Preparation of C-Si mesoporous materials from coal gasification slag and adsorption properties of methyl orange
A low-cost preparation method of carbon silicon mesoporous materials from coal gasification slag was developed,and the factors affecting the pore structure and the adsorption performance in methyl or-ange were explored.We use the method of acid leaching to prepare carbon silicon mesoporous materials,and optimize the preparation process through the pore structure and metal oxide leaching rate of the mate-rials.The results show that temperature and time have a relatively small impact and raw material particle size and acid concentration have a significant impact.After acid leaching,raw materials with smaller parti-cle sizes have a larger specific surface area,and the acid concentration has a significant impact on carbon silicon mesoporous materials.The optimal acid concentration is 16％.The metal oxide leaching rate and residual carbon content comprehensively affect the specific surface area and pore volume.The adsorption process of carbon silicon mesoporous materials based on coal gasification slag is the closest to the pseudo second order adsorption model,and the adsorption equilibrium conforms to the Langmuir model.The maxi-mum adsorption capacity of methyl orange is 89.13 mg/g.
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