School of Water and Environment, Chang'an University, Xi'an, 710054, China.
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Xi'an, 710054, China.
Environ Sci Pollut Res Int. 2022 Oct;29(49):74306-74318. doi: 10.1007/s11356-022-20045-z. Epub 2022 May 30.
Porous carbon is an excellent absorbent for pollutants in water. Here, we report a breakthrough in performance of porous carbon based on lignin prepared using sodium lignosulfonate (SLS), potassium carbonate and melamine as precursor, activator and nitrogen source, respectively. A series of characterization tests confirmed that in-situ nitrogen doping greatly enhanced porous structure, resulting in a specific surface area of 2567.9 m g and total pore volume of 1.499 cm g, which is nearly twice that of non-nitrogen-doped porous carbon. Moreover, adsorption experiments revealed that at 303 K, the saturated adsorption capacity of chloramphenicol was as high as 713.7 mg g, corresponding to an improvement of 33.7%. Further, the prepared porous carbon exhibited a strong anti-interference against metal ions and humic acid. The adsorption process was confirmed to be an endothermic reaction dominated by physical adsorption, indicating that an increase in temperature is conducive to adsorption. The results of this study show that nitrogen-doped lignin-based porous carbon prepared by in-situ doping is a promising material to significantly alleviate water pollution owing to its low cost, excellent pore structure and good adsorption properties.
多孔碳是一种优秀的水中污染物吸附剂。在这里，我们报告了一种基于木质素的多孔碳的突破性进展，木质素是使用木质素磺酸钠（SLS）、碳酸钾和三聚氰胺分别作为前体、活化剂和氮源制备的。一系列特征测试证实，原位氮掺杂极大地增强了多孔结构，比表面积达到 2567.9 m²/g，总孔体积达到 1.499 cm³/g，几乎是未掺杂氮的多孔碳的两倍。此外，吸附实验表明，在 303 K 时，氯霉素的饱和吸附容量高达 713.7 mg/g，提高了 33.7%。此外，所制备的多孔碳对金属离子和腐殖酸具有很强的抗干扰能力。吸附过程被确认为是一种由物理吸附主导的吸热反应，这表明温度升高有利于吸附。这项研究的结果表明，由于其成本低、孔隙结构优良和吸附性能好，通过原位掺杂制备的氮掺杂木质素基多孔碳是一种很有前途的材料，可以显著缓解水污染。
