Asep Bayu Dani Nandiyanto, Jaaka Yarfa Alhaqqa, Meli Fiandini, Risti Ragadhita, Teguh Kurniawan
The objective of this study was to develop a method for synthesizing silica microparticles with various sizes from bamboo leaves, analyze their effectiveness in adsorbing ammonia, and propose an adsorption mechanism based on isotherm adsorption models. In the experiments, bamboo leaves were heated and burned at high temperatures to produce silica particles from bamboo leaves. To get specific sizes of silica particles (2000, 1000, and 500 μm), sieve tests were done. The analysis was supported by a microscope and a Fourier-transform infrared spectroscope (FTIR). The effectiveness of the ammonia adsorption was done using a colorimeter and the data was compared to ten isotherm models (including Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Jovanovic, Halsey, Harkin-Jura, Flory-Huggins, Fowler-Guggenheim, and Hill-De Boer) (to understand the adsorption mechanism). The study found that particle size affected the adsorption mechanism. Larger particles (i.e. 2000 and 1000 μm) generally form multilayer adsorption systems, while smaller particles (i.e. 500 μm) form monolayer systems. Larger particles allow more adsorbate molecules to interact with the surface, leading to multilayer coverage. Smaller particles exhibit physisorption, which is due to weak Van der Waals interactions and insignificant changes in Gibbs free energy, despite their high specific surface area, resulting in non-spontaneous reactions requiring additional heat and catalysts. This study highlights that larger particles typically form multilayer systems, whereas smaller particles form monolayer systems due to differences in surface area and adsorption energy. This study also adds new contributions to address pressing concern issues in Sustainable Development Goals (SDGs). © School of Engineering, Taylor’s University.
Universitas Pendidikan Indonesia, Bandung, Indonesia; Universitas Sultan Ageng Tirtayasa, Serang, Indonesia Jl. Dr. Setiabudi No. 229, Bandung, 40154, Indonesia
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