Chitosan@TiO2 composites for the adsorption of copper(II) and antibacterial applications
Chitosan (CS) is a biopolymer that is well known for its ubiquity, biodegradability, lack of toxicity, low cost, antibacterial activity, and excellent heavy metal adsorption ability. We synthesized CS and CS@TiO 2 composites (CST) with different concentrations of glutaraldehyde (crosslinking agent)...
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Veröffentlicht in: | Sustainable environment research 2022-05, Vol.32 (1), p.1-15, Article 27 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Chitosan (CS) is a biopolymer that is well known for its ubiquity, biodegradability, lack of toxicity, low cost, antibacterial activity, and excellent heavy metal adsorption ability. We synthesized CS and CS@TiO
2
composites (CST) with different concentrations of glutaraldehyde (crosslinking agent) solution by a simple method involving a crosslinking process (using glutaraldehyde as the crosslinking agent), a freeze-drying technique, and exchange with ammonia solution. The interaction mechanisms of the as-synthesized samples were systematically characterized by scanning electron microscopy, electron dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and the Brunauer-Emmett-Teller method. Among the as-synthesized samples, 3%CS-V (CS composites synthesized using 3% glutaraldehyde for crosslinking and exchanged with ammonia solution) at an initial concentration of 300 ppm exhibited a preferable adsorption capacity for copper ions (Cu
2+
), with a maximum adsorption capacity of 31 mg g
− 1
. Sorption equilibrium isotherms fit the Freundlich model. Compared to CS, 7%CST-V (CST composite synthesized using 7% glutaraldehyde for crosslinking and exchanged with ammonia solution) exhibited higher antibacterial activity against
Staphylococcus epidermidis
due to a synergistic effect. The antimicrobial efficacy against
Escherichia coli
was more affected by copper ions than TiO
2
addition and glutaraldehyde concentration
,
whereas the antimicrobial efficacy against
S. epidermidis
was more affected by TiO
2
addition and exchange with ammonia solution
. |
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ISSN: | 2468-2039 2468-2039 |
DOI: | 10.1186/s42834-022-00138-7 |