Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 145, Issue -, Pages 1049-1058Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.09.197
Keywords
Pullulan; Polydopamine; Hydrogels; Adsorbents; Heavy metal ions
Funding
- National Natural Science Foundation of China [31800833, 51874128, 51874129]
- Zhejiang Provincial Natural Science of Foundation of China [Z19H180001]
- Wenzhou Medical University [89218028]
- Wenzhou Institute of Biomaterials Engineering [WIBEZD2017001-03]
- Wenzhou Science and Technology Plan Project [Y20180071]
- Start-up Scientific Research Foundation of Wenzhou Medical University [KYQD20190513]
- scientific research fund of National Health and Family Planning Commission [wkj-zj-1707]
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Designing a new adsorbent with recyclability, high efficiency and biodegradability is important for treating heavy metals contamination but remains a severe challenge. In this work, a novel type of hydrogel biosorbents based on pullulan and polydopamine were designed for heavy metal ions removal from aqueous solution. The physicochemical properties of the prepared pullulan/polydopamine (Pu/PDA) hydrogels were fully characterized by thermal gravimetric analysis, Fourier transform infrared spectroscopy, rheology, scanning electron microscopy, swelling and compression tests. We observed that their mechanical strength, pore size, water absorption and retention properties could be nicely controlled by adjusting the PDA concentration in the pre-gel solution. Subsequently, the adsorption ability of designed Pu/PDA hydrogels to Cu2+, Co2+ and Ni2+ was investigated in detail. These hydrogels presented excellent adsorption capability for heavy metal ions and matched well with the pseudo-second-order kinetic model and Freundlich isotherm model. Overall, having tunable physicochemical properties coupled with the high absorption ability for heavy metal ions, these Pu/PDA hydrogels may be a promising strategy for removal of pollutants from aqueous solution. (C) 2019 Elsevier B.V. All rights reserved.
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