College of Science, Central South University of Forestry and Technology, Changsha 410004, China; College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
College of Science, Central South University of Forestry and Technology, Changsha 410004, China.
Int J Biol Macromol. 2022 Aug 31;215:625-634. doi: 10.1016/j.ijbiomac.2022.06.148. Epub 2022 Jun 27.
Chromium pollution is a major environmental concern; thus, effective and multifunctional adsorbents for removing the Cr(VI) ion are urgently needed. A fluorescent nanocellulose-based hydrogel (FNH) incorporating titanate nanofibers (TNs) was developed for the sorption and detection of Cr(VI) ion. The chemical and physical structures of the hydrogels, as well as their sorption and detection properties, were studied. The predicted maximum adsorption capacity and the lowest detection limit of FNH were 648.4 mg/g and 0.039 μg/L, respectively. Furthermore, the sorption and detection mechanisms of FNH were discussed in detail. These results showed that the excellent sorption and detection might be mainly attributed to the three-dimensional (3D) porous structure constructed by TNs and cellulose nanocrystals modified with carbon dots, which improved the sorption ability and provided the rapid visual response to Cr(VI). Furthermore, cost analysis showed that FNH was cheaper than activated carbon in removing the Cr(VI) ion. This work established a facile technique in developing low-cost and multifunctional adsorbents.
铬污染是一个主要的环境问题；因此，迫切需要开发用于去除六价铬离子的有效且多功能的吸附剂。本研究制备了一种基于荧光纳米纤维素的水凝胶（FNH），其中掺入了钛酸盐纳米纤维（TNs），用于六价铬离子的吸附和检测。研究了水凝胶的化学和物理结构及其吸附和检测性能。FNH 的预测最大吸附容量和最低检测限分别为 648.4mg/g 和 0.039μg/L。此外，详细讨论了 FNH 的吸附和检测机制。结果表明，优异的吸附和检测性能主要归因于 TNs 和用碳点修饰的纤维素纳米晶体构建的三维（3D）多孔结构，这提高了吸附能力，并为快速视觉响应 Cr(VI)提供了可能性。此外，成本分析表明，FNH 去除六价铬离子比活性炭更便宜。这项工作为开发低成本多功能吸附剂建立了一种简便的技术。
