烘焙预处理对玉米秸秆磷酸法活性炭制备及性能影响  

Effects of Torrefaction Pretreatment on the Preparation and Properties of Activated Carbon from Corn Straw by Phosphoric Acid Activation

作　　者：徐茹婷 卢辛成[1] 孙康[1] 檀畅 张燕萍[1] XU Ruting;LU Xincheng;SUN Kang;TAN Chang;ZHANG Yanping(Institute of Chemical Industry of Forest Products,CAF,Key Lab. of Biomass Energy and Material,Jiangsu Province,Key Lab. of Chemical Engineering of Forest Products,National Forestry and Grassland Administration,National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass,Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing 210042,China)

机构地区：[1]中国林业科学研究院林产化学工业研究所,江苏省生物质能源与材料重点实验室,国家林业和草原局林产化学工程重点实验室,林木生物质低碳高效利用国家工程研究中心,江苏省林业资源高效加工利用协同创新中心,江苏南京210042

出　　处：《生物质化学工程》2022年第4期1-8,共8页Biomass Chemical Engineering

基　　金：国家重点研发计划(2019YFD1100604)。

摘　　要：以玉米秸秆为原料,研究烘焙预处理对磷酸法活性炭的制备及性能影响。研究结果表明:烘焙预处理使玉米秸秆碳元素含量和固定碳含量增加而挥发分含量降低,增加热解焦炭质量,且烘焙温度影响强于烘焙时间。烘焙处理使玉米秸秆活性炭比表面积先增加后减小,总孔容和中孔率减小,而微孔率显著增加。烘焙预处理有助于提高活性炭吸附性能,当100 g粒径为154~450μm玉米秸秆颗粒经烘焙预处理,预处理条件为烘焙温度240℃、烘焙时间60 min时,预处理后的玉米秸秆含C 51.32%,固定碳27.64%,灰分4.72%。采用磷酸活化法将预处理后的玉米秸秆制备成活性炭,制备条件为浸渍比1∶4(玉米秸秆与55%磷酸溶液的质量比),浸渍温度140℃,浸渍时间90 min,活化温度400℃,活化时间60 min,此条件下制备的玉米秸秆活性炭比表面积达1317.05 m^(2)/g,碘吸附值、亚甲基蓝吸附值和焦糖脱色率分别为876 mg/g、210 mg/g和100%。The effects of torrefaction pretreatment on the preparation and properties of activated carbon by phosphoric acid using corn straw as the raw materials were studied.The results showed that the contents of carbon and fixed carbon were increased and the volatile content was reduced using torrefaction pretreatment which increased the quality of pyrolytic carbon.The effect of torrefaction temperature was stronger than that of torrefaction time.By torrefaction pretreatment,the specific surface area of activated carbon increased firstly and then decreased,the total pore volume and the mesoporosity decreased,while the microporosity increased significantly.The adsorption performance of activated carbon could be improved by torrefaction pretreatment.As 100 g corn straw with the particle size of 154-450μm were pretreated under the torrefaction temperature of 240℃and torrefaction time of 60 min,the pretreated corn straw contained carbon,fixed carbon,and ash with the mass fractions of 51.32%,27.64%and 4.72%,respectively.The activated carbon was prepared from the pretreated corn straw under the impregnation ratio of 1∶4(i.e.,the mass ratio of the pretreated corn straw and 55%phosphate acid),dipping temperature of 140℃,dipping time of 90 min,activated temperature of 400℃,activated time of 60 min,the specific surface area of the obtained activated carbon reached 1317.05 m2/g,and the values of iodine adsorption,methylene blue adsorption,and caramel decolorization were 876 mg/g,210 mg/g and 100%,respectively.

关 键 词：玉米秸秆 烘焙 磷酸法 活性炭 性能 

分 类 号：TQ35[化学工程] TQ42