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.

六价铬 (Cr(VI)) 仍然是水中常见的污染物。在这项工作中，我们研究了富含多酚的细菌纤维素 (BC) 凝胶对 Cr(VI) 的吸附，该凝胶是由 Komagataeibacter rhaeticus K15 使用酒渣合成的。结果表明，平衡去除能力为473.09 ± 1.41 mg g ^-1（干重）。准二级动力学模型和Langmuir去除等温线模型最适合描述Cr(VI)去除过程。在去除过程中，BC 凝胶释放到溶液中的多酚将 Cr(VI) 还原为 Cr(III)，有毒 Cr(VI) 转化为低毒 Cr(III)。 FTIR、XRD、XPS、SEM-EDX结果表明BC表面的物理吸附以及多酚基团与Cr(VI)之间的还原反应是BC去除Cr(VI)的关键机制。本研究的结果表明，由酒渣生产的富含多酚的BC凝胶对于未来Cr(VI)废水净化具有优越的特性。