Activated carbons prepared via reflux-microwave-assisted activation approach with high adsorption capability for methylene blue

摘要: Abstract The paper reported a facile method to prepare activated carbons (ACs) with high methylene blue (MB) adsorption capabilities via reflux-microwave-assisted activation approach. low-cost agricultural waste corncob precursor was first refluxed in the aqueous solution of activating agents (i.e., ZnCl2 or KOH) for pretreatment, followed by microwave-assisted activation. reflux process significantly shortens pretreatment time 4 h, compared usually 24 h soaking traditional practice; and meanwhile greatly facilitates diffusion into precursor; whereas endows ACs hierarchical pore structures specific area (e.g, 1405 m2/g KOH pretreated AC). are also featured rich oxygen-containing functional groups such as hydroxyl on surface, exhibit capacity using MB model adsorbate because electrostatic interactions. Under optimum condition (the impregnation ratio 2:1 (wt. %), microwave power 600 W, 7 min), prepared KAC demonstrates an 636.94 mg/g. Moreover, can be readily regenerated alkaline still show satisfying performance after three times regeneration. These findings indicate feasibility preparing