A novel multi-functional and environmental friendly tannic acid polymer (Fe 3+ -TA-HCHO) with Fe 3+ and formaldehyde as double crosslinking agents together with cysteine as heteroatom source was prepared by a one-pot hydrothermal method. Characterization with transmission electron microscope (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FT-IR), and elemental analysis demonstrated that the Fe 3+ -TA-HCHO possessed uniform structure and particle size as well as plentiful functional groups. The resulted Fe 3+ -TA-HCHO material as a adsorbent to remove methylene blue, sunset yellow, Pb 2+ , Hg 2+ , and AsO 3 3− from water. The results suggested that Fe 3+ -TA-HCHO polymer (pHpzc is 2.33) showed different adsorption properties for anionic pollutants (sunset yellow and AsO 3 3− ) and cationic pollutants (methylene blue, Pb 2+ , and Hg 2+ ). The material exhibited remarkable selectivity for adsorption and separation of pollutants. The maximum adsorption capacities calculated from Langmuir model for methylene blue, Pb 2+ , and Hg 2+ were 154.32, 819.67, and 699.30 mg g −1 , respectively. This is the first time that tannic acid polymer is synthesized by double crosslinking method, which not only developed a promising adsorbent for selective removal of cation pollutants, but also opened up a new avenue for synthesis and application of tannic acid polymer.
Shuai Qiang Jiang,Su Ping Dai,Wei Ming Liu,Yin Wang,Zhao Yuan Li,Ya Wei Chen,Hyun Jin Park,Hui Yun Zhou
In this paper, three kinds of cyclodextrin-grafted-chitosan (CD-g-CS) were synthesized from chitosan (CS) and β-cyclodextrin (β-CD) with different ratios. And a series of hydrogel with good temperature sensitivity and injectability were prepared by using sodium glycerophosphate (GP) and ammonium hydrogen phosphate (AHP) as dual gelling agents. The gelation formation time of hydrogel was short, and the shortest time was 0.75 min. The FTIR spectrum and 1 H-NMR spectrum showed the structure of the compounds and intermolecular interactions. The molecular docking technique probed the encapsulation mechanism of the drug with β-CD. The SEM results showed that the hydrogel had a highly interconnected three-dimensional spatial structure. The swelling ratio of hydrogel was not less than 150 % within 1 h and the degradation rate of hydrogel was not less than 75 % within 14 days. The in vitro drug release results showed that the hydrogel had optimal sustained release effect, and the cumulative release ratio was 58.3 % in 34 h. The release kinetics analysis exhibited that the hydrogel conformed to the Riter-Peppas model. The hemocompatibility test and cytotoxicity test proved that the hydrogel had good biocompatibility and biosafety. The antibacterial experiments showed that the hydrogel could inhibit the biological activity of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Therefore, the CD-g-CS/GP-AHP hydrogel has a broad application prospect in the biological fields of drug delivery and antibacterial materials.
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