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摘要
Relative humidity and moisture content are the key factors affecting the adsorption abilities of activated carbons (ACs) against these physisorption-type volatile organic compounds and industrial toxic chemicals due to competitive adsorption. Water vapor adsorption/desorption behaviors on AC particles and fixed beds are of great interest in materials science, the chemical industry, and military chemistry. This work selected two typical ACs (AC and ASZM-T) used in chemical protection. Water vapor adsorption equilibrium, adsorption kinetics, dynamic adsorption/desorption curves, and axial temperature during the adsorption/desorption process were systemically investigated. Results show that water vapor adsorption-desorption isotherms belong to the "S" type with obvious triangular hysteresis loops. Adsorption curves at different temperatures almost overlap, proving the temperature-independence. Dynamic adsorption-desorption curves on the fixed beds could be divided into different stages. The duration of each stage and adsorption/desorption rate are mainly determined by the relative humidity and moisture content. The heat effect induced by water vapor adsorption/desorption could cause the fixed bed to be in a nonisothermal state, indicating that the heat transfer inside the fixed bed was mainly controlled by the water vapor mass transfer. It provides a theoretical basis for temperature-induced low-concentration multicomponent competitive adsorption under relative humidity and moisture content levels.
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