Wang Qiongyao, Sun Yongchang, Hao Mingge, Yu Fangxin, He Juanni
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Water and Environment, Chang'an University, Xi'an 710054, China.
Huijin Technology Holding Group Corporation Limited, Xi'an 710000, China.
Molecules. 2023 Jul 31;28(15):5789. doi: 10.3390/molecules28155789.
Aminated lignin (AL) was obtained by modifying technical lignin (TL) with the Mannich reaction, and aminated lignin-based titanate nanotubes (AL-TiNTs) were successfully prepared based on the AL by a facile hydrothermal synthesis method. The characterization of AL-TiNTs showed that a Ti-O bond was introduced into the AL, and the layered and nanotubular structure was formed in the fabrication of the nanotubes. Results showed that the specific surface area increased significantly from 5.9 m/g (TL) to 188.51 m/g (AL-TiNTs), indicating the successful modification of TL. The AL-TiNTs quickly adsorbed 86.22% of Cr(VI) in 10 min, with 99.80% removal efficiency after equilibration. Under visible light, AL-TiNTs adsorbed and reduced Cr(VI) in one step, the Cr(III) production rate was 29.76%, and the amount of total chromium (Cr) removal by AL-TiNTs was 90.0 mg/g. AL-TiNTs showed excellent adsorption capacities of Zn (63.78 mg/g), Cd (59.20 mg/g), and Cu (66.35 mg/g). After four cycles, the adsorption capacity of AL-TiNTs still exceeded 40 mg/g. AL-TiNTs showed a high Cr(VI) removal efficiency of 95.86% in simulated wastewater, suggesting a promising practical application in heavy metal removal from wastewater.
通过曼尼希反应对工业木质素（TL）进行改性获得胺化木质素（AL），并基于AL通过简便的水热合成方法成功制备了胺化木质素基钛酸纳米管（AL-TiNTs）。对AL-TiNTs的表征表明，在AL中引入了Ti-O键，并且在纳米管的制备过程中形成了层状和纳米管状结构。结果表明，比表面积从5.9 m²/g（TL）显著增加到188.51 m²/g（AL-TiNTs），表明TL改性成功。AL-TiNTs在10分钟内迅速吸附了86.22%的Cr(VI)，平衡后去除效率达到99.80%。在可见光下，AL-TiNTs一步吸附并还原Cr(VI)，Cr(III)生成率为29.76%，AL-TiNTs去除总铬（Cr）的量为90.0 mg/g。AL-TiNTs对Zn（63.78 mg/g）、Cd（59.20 mg/g）和Cu（66.35 mg/g）表现出优异的吸附能力。经过四个循环后，AL-TiNTs的吸附容量仍超过40 mg/g。AL-TiNTs在模拟废水中对Cr(VI)的去除效率高达95.86%，表明其在废水中重金属去除方面具有广阔的实际应用前景。
