Environmental Chemistry Letters

, Volume 18, Issue 1, pp 251–255 | Cite as

Dual-network design to enhance the properties of agar aerogel adsorbent by incorporating in situ ion cross-linked alginate

  • Dajian HuangEmail author
  • Qiling Quan
  • Yuting Zheng
  • Wenjie Tang
  • Zhuo Zhang
  • Xiaohu Qiang
Original Paper


Natural and synthetic adsorbents are used to remove contaminants from polluted waters. In particular, polymer-based aerogels are promising but their adsorption capacity and dimensional stability should be improved. Here we propose a new design strategy to prepare a dual-network aerogel, consisting of physical cross-linked agar and Ca2+ cross-linked sodium alginate as the first and second networks, respectively. After introducing cross-linked sodium alginate into the agar matrix, the morphology of the agar aerogel transformed from a distinct layered structure to a co-continuous network. The swelling degree ratio of the agar aerogel is reduced, and the dimensional stability was  improved by introducing ion cross-linked sodium alginate into the agar matrix. The aerogels were used as adsorbents to remove methylene blue from aqueous solutions. The adsorption capacity of the agar aerogel was remarkably improved by adding sodium alginate due to the increase in electrostatic attraction and adsorption site.


Agar Alginate Ionic cross-linked Double network aerogel Adsorbent 



The authors would like to thank the funding of the Science and Technology Support Project of Natural Science Foundation of the Gansu Province (No. 1506RJZA068).

Supplementary material

10311_2019_932_MOESM1_ESM.docx (1.1 mb)
Supplementary file1 (DOCX 1098 kb)


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringLanzhou Jiaotong UniversityLanzhouChina

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