化工进展 ›› 2023, Vol. 42 ›› Issue (6): 3087-3096.DOI: 10.16085/j.issn.1000-6613.2022-1441

• 材料科学与技术 • 上一篇    下一篇

木质素-聚苯胺复合材料的制备及对刚果红的吸附

任建鹏(), 吴彩文, 刘慧君, 吴文娟()   

  1. 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:2022-08-01 修回日期:2022-09-26 出版日期:2023-06-25 发布日期:2023-06-29
  • 通讯作者: 吴文娟
  • 作者简介:任建鹏(1997—),男,硕士研究生,研究方向为天然分子改性与应用。E-mail:jpeng@njfu.edu.cn
  • 基金资助:
    国家自然科学基金(32271797)

Preparation of lignin-polyaniline composites and adsorption of Congo red

REN Jianpeng(), WU Caiwen, LIU Huijun, WU Wenjuan()   

  1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
  • Received:2022-08-01 Revised:2022-09-26 Online:2023-06-25 Published:2023-06-29
  • Contact: WU Wenjuan

摘要:

以木质素磺酸盐(Lig)为原料,采用化学聚合法与聚苯胺(PANI)复合制备出木质素/聚苯胺(Lig/PANI)复合材料。利用扫描电子显微镜、透射电镜、红外光谱等手段对材料的形貌、结构进行了表征,并研究了复合材料对刚果红(CR)的吸附性能,探究了吸附剂用量、染料初始浓度和吸附时间等因素对吸附性能的影响。结果表明,在20mg的吸附剂用量和350mg/L的起始浓度下,刚果红在200min内的吸附效果最佳,最高吸附量为431.17mg/g。该吸附过程遵循Freundlich吸附模型和准二级吸附动力模型,以化学吸附为主,属于多分子层吸附。刚果红的吸附机制主要存在着静电吸引、孔隙吸附,且吸附过程中存在电子的转移,内扩散模型表明粒子内扩散不是控制吸附速率的唯一因素;整个吸附过程是熵增、自发进行的。

关键词: 木质素, 聚苯胺, 刚果红, 吸附性能

Abstract:

Lignin/polyaniline(Lig/PANI) composite material was prepared by chemical polymerization with polyaniline(PANI) and lignosulfonate(Lig). The morphology, structure and properties of the materials were characterized by scanning electron microscopy, transmission electron microscopy and infrared spectroscopy. The adsorption properties of composite materials on Congo red was studied, and the effects of the amounts of adsorbent, initial concentration of dye, and adsorption time on the adsorption properties were investigated. The results showed that under the dosage of 20mg adsorbent and the initial concentration of 350mg/L, Congo red had the best adsorption effect within 200min and the highest adsorption capacity was 431.17mg/g. The adsorption process followed the Freundlich adsorption model and the quasi-second-order adsorption dynamic model, in which chemisorption was dominant and belonged to multi-molecular layer adsorption. The adsorption mechanism of Congo red mainly included electrostatic attraction, pore adsorption and electron transfer during the adsorption process. The internal diffusion model indicated that the internal diffusion was not the only factor controlling the adsorption rate, and the whole process of adsorption was spontaneous and entropic.

Key words: lignin, polyaniline, Congo red, adsorption performance

中图分类号: 

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