Li Xueyan, Bi Changlong, Wang Yuanfei, Peng Chong, Li Yun, Yang Shuyi, Tao E
Liaoning Key Laboratory for Chemical Clean Production, Liaoning Key Laboratory for Surface Functionalization of Titanium Dioxide Powder, Institute of Ocean Research, Institute Environmental Research, College of Chemistry and Material Engineering, Bohai University, Jinzhou 121013, Liaoning, China.
Liaoning Huadian Environmental Testing Co., LTD, Jinzhou 121013, Liaoning, China.
Int J Biol Macromol. 2025 May;305(Pt 2):141240. doi: 10.1016/j.ijbiomac.2025.141240. Epub 2025 Feb 17.
To address the pH limitations of traditional Cr(VI) adsorbents, converting Cr(VI) anions into the more stable Cr(III) cations through a reduction reaction is an effective strategy. Therefore, in this study, gallic acid (GA), with a high redox potential, was selected as the reducing agent, together with chitosan (CS) as the substrate, and sodium alginate (SA) as the gelling agent. A novel SCG composite material was successfully prepared using the sol-gel crosslinking method, which efficiently captured and reduced Cr(VI) while immobilizing Cr(III). At pH = 4, t = 150 min, and T = 30 °C, 1 g/L of SCG can remove 94.7 % of Cr(VI), with a reduction rate of 67.5 %, achieving efficient and stable Cr(VI) removal over a wide pH range. Furthermore, the SCG material demonstrated good pH adaptability (It can still remove 84 % of Cr(VI) at pH = 7) and practical applicability. Comparative experiments and DFT calculation results showed that the introduction of GA not only helped form a more compact network structure but also interacted synergistically with CS, significantly promoting the removal of Cr(VI). In conclusion, the SCG composite material provides a new approach for the treatment of Cr(VI)-contaminated wastewater.
为了解决传统六价铬吸附剂的pH值限制问题，通过还原反应将六价铬阴离子转化为更稳定的三价铬阳离子是一种有效的策略。因此，在本研究中，选择具有高氧化还原电位的没食子酸（GA）作为还原剂，壳聚糖（CS）作为底物，海藻酸钠（SA）作为胶凝剂。采用溶胶-凝胶交联法成功制备了一种新型SCG复合材料，该材料能有效捕获和还原六价铬，同时固定三价铬。在pH = 4、t = 150分钟和T = 30°C条件下，1 g/L的SCG能去除94.7%的六价铬，还原率为67.5%，在较宽的pH范围内实现了高效稳定的六价铬去除。此外，SCG材料表现出良好的pH适应性（在pH = 7时仍能去除84%的六价铬）和实际应用适用性。对比实验和DFT计算结果表明，GA的引入不仅有助于形成更致密的网络结构，还与CS协同作用，显著促进了六价铬的去除。总之，SCG复合材料为处理六价铬污染废水提供了一种新方法。
