Chen Xiaojing, Jin Xiaobing, Zhang Chi, Jiao Zile, Yang Zhiping, Wang Ke, Li Jianhua, Zhang Qiang
Institute of Eco-Environmental Industry Technology, College of Resources and Environment, Shanxi Agricultural University, Taiyuan 030031, China.
Soil Health Laboratory in Shanxi Province, Taiyuan 030031, China.
Molecules. 2024 Nov 26;29(23):5589. doi: 10.3390/molecules29235589.
The development of widely sourced and efficient adsorbents is crucial for the adsorption of lead from wastewater. A novel adsorbent, N-doped weathered coal (NWC), was prepared in this study using weathered coal as the precursor and triethylenetetramine (TETA) as the N-source. The adsorption performance and behavior of Pb(II) on NWC were investigated using batch adsorption experiments. The results demonstrated that NWC has an efficient adsorption performance towards Pb(II), with a maximum monolayer adsorption capacity of 216.32 mg g (25 °C). The adsorption process was spontaneous and endothermic, and the importance of chemisorption was observed. The adsorption mechanisms of NWC were also analyzed based on its physicochemical structure before and after the Pb(II) adsorption and desorption experiments. The N and O functional groups, acting as electron donors, promoted coordination with Pb(II), making complexation the dominant mechanism. Its contribution to the adsorption mechanism could reach 44.81%. NWC is a promising material for both wastewater treatment and the resource utilization of weathered coal.
开发来源广泛且高效的吸附剂对于从废水中吸附铅至关重要。本研究以风化煤为前驱体、三乙烯四胺（TETA）为氮源，制备了一种新型吸附剂——氮掺杂风化煤（NWC）。采用批量吸附实验研究了Pb(II)在NWC上的吸附性能和行为。结果表明，NWC对Pb(II)具有高效的吸附性能，在25℃下最大单层吸附容量为216.32 mg g 。吸附过程是自发且吸热的，观察到化学吸附的重要性。还基于Pb(II)吸附和解吸实验前后NWC的物理化学结构分析了其吸附机理。作为电子供体的N和O官能团促进了与Pb(II)的配位，使络合成为主导机制。其对吸附机理的贡献可达44.81%。NWC是一种在废水处理和风化煤资源利用方面都很有前景的材料。
