Adsorption performance and mechanism of MB and phenol on activated carbon prepared from coal heavy component
High surface area activated carbons were prepared using the heavy components(HC)from Tongting coal as the raw material and KOH as the activating agent.The effects of the KOH/HC mass ratios on the pore structure of the activated carbon and its adsorption performance towards methylene blue and phenol were investigated.The results show that the activated carbon AC-4 exhibites the high-est specific surface area of 3 752 m2/g and a maximum adsorption capacity of 1 996.74 mg/g with a remarkable adsorption rate of 99.84％for a MB solution with an initial concentration of 2 000 mg/L.In contrast,the activated carbon AC-2 demonstrates a maximum adsorption capacity of 107.08 mg/g with a high adsorption rate of 89.23％for a phenol solution with an initial concentration of 120 mg/L.The activated carbon has different adsorption mechanisms for methylene blue and phenol.The adsorption of methylene blue is primarily attributed to pore filling,whereas the adsorption of phenol is mainly governed by π-π interactions.
Activated carbonadsorptioncoal heavy componentmethylene bluephenol
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