Mechanism of Cr(VI) removal by polyphenols-rich bacterial cellulose gel produced from fermented wine pomace

Hexavalent chromium (Cr(VI)) is still a common contaminant in water. In this work, we studied the Cr(VI) adsorption by polyphenol-rich bacterial cellulose(BC) gel, synthesized by the Komagataeibacter rhaeticus K15 using wine pomace. The results showed that the equilibrium removal capacity was 473.09...

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Bibliographic Details
Published innpj clean water Vol. 7; no. 1; pp. 21 - 11
Main Authors Li, Zhi-yu, Dong, Jia-jia, Azi, Fidelis, Feng, Xue, Ge, Zhi-wen, Yang, Sha, Sun, Yu-xia, Guan, Xue-qiang, Dong, Ming-sheng
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 20.03.2024
Nature Publishing Group
Nature Portfolio
Subjects
704/172/169/896
704/47
Adsorption
Aquatic Pollution
Cellulose
Chemical reduction
Chromium
Contaminants
Earth and Environmental Science
Efficiency
Environment
Heavy metals
Hexavalent chromium
Nanotechnology
Polyphenols
Sulfuric acid
Trivalent chromium
Waste Water Technology
Wastewater purification
Water Industry/Water Technologies
Water Management
Water pollution
Water Pollution Control
Water purification
Water Quality/Water Pollution
Water treatment
Wine
Wines
X ray photoelectron spectroscopy
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Summary:Hexavalent chromium (Cr(VI)) is still a common contaminant in water. In this work, we studied the Cr(VI) adsorption by polyphenol-rich bacterial cellulose(BC) gel, synthesized by the Komagataeibacter rhaeticus K15 using wine pomace. The results showed that the equilibrium removal capacity was 473.09 ± 1.41 mg g −1 (dry weight). The quasi-second-order kinetics model and the Langmuir removal isotherm model was the most suitable for describing the Cr(VI) removal process. Toxic Cr(VI) was converted to the low toxic Cr(III) during the removal process via the reduction of Cr(VI) to Cr(III) by polyphenols released into the solution by the BC gel. The FTIR, XRD, XPS, SEM-EDX results indicated the physical adsorption on the surface of BC and the reduction reaction between polyphenol groups and Cr(VI) is the critical mechanism of Cr(VI) removal by BC. The finding of this study demonstrates that polyphenols-rich BC gel produced from wine pomace has a superior feature for future Cr(VI)-wastewater purification.
ISSN:2059-7037
2059-7037
DOI:10.1038/s41545-024-00318-5