Abstract
A large amount of remaining fly ash has been piled up or landfilled, which not only a waste of land resources but also results in a series of environmental problems. Therefore, using fly ash to produce high value-added products is a win-win development orientation between human beings and nature. In this study, zeolite A is successfully synthesized using a hydrothermal method using fly ash. Additionally, it is at 1.0 mol·L−1 of the alkali concentration that the crystallinity of zeolite A reaches the maximum value, about 96.6%. FTIR research shows that the main secondary structural unit D4R vibration band of zeolite A appears at 555 cm−1. The results of the SEM study indicate the structure of zeolite A is cubic. The TEM results show that the crystal structure of the zeolite A belongs to the body-centered cubic structure. Meanwhile, the positively charged sodium ions cooperate with the silicon oxygen tetrahedron and the aluminum oxygen tetrahedron to form the zeolite A skeleton. Carbon dioxide adsorption equilibrium study shows that the maximum adsorption capacity of zeolite A of 46.5 mL·g−1 is significantly higher than the maximum adsorption capacity of commercial-grade zeolite 4A of 39.3 mL·g−1. In addition, the application of the Langmuir model in the adsorption of carbon dioxide by commercial-grade zeolite 4A and zeolite A is studied, which not only extends the application of zeolite A, but can be further extended to other zeolite materials as well. Meanwhile, the adsorption process belongs to the Langmuir model, which is a single layer adsorption on an ideal surface.
Highlights
As a typical kind of fossil fuel, coal is distributed widely in the world [1,2,3]
The amount of coal consumed for power generation and industrial combustion is increasing rapidly, and a large amount of fly ash is produced [4]
Fly ash produced from coal-fired power generation is approximately 500 million tons each year in China, but about 50% of fly ash waste is underutilized and is piled up or buried in the garbage pool [5,6]
Summary
The amount of coal consumed for power generation and industrial combustion is increasing rapidly, and a large amount of fly ash is produced [4]. Landfilling a large amount of fly ash will aggrandize these toxic substances [7], and once the leachate of the landfill leaks, it is doomed to cause a huge environmental risks and irreparable environmental disasters. Fly ash is a kind of solid waste which has become one of the serious pollution sources. It brings about atmospheric pollution, but threatens to human health and soil as well [8]. It is urgent to think about recycling and reusing the fly ash
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