Preparation And Application Of Activated Carbon From The Timber Surplus Of Eucalyptus

The activated carbon was prepared by a variety methods with the timber surplus of eucalyptus. the preparation conditions of activated carbon were optimized by orthogonal experiments. The suitable technology on preparation activated carbon with phosphorice acid by microwave irradiation was obtained: the weight ratio of phosphorice acid to the timber surplus of eucalyptus was2:1, the phosphorice acid solution mass concentration was60%, impregnating time was36h, microwave irradiation time was25min, the activated carbon (A-10) yield reach38.80%, the adsorption on phenol was158mg·g-1, the methylene cyanine adsorption value was235mg·g-1, the specific surface area can reach923m2·g-1; the suitable technology on preparation activated carbon with zinc chloride by microwave irradiation was obtained:the weight ratio of zinc chloride to the timber surplus of eucalyptus was2:1, pH value was2, impregnating time was16h, irradiation time was23min, the activated carbon (C-2) yield reach33.67%, the adsorption on phenol was101.18mg·g-1, the methylene cyanine adsorption value was255mg·g-1, the iodine adsorption value was1124mg·g-1, the Cr(Ⅵ) adsorption capacity was6.29mg·g-1, the specific surface area can reach1656mg·g-1; the suitable technology on preparation activated carbon with potassium hydroxide by muffle oven was obtained:the weight ratio of potassium hydroxide to the timber surplus of eucalyptus was4:1,calcinating time was30min, the calcinating temperature was900℃,the activated carbon (B-7) yield reach26.27%, the methylene cyanine adsorption value was308mg-g-1, the iodine adsorption value was1938mg·g-1, the specific surface area can reach1578m2·g-1; the suitable technology on preparation activated carbon with sodium hydroxide by muffle oven was obtained:the weight ratio of sodium hydroxide to the timber surplus of eucalyptus was2:1; calcinating time was30min, the calcinating temperature was700℃,the activated carbon (D-1) yield reach13.32%, the iodine adsorption value was899mg·g-1, the specific surface area can reach1153m2·g-1.When the weight ratio of phosphorice acid to the timber surplus of eucalyptus was2:1, the phosphorice acid solution mass concentration was60%, impregnating time was36h, calcinating time was30min, the activated carbon (A-11) was prepared with phosphorice acid by the tube furnace, the specific surface area can reach1697m2·g-1; the activated carbon was prepared with potassium hydroxide by muffle oven,when the weight ratio of potassium hydroxide to the timber surplus of eucalyptus was3:1, calcinating time was35min, the calcinating temperature was900℃, Using pipe furnace to activate the carbon,when the activating time was1h and the activating temperature was900℃,the specific surface area of the activated carbon (B-15) can reach1677m2·g-1; the activated carbon was prepared with when the weight ratio of potassium hydroxide to the timber surplus of eucalyptus was2:1, calcinating time was30min, activating temperature was700℃, Using pipe furnace to activate the carbon when the activating time was1h and the activating temperature was800℃, the specific surface area of the activated carbon (D-10) increased to1364m2·g-1, the iodine adsorption increased to1173mg·g-1,the yield drop to6.54%.The average pore size of the activated carbon A-11、B-7、C-2、D-1were4.025nm、2.420nm、2.871nm、2.271nm. The adsorption adesorption isothermal curves of the activated carbon A-11were attributed type IV, the C-2were closely to the combination shape of I type and IV type,the B-7and D-1are attributed type IV isotherms. The X-ray diffraction spectrums of the activated carbon contain the graphite characteristic peaks. the porous, multi-layer microscopic structure of the activated carbon could be observed on TEM. The acid-base titration and infrared spectralanalysis method were used,the carboxyl, phenol hydroxyl, and lactones groups could be determined on the activated carbon surface.The Cr (VI) adsorption capacity was closely related to acidity. The adsorption capacity and adsorption rate of activated carbon increased with the rise of the temperature. The kinetic studies showed that the pseudo second-order rate equation could fit the experimental data well. The activated carbon which was produced by the selected of using zinc chloride has a good adsorption property thus having certain promising application in the future.