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Preparation and Properties of Polyacrylamide/Sodium Alginate Hydrogel and the Effect of Fe3+ Adsorption on Its Mechanical Performance

Zheng Cao1,2,3,4,*, Yang Zhang2, Keming Luo2, Yinqiu Wu2, Hongxin Gao2, Junfeng Cheng2,*, Chunlin Liu2,3, Guoliang Tao2, Qingbao Guan1, Lei Zhang5

1 Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, 201620, China
2 Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, China
3 Changzhou University Huaide College, Jingjiang, 214500, China
4 National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
5 Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

* Corresponding Authors: Zheng Cao. Email: ; Junfeng Cheng. Email:

(This article belongs to this Special Issue: Biomass-Derived Functional Hydrogels)

Journal of Renewable Materials 2021, 9(8), 1447-1462.


The preparation and application of functional hydrogels based on natural polysaccharides have always been a hot research topic. In this study, using acrylamide (AM) monomer, N, N'-methylene bisacrylamide (MBA) as cross-linking agent, potassium persulfate (K2S2O8) as initiator, in the presence of natural polysaccharide sodium alginate (SA), the PAM/SA hydrogel was prepared by free radical polymerization. Fourier transform infrared spectroscopy (FT-IR), swelling performance tests, scanning electron microscope (SEM), thermogravimetric analysis (TGA), UV-visible spectrophotometer, mechanical property measurements were carried out to analyze the composition, morphology, and performance of the hydrogels. The swelling behavior, dye adsorption performance, and the mechanical properties of PAM/SA hydrogels before and after Fe3+ adsorption were studied. The experimental results showed that the introduction of SA with 4.7%, 7.8%, and 10.3% effectively improved the mechanical and dye adsorption properties of PAM composite hydrogels. The adsorption capacity of PAM/4.7%SA and PAM/10.3%SA hydrogels at equilibrium can reach 40.01 and 44.02 mg/g for methylene blue, which is higher than the value 13.58 mg/g of pure PAM hydrogel. The compressive strength of pure PAM hydrogel is 0.124 MPa. When the SA content is 4.7%, 7.8%, and 10.3%, the compressive strength of the PAM/SA hydrogel was corresponding to 0.130 MPa, 0.134 MPa, and 0.152 MPa, respectively. Fe3+ was introduced into the PAM/SA hydrogels, and PAM/SA/Fe3+ double-network hydrogels with excellent mechanical properties could be prepared by adjusting the SA content (4.7%, 7.8%, and 10.3%), soaking time (1 h, 2 h, 3 h, 4 h, 5 h, 6 h), and Fe3+ concentration (4.76%, 7.41%, 9.09%, and 13.04%). Under the same Fe3+ concentration of 9.09% and adsorption time of 4 h, the compressive strengths of the PAM/4.7%SA, PAM/7.8%SA, and PAM/10.3%SA hydrogels could reach 0.354 MPa, 0.767 MPa, and 0.778 MPa, respectively.


Cite This Article

Cao, Z., Zhang, Y., Luo, K., Wu, Y., Gao, H. et al. (2021). Preparation and Properties of Polyacrylamide/Sodium Alginate Hydrogel and the Effect of Fe3+ Adsorption on Its Mechanical Performance. Journal of Renewable Materials, 9(8), 1447–1462.


This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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