利用废轮胎热解炭制取活性炭的试验研究

Conversion of pyrolytic chars from used tires to activated carbon

热解炭是废轮胎热解的重要产物之一.以CO2气体作为活化剂对废轮胎热解炭制取活性炭的活化温度为820～950℃,活化时间为60～360min.在试验条件下,活化温度越高,活化时间越长,活性炭烧失率越大,比表面积也越大.制得的活性炭具有与商业活性炭相似的中、大孔隙分布,而微孔则不发达,因此孔容积小于商业活性炭.在950℃,240min条件下得到中等比表面积(306m2/g)的活性炭.针对碘、苯酚和亚甲基蓝三种物质考察了活性炭的液相吸附特性.热解炭和活性炭对亚甲基蓝和苯酚具有良好的吸附性,而碘吸附值则与商业活性炭尚有较大差距.

Pyrolytic char, one of the most important products of used tire pyrolysis, was activated in a carbon dioxide atmosphere using a static bed reactor. Activation was conducted at 820-950°C with different intervals over 60-360 min. The burn-off and the surface area of activated carbon increased continuously with activation temperature and time. The activated carbon exhibited similar pore structures in the range of micro- and macropore with those of commercial active carbon. Activated carbon with medium surface area (306 m2/g) was obtained at 950°C and after 240 min activation. The aqueous adsorption characteristics of the activated carbon were investigated using phenol, methylene blue and iodine. The activated carbon derived from tire pyrolytic char exhibited excellent adsorption capacity for methylene blue and phenol from solution. Whereas the adsorption of iodine were lower compared with the commercial active carbon.