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生物质化学工程 ›› 2022, Vol. 56 ›› Issue (1): 1-6.doi: 10.3969/j.issn.1673-5854.2022.01.001

• 研究报告 • 上一篇    下一篇

磷酸法玉米秸秆基活性炭的制备及其表征

徐茹婷1,2, 卢辛成1,2, 许伟1,2, 王傲1,2, 孙康1,2,*()   

  1. 1. 中国林业科学研究院 林产化学工业研究所; 生物质化学利用国家工程实验室; 国家林业和草原局林产化学工程重点实验室; 江苏省生物质能源与材料重点实验室, 江苏 南京 210042
    2. 南京林业大学 江苏省林业资源高效加工利用协同创新中心, 江苏 南京 210037
  • 收稿日期:2020-10-21 出版日期:2022-01-30 发布日期:2022-01-18
  • 通讯作者: 孙康 E-mail:sunkang0226@163.com
  • 作者简介:孙康,研究员,博士,硕士生导师,主要从事生物质基炭材料基础与应用研究;E-mail:sunkang0226@163.com
    徐茹婷(1994—),女,安徽宣城人,研究实习员,硕士,主要从事炭质吸附材料的制备与应用研究
  • 基金资助:
    国家重点研发计划资助项目(2019YFD1100604)

Preparation and Characterization of Corn Straw Based Activated Carbon by Phosphoric Acid Activation

Ruting XU1,2, Xincheng LU1,2, Wei XU1,2, Ao WANG1,2, Kang SUN1,2,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-10-21 Online:2022-01-30 Published:2022-01-18
  • Contact: Kang SUN E-mail:sunkang0226@163.com

摘要:

以成型、烘焙处理后的玉米秸秆为原料,磷酸作为活化剂制备了玉米秸秆基活性炭,并对活性炭样品进行表征。同时以碘吸附值、亚甲基蓝吸附值和焦糖脱色率为指标测定其吸附性能,并对制备条件进行优化。实验结果表明:玉米秸秆制备活性炭的最佳工艺条件为浸渍比即m(55%H3PO4)∶m(玉米秸秆)为4∶1、活化温度400 ℃、活化时间100 min,此条件下活性炭的得率为47.78%,制得的活性炭具有良好的吸附性能,碘吸附值、亚甲基蓝吸附值及焦糖脱色率分别达到864 mg/g、210 mg/g和100%。活性炭比表面积可达1 105 m2/g,总孔容积为0.745 cm3/g,微孔孔容为0.287 cm3/g,中孔孔容为0.354 cm3/g,孔径分布集中于5 nm以内,约占73.56%,平均孔径为2.697 nm。FT-IR分析显示:在活化过程中磷酸与玉米秸秆发生交联作用,生成的活性炭损失了玉米秸秆的部分官能团。

关键词: 玉米秸秆, 活性炭, 磷酸法, 制备

Abstract:

Corn straw based activated carbon was prepared from corn straw after formed and torrefied by H3PO4 activation and characterized by N2 adsorption, elemental analysis and FT-IR. The results showed that the optimal conditions were the impregnated ratio of 4∶1, the activation temperature of 400 ℃ and the activation time of 100 min. Under these conditions, the yield of activated carbon was 47.78% and the activated carbon showed excellent adsorption capacity with the iodine adsorption value of 864 mg/g, the methylene blue adsorption of 210 mg/g and the caramel decolorization of 100%. The specific surface area and the total volume of activated carbon reached 1 105 m2/g and 0.745 cm3/g, the micropore volume was 0.287 cm3/g, the mesopore volume was 0.354 cm3/g. Meanwhile, the distribution of pore was concentrated within 5 nm, accounting for 73.56%, and the average pore diameter is 2.697 nm. The FT-IR results showed that the crosslinking reaction was occured between H3PO4 and corn straw during octivation and the activated carbon lost some functional groups of corn straw.

Key words: corn straw, activated carbon, phosphoric acid, preparation

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