Zhao Jiaxin, Yang Cong, He Jiang, Liu Li, Yao Jinzhong, Yang Yaohong, Xu Kaimeng, Feng Wenxuan, Du Guanben, Zhang Lianpeng
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
Int J Biol Macromol. 2025 Apr;300:140243. doi: 10.1016/j.ijbiomac.2025.140243. Epub 2025 Jan 23.
Cellulose composites have exceptional qualities, particularly in removing heavy metal ions. Nevertheless, these materials' poor mechanical qualities and the restricted exposure of surface-active sites reduce the effectiveness of their removal. The removal efficiency of adsorbent materials largely depends on their macroscopic structural characteristics. This study successfully developed a novel cellulose composite aerogel adsorbent (TBPM). TBPM aerogel possesses not only numerous active sites but also excellent mechanical strength. It is particularly suitable for the efficient removal of hexavalent chromium (Cr(VI))-containing wastewater. The aerogel exhibited a low density of 0.0238 g/cm and high porosity of 98.51 %. Incorporating the covalent organic framework (BT-Dg) increased the active sites in the composite aerogel, enhancing its adsorption performance. Compared with other common heavy metal ion adsorbents, the TBPM aerogel demonstrated superior removal performance, with a maximum adsorption capacity of 411.12 mg/g and a removal efficiency of 95.01 % in Cr(VI) solution at 15 °C, pH = 3. The adsorption of Cr(VI) followed pseudo-second-order kinetics and the Langmuir isotherm model. Even after seven adsorption-desorption cycles, TBPM aerogel maintained over 80 % removal efficiency. In addition, the TBPM aerogel successfully filtered 3439 mL of Cr(VI)-containing wastewater. This composite aerogel expands the application of cellulose composites in purifying wastewater.
纤维素复合材料具有卓越的品质，尤其是在去除重金属离子方面。然而，这些材料较差的机械性能以及表面活性位点的有限暴露降低了它们的去除效果。吸附剂材料的去除效率在很大程度上取决于其宏观结构特征。本研究成功开发了一种新型纤维素复合气凝胶吸附剂（TBPM）。TBPM气凝胶不仅拥有众多活性位点，还具有出色的机械强度。它特别适用于高效去除含六价铬（Cr(VI)）的废水。该气凝胶的密度低至0.0238 g/cm，孔隙率高达98.51%。引入共价有机框架（BT-Dg）增加了复合气凝胶中的活性位点，提高了其吸附性能。与其他常见的重金属离子吸附剂相比，TBPM气凝胶表现出卓越的去除性能，在15°C、pH = 3的Cr(VI)溶液中，最大吸附容量为411.12 mg/g，去除效率为95.01%。Cr(VI)的吸附遵循准二级动力学和朗缪尔等温线模型。即使经过七次吸附-解吸循环，TBPM气凝胶仍保持超过80%的去除效率。此外，TBPM气凝胶成功过滤了3439 mL含Cr(VI)的废水。这种复合气凝胶拓展了纤维素复合材料在净化废水方面的应用。
