Preparation of Hierarchical Porous Carbon by Biological Induced Method and Its Adsorption Property

With campsis grandiflora as bio-template, sucrose as carbon source, NaCl as pore-forming agent and KOH as activator, hierarchical porous carbon was prepared by biological induced method. The optimum process parameters were determined and the effects of different process parameters on the microstructures and adsorption properties of the porous carbon were investigated. The results show that the optimum synthesis process parameters were obtained as follows: 1.0wt% sucrose solution, 2.0wt% NaCl solution and 1.0wt% KOH solution with volume ratio of 1∶1∶1; activation temperature of 650 ℃; activation time of 60 min. The obtained porous carbon retained the microstructure of campsis grandiflora and had a relatively narrow pore size distribution and a relatively high specific surface area of 357 m2·g-1.The adsorption property of the porous carbon was excellent. In the methylene blue solution of 120 mg·L-1, the porous carbon reached the adsorption saturation at 120 min with the adsorption capacity of 60 mg·g-1.