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生物质化学工程 ›› 2020, Vol. 54 ›› Issue (3): 9-17.doi: 10.3969/j.issn.1673-5854.2020.03.002

• 研究报告 • 上一篇    下一篇

蒲草叶基活性炭的制备及性能研究

李瑶,于淼,吕冬,王立娟*()   

  1. 东北林业大学 生物质材料科学与技术教育部重点实验室, 黑龙江 哈尔滨 150040
  • 收稿日期:2019-05-05 出版日期:2020-05-30 发布日期:2020-06-13
  • 通讯作者: 王立娟 E-mail:donglinwlj@163.com
  • 作者简介:李瑶(1995-),女,江苏徐州人,硕士生,主要从事生物质基碳材料的研究
  • 基金资助:
    中央高校基础研究基金(E2572017EB05)

Preparation and Properties of Cattail-leaf-based Activated Carbon

Yao LI,Miao YU,Dong LYU,Lijuan WANG*()   

  1. Key Laboratory of Bio-based Materials Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
  • Received:2019-05-05 Online:2020-05-30 Published:2020-06-13
  • Contact: Lijuan WANG E-mail:donglinwlj@163.com

摘要:

以蒲草叶(CL)为原料、CO2为活化剂,采用两步法制备蒲草叶基活性炭(CL-AC)。利用SEM和BET对CL-AC的结构和形貌进行表征。结果表明CL-AC具有发达的孔隙结构。活化温度800℃、活化时间20 min条件下制得的活性炭样品(CL-AC3)的比表面积最高,达到570.03 m2/g。5 000次循环后,CL-AC3的电容保持率为90.56%。当电流密度为0.5 A/g时,比电容达到111 F/g。采用单因素试验对CL-AC3吸附亚甲基蓝的条件进行优化,结果表明,较优吸附条件为吸附剂投加量12.5 mg、溶液初始质量浓度50 mg/L、温度303.15 K、吸附时间300 min,该条件下吸附量达到199.22 mg/g。亚甲基蓝在CAC上的吸附过程遵循准二级动力学模型和Langmuir等温线,吸附过程是自发吸热。

关键词: 蒲草叶基活性炭, 电化学, 吸附, 亚甲基蓝

Abstract:

Activated carbon(CL-AC) was prepared from cattail leaves(CL) by two-step procedures using CO2 as activation agent.The structure and morphology of CL-AC were characterized by scanning electron microscopy and nitrogen adsorption.The activated carbon(CL-AC3) obtained under activation temperature 800 ℃ and activation time 20 min had the maximum specific surface area(570.03 m2/g).And CL-AC3 resulted in outstanding capacitance retention of 90.56% over 5 000 cycles.The specific capacitance reached 111 F/g at the current density of 0.5 A/g.The adsorption conditions of methylene blue on CL-AC3 were optimized by single factor test and the optimum conditions were absorbent 12.5 mg, initial mass concentration of methylene blue 50 mg/L, temperature 303.15 K and time 300 min, under these conditions the adsorption capacity reached 199.22 mg/g.The adsorption process and equilibrium of methylene blue on CAC closely obeyed the pseudo-second-order kinetic model and Langmuir isotherm.The adsorption was endothermic, spontaneous, and a physically controlled process.

Key words: cattail-leaf-based activated carbon, electrochemical, adsorption, methylene blue

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