal gangue, in line with green chemistry rules. By employing natural breakdown and increased dissolution of coal gangue through specific chemical treatments, along with optimal leaching conditions, this study achieved a dissolution efficiency of over 98% for aluminum. This process, which includes leaching, separation, simultaneous precipitation, selective dissolution, gel formation, and calcination, produced mesoporous alumina and mesoporous silica without the need for templates. The results presented that the synthesized mesoporous alumina and silica had purities of 98.81% and 99.08%, respectively. Additionally, the synthesized mesoporous alumina and silica had specific surface areas of 340.15 and 392.85 m2/g, and average pore sizes of 7.27 and 3.25 nm, confirming the desirable physical properties of the synthesized γ-Al2O3 and SiO2. These products offer a sustainable solution to environmental issues caused by coal accumulation, with promising applications across various industries.

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