The Adsorption and Desorption Behavior of CH_4 on Jincheng Anthracite Modified in Fe~(3+) and Cu~(2+) Ion Electrolytes

摘要

The anthracite was electrochemically treated in Fe-2(SO4)(3) and CuSO4 electrolytes, and the adsorption capacity and desorption ratio of CH(4 )on the anthracite were investigated using adsorption and desorption tests. The experimental results demonstrated that the saturated adsorption capacity of CH4 on anthracite decreased from 41.49 to 38.31 mL g(-1) after being modified by the Fe3+ ion electrolyte and further decreased to 34.84 mL g(-1) after being modified by the Cu2+ ion electrolyte. The CH4 desorption ratio increased from 63.43 to 73.66% and 84.87% after modification in Fe3+ and Cu2+ ion electrolytes, respectively, and this improvement was caused by the enlargement of the diffusion coefficient D. The effect of the Cu2+ electrolyte on CH4 adsorption/desorption was better than that of the Fe3+ electrolyte, and the mechanism was analyzed by the changes in the surface energy, functional groups, and pore characteristics before and after modification. The results obtained from this work provide a basis for the optimization of ion electrolytes when accelerating methane extraction via an electrochemical method.