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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (4): 20-28.doi: 10.3969/j.issn.0253-2417.2018.04.004

• 研究报告 • 上一篇    下一篇

N掺杂炭气凝胶的水热制备及其金属离子吸附性能

孙佳明, 鄂雷, 马春慧, 李伟, 刘守新   

  1. 东北林业大学 材料科学与工程学院, 黑龙江 哈尔滨 150040
  • 收稿日期:2018-04-19 出版日期:2018-08-25 发布日期:2018-08-10
  • 通讯作者: 刘守新,博士生导师,研究领域为生物质炭材料;E-mail:liushouxin@126.com。 E-mail:liushouxin@126.com
  • 作者简介:孙佳明(1995-),女,黑龙江海伦人,博士生,主要从事生物质炭材料研究工作
  • 基金资助:
    国家重点研发计划资助项目(2017YFD0601006);国家自然科学基金资助项目(31570567);中央高校基本科研业务费专项资金资助(2572017ET02)

Preparation and Metal Ion Adsorption Performance for Heavy Metals of Nitrogen-doped Carbon Aerogels Prepared from Cellulose via Hydrothermal Carbonization Method

SUN Jiaming, E Lei, MA Chunhui, LI Wei, LIU Shouxin   

  1. College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2018-04-19 Online:2018-08-25 Published:2018-08-10

摘要: 以微晶纤维素为原料,卵清蛋白(OVA)为N源,采用水热炭化法制备N掺杂炭气凝胶(NCA)。利用SEM、氮气的吸附脱附、XRD、FT-IR和XPS对NCA表面形貌、孔径结构、晶相结构和表面化学组成进行表征,并以Pb2+和Cr6+为模型物评价NCA对重金属离子的吸附性能。结果表明:所制备的NCA是由无定形炭组成的三维网状立体结构,BET比表面积为134.48 m2/g,平均孔径为12.28 nm,总孔容为0.413 0 m3/g;NCA由C、N、O组成,XPS表明其表面存在CO,—COOH以及C—N等官能团,其中N元素以亚硝酰、氨基、吡啶N和季铵N的形式存在。NCA对Pb2+和Cr6+的吸附过程更符合Langmuir等温模型和准二级动力学模型,25℃时NCA对Pb2+和Cr6+的最大吸附量分别为223.98 mg/g和35.12 mg/g,而CA对Pb2+和Cr6+的最大吸附量分别为65.78 mg/g和16.65 mg/g。NCA对重金属离子的吸附效果明显优于未掺杂N的炭气凝胶(CA)。

关键词: 生物质, 水热法, N掺杂, 炭气凝胶, 吸附

Abstract: Nitrogen-doped carbon aerogel (NCA) was prepared via hydrothermal carbonization with microcrystalline cellulose(MCC) as precursor and ovalbumin (OVA) as dopant. Here, ovalbumin acted double roles:One was the donor of nitrogen source, the other was the structural directing agent. Morphology, pore structure, crystal structure and surface chemical properties of NCA were characterized by scanning electron microscope (SEM), nitrogen adsorption-desorptiom, X-ray diffraction(XRD), Fourier transform infrared-spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS). Pb2+ and Cr6+ were used as adsorption substrates to explore the adsorption properties of NCA in the aqueous phase. Adsorption equilibria and kinetic behaviour of Pb2+ and Cr6+ were assessed by altering parameters such as agitation time and metal ions' concentration through implementing batch experiments. The results showed that the NCA was amorphous with three-dimensional network structure; specific surface area of NCA was 134.48 m2/g; average pore diameter was 12.28 nm; total pore volume was 0.413 0 m3/g. NCA was mainly composed of element of C, N, O. C=O, -COOH and C-N functional groups were detected on the surface of NCA. N was mainly existed in the form of nitrosyl, amino, pyridine and quaternary ammonium. The adsorption process of Pb2+ and Cr6+ on NCA followed Langmuir model and the pseudo-second-order kinetic model better. NCA exhibited higher adsorption capacity and faster kinetics than CA. The maximum adsorption capacities of Pb2+ and Cr6+ on NCA at 25℃ achieved 223.98 mg/g, 35.12 mg/g, respectively and the correspondind capacities on CA were 65.78 and 16.65 mg/g.

Key words: biomass, hydrothermal, nitrogen-doped, carbon aerogel, adsorption

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