Activated carbon was prepared from the mix of sycamore tree sawdust and polypropylene plastics by activation of K2CO3. Based on the central composite design (CCD) of response surface method (RSM), the preparation process was optimized, for the purpose of the highest methylene blue adsorption with higher iodine number. The optimum conditions were plastic content of 19wt%, K2CO3/sawdust mass ratio of 1.73, activation temperature of 958℃, and activation time of 91 min. The adsorption capacities of iodine and methylene blue were 1320.97 and 471.95 mg/g, with the predictive errors of 1.64% and 8.56%, respectively, which proves the high credibility of second-order model. The analysis of variance showed that the salt/sawdust ratio, activation temperature, and activation time were significant factors influencing the iodine adsorption capacity of activated carbon, which had a promoting effect, while plastic percentage had an inhibitory effect on the iodine adsorption capacity of activated carbon. The activation temperature and activation time had significant effects on the adsorption capacity of methylene blue on activated carbon, and had a promoting effect on the percentege of plastic. The salt/sowdust was a non-significant factor and had an inhibitory effect. The specific surface area, total pore volume and average pore size of the optimum sample were 1916.10 m2/g, 1.12 cm3/g, and 2.63 nm. Among them, the mesopore volume was 0.75 cm3/g, and the mesoporosity reached 70.10%. Compared with the activated carbon prepared by single factor optimization experiments, the specific surface area was increased by 454.11 m2/g. FT-IR analysis showed that the functional groups of the activated carbon prepared by the two optimization experiments did not change basically, and the increase of the activated carbon methylene blue adsorption was mainly due to the increase in specific surface area. The results suggested that the activated carbon optimized by response surface method has good absorptive property of macromolecules.
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