School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China; College of Science, Northeast Agticultural University, Harbin 150030, China.
School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
Sci Total Environ. 2017 Dec 31;607-608:1391-1399. doi: 10.1016/j.scitotenv.2017.07.020. Epub 2017 Jul 19.
N-doped porous carbon sheets (NPCS) resulted from wheat straws are fabricated through using molten salts via the carbonization-functionalization progress, which show unique hierarchical structure, large pore volume and high surface area with affluent micropores. Results indicate that there exist many hierarchical pores consisting of the single carbon sheet with ultrathin nature, owing to the template role of molten salt mixtures at high temperature. Such superior structure can bring about desired performance of adsorption capacity of 82.8mg/g and quick adsorption rate of 1.43L/(gh) with an initial concentration of 35mg/L at 25°C. Langmuir and Freundlich models are adopted to interpret the adsorption behavior of atrazine and modified Freundlich and intraparticle diffusion (IPD) models are employed to characterize the dynamics of adsorption. Furthermore, nitrogen-functionalization biochars via molten salt synthesis should be further developed as a one-pot methodology to produce N-doped carbons, opening up a feasible approach for resource utilization of crop straws and other biomass wastes.
通过熔融盐碳化-功能化过程，从麦秆制备出氮掺杂多孔碳片（NPCS），其具有独特的分级结构、大孔体积和高比表面积，以及丰富的微孔。结果表明，由于高温下熔融盐混合物的模板作用，存在许多由超薄单碳片组成的分级孔。这种优异的结构可以带来 82.8mg/g 的期望吸附容量和 35mg/L 初始浓度下 25°C 时 1.43L/(gh) 的快速吸附速率。采用 Langmuir 和 Freundlich 模型来解释莠去津的吸附行为，采用修正 Freundlich 和内扩散（IPD）模型来描述吸附动力学。此外，通过熔融盐合成进行氮功能化生物炭应该作为一种一锅法进一步发展，以生产氮掺杂碳，为农作物秸秆和其他生物质废物的资源利用开辟了可行的途径。
