Wide pH Range Dye Adsorption Performance and Mechanism of Bisindole-based Porous Polymer

Zi-qi Wu; Ye-wei Xu; Min Zheng; Yang-qing Mao; Jia-li Zhu; Chun-yan Yang; Bing Zhao; Ming-ru Zhou; Shu-en Liang; Guan-jun Chang

doi:10.11777/j.issn1000-3304.2025.25093

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Wide pH Range Dye Adsorption Performance and Mechanism of Bisindole-based Porous Polymer

Research Article | 更新时间：2026-05-11

- Wide pH Range Dye Adsorption Performance and Mechanism of Bisindole-based Porous Polymer
  增强出版
- Acta Polymerica Sinica Vol. 56, Issue 10, Pages: 1777-1790(2025)
- 作者机构：
  
  1.西南科技大学，材料与化学学院，绵阳 621010
  2.西南科技大学，生物质材料教育部工程研究中心，绵阳 621010
  3.四川冠慕思杨新材料科技有限公司绵阳 621010
  4.中国工程物理研究院化工材料研究所绵阳 621900
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25093
  CLC：
- CSTR：32057.14.GFZXB.2025.7430
- Received：08 April 2025，
  
  Accepted：27 May 2025，
  
  Online First：31 July 2025，
  
  Published：20 October 2025
- 稿件说明：
移动端阅览
吴紫琪, 徐业伟, 郑敏, 毛扬庆, 朱家丽, 杨春燕, 赵兵, 周明如, 梁书恩, 常冠军. 双吲哚基多孔聚合物的宽pH范围染料吸附性能与机理研究. 高分子学报, 2025, 56(10), 1777-1790

Wu, Z. Q.; Xu, Y. W.; Zheng, M.; Mao, Y. Q.; Zhu, J. L.; Yang, C. Y.; Zhao, B.; Zhou, M. R.; Liang, S. E.; Chang, G. J. Wide pH range dye adsorption performance and mechanism of bisindole-based porous polymer. Acta Polymerica Sinica, 2025, 56(10), 1777-1790
吴紫琪, 徐业伟, 郑敏, 毛扬庆, 朱家丽, 杨春燕, 赵兵, 周明如, 梁书恩, 常冠军. 双吲哚基多孔聚合物的宽pH范围染料吸附性能与机理研究. 高分子学报, 2025, 56(10), 1777-1790 DOI： 10.11777/j.issn1000-3304.2025.25093. CSTR： 32057.14.GFZXB.2025.7430.

Wu, Z. Q.; Xu, Y. W.; Zheng, M.; Mao, Y. Q.; Zhu, J. L.; Yang, C. Y.; Zhao, B.; Zhou, M. R.; Liang, S. E.; Chang, G. J. Wide pH range dye adsorption performance and mechanism of bisindole-based porous polymer. Acta Polymerica Sinica, 2025, 56(10), 1777-1790 DOI： 10.11777/j.issn1000-3304.2025.25093. CSTR： 32057.14.GFZXB.2025.7430.

摘要

鉴于阳离子染料引发的水体污染问题日益严峻，本研究致力于开发一种高效的吸附剂以应对这一挑战. 采用一步法策略，以3

3'-二吲哚甲烷为原料，经Friedel-Crafts烷基化反应构建了具有供电子亚甲基功能化的吲哚基多孔有机聚合物(PDIM). 选用亚甲基蓝(MB)作为典型阳离子染料对其吸附性能与机理进行系统探究. 相较于现有报道材料中存在的pH局限性，PDIM在pH=2~12的范围内对MB表现出卓越的吸附能力，其最大吸附容量达621.92 mg/g，仅30 min内即可达到最大吸附量的87%，80 min实现吸附平衡. 同时，PDIM对MB表现出优异的选择性吸附能力，且在多种共存离子干扰下仍保持稳定的吸附性能. 此外，PDIM还具有良好的可重复使用性. 吸附机制研究表明，PDIM对MB的吸附主要依赖于阳离子-

相互作用和

相互作用，其中亚甲基的引入有效增强了PDIM与MB之间的非键作用. 特别地，PDIM对其他阳离子染料在宽pH范围内同样具有优异的吸附性能，表明PDIM在处理阳离子染料污染时具有广泛的适用性.

Abstract

The increasing environmental threat posed by cationic dye contamination in aquatic systems has heightened the demand for innovative and efficient remediation strategies. In this study

a novel indole-based porous organic polymer (PDIM)

functionalized with electron-rich methylene groups

was designed and synthesized to address this challenge. PDIM was synthesized

via

a one-step Friedel-Crafts alkylation reaction using 3

3'-diindolylmethane as the monomer

2-dichloroethane as the solvent

and FeCl

as a catalyst. By optimizing the reaction conditions (80 ℃ for 18 h)

PDIM achieved a hierarchical pore structure and a high Brunauer-Emmett-Teller (BET) surface area of 459.82 m

the majority of the pore sizes are concentrated around 4.29 nm

providing abundant active sites for adsorption. Methylene blue (MB) was selected as a representative cationic dye to systematically investigate the adsorption performance and mechanism of PMIM. Compared to existing materials with pH limitations reported in the literature

PDIM demonstrates exceptional adsorption capacity for MB across a pH

range of 2-12. The maximum adsorption capacity reached 621.92 mg/g

achieving 87% of the equilibrium value within 30 min and attaining adsorption equilibrium within 80 min. Meanwhile

PDIM exhibited excellent selective adsorption of MB and maintained stable adsorption performance under the interference of multiple co-existing ions. In addition

PDIM has good reusability. The adsorption mechanism of PDIM was investigated using ultraviolet-visible (UV-Vis) spectroscopy

Fourier-transform infrared (FTIR) spectroscopy

and density functional theory (DFT). The results revealed that the adsorption of MB by PDIM is primarily driven by the synergistic effects of cation-

and

interactions

and the introduction of methylene groups effectively enhanced the non-covalent interactions between PDIM and MB. Furthermore

PDIM exhibited excellent adsorption performance toward other cationic dyes over a broad pH range

demonstrating its broad applicability in treating cationic dye pollution. This work not only provides a novel and efficient adsorbent for cationic dye remediation but also opens a new avenue for designing pH-universal functionalized porous materials

offering significant implications for advancing water treatment technologies.

关键词

Keywords

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