CAJ | 학술논문

采用热重分析仪(TG-DTG)分析了 NH4 H2 PO4活化甘蔗叶时的热解历程和活化反应机理,研究了活化剂浓度、液料比、浸泡时间、活化温度及活化时间等工艺因素对甘蔗叶活性炭样品得率、碘吸附值的影响,并运用扫描电子显微镜(SEM)对甘蔗叶及其活性炭样品进行了表征.结果表明,甘蔗叶制备活性炭的反应为4C＋2NH4 H2 PO4→P2 O3＋CH4↑＋CO2↑＋2CO↑＋2NH3↑＋H2 O↑甘蔗叶活性炭的碘吸附值随着活化时间的延长而增加,随着活化剂浓度、液料比、浸泡时间、活化温度的增加而呈现先增后减的变化规律；甘蔗叶活性炭的最优制备工艺条件为活化剂浓度2．5％(质量分数),液料比为5∶1,浸泡时间为20 h,活化温度为700℃,活化时间为60 min,所制备的活性炭样品具有丰富的管束结构,其得率和碘吸附值分别为30．9％、993．33 mg/g.
채용열중분석의(TG-DTG)분석료 NH4 H2 PO4활화감자협시적열해역정화활화반응궤리,연구료활화제농도、액료비、침포시간、활화온도급활화시간등공예인소대감자협활성탄양품득솔、전흡부치적영향,병운용소묘전자현미경(SEM)대감자협급기활성탄양품진행료표정.결과표명,감자협제비활성탄적반응위4C＋2NH4 H2 PO4→P2 O3＋CH4↑＋CO2↑＋2CO↑＋2NH3↑＋H2 O↑감자협활성탄적전흡부치수착활화시간적연장이증가,수착활화제농도、액료비、침포시간、활화온도적증가이정현선증후감적변화규률；감자협활성탄적최우제비공예조건위활화제농도2．5％(질량분수),액료비위5∶1,침포시간위20 h,활화온도위700℃,활화시간위60 min,소제비적활성탄양품구유봉부적관속결구,기득솔화전흡부치분별위30．9％、993．33 mg/g.
The pyrolysis reactions of sugarcane leaves activated by NH4 H2 PO4 were carried out using the ther-mo-gravimetric analyzer to analysis the pyrolysis mechanism,the influencing factors on the yield and adsorption capacity of the activated carbon such as activator concentration,the ratio of activator solution to sugarcane leav-es,soaking time,activating temperature and time were systematically investigated,and the microstructure of samples was characterized by means of scanning electron microscope(SEM).The results show that the activa-tion mechanism of sugarcane leaves was as follow:4C+2NH4 H2 PO4→P2 O3+CH4↑+CO2↑+2CO↑+ 2NH3↑+H2 O↑The iodine adsorption value of the samples would increase with prolong the activation time,and increase first and then decrease with the increase of activator concentration,the ratio of activator solution to sugarcane leaves,soaking time or activation temperature.The suitable preparation conditions was as follows:sugarcane leaves was infused 20 h in 2.5wt% ammonium dihydrogen phosphate with the ratio of activator solution to sug-arcane leaves 5∶1,and treated 60 min at 700 ℃,the sugarcane leaves-based activated carbon has abundant por-ous microstructures,and the yield and iodine adsorption value of the specimen were 29.33% and 987.69 mg/g, respectively.