N-doped porous biochar is a promising material for CO₂ capture due to its easy regeneration and high CO₂ selectivity. In this study, a new strategy was proposed to design monodisperse porous carbon spheres by microfluidics system with chitosan in-situ grow ZIF-8, utilizing ZIF-8 as a self-sacrificing template and nitrogen dopant. The mesoporous volume and N content of carbon spheres can be adjusted through the ZIF-8 content in the microfluidic system and carbonization temperature, within 0.01 ∼ 0.48 cm³/g and 3.23 ∼ 19.25%, respectively. The optimum sample (CZ₂-900) exhibited superior CO₂/N₂ selectivity at 40. Adsorption kinetics and diffusion resistance indicated that CO₂ adsorption in CZ₂-900 is controlled by the process of CO₂ diffusion from the surface of the basic site to mesopores. This was the first attempt at using a microfluid chip to grow ZIF-8 in chitosan skeleton and pyrolysis approach to synthesize N-doped porous carbon sphere where both additional template agent and activator are non-used, revealing the potential of microfluidic technology for the precise synthesis of highly selective CO₂ capture materials.

由于其易于再生和高 CO ₂选择性，N 掺杂多孔生物炭是一种很有前途的 CO ₂捕获材料。在这项研究中，提出了一种新的策略，利用 ZIF-8 作为自牺牲模板和氮掺杂剂，利用壳聚糖原位生长 ZIF-8 的微流体系统设计单分散多孔碳球。碳球的介孔体积和氮含量可以通过微流控系统中的 ZIF-8 含量和碳化温度进行调节，分别在 0.01 ∼ 0.48 cm ³ /g 和 3.23 ∼ 19.25% 之间。最佳样品 (CZ ₂ -900) 表现出优异的 CO ₂ /N ₂选择性为40。吸附动力学和扩散阻力表明，CO _{2在CZ 2} -900中的吸附受控于CO ₂从碱性位点表面向中孔扩散的过程。这是首次尝试使用微流控芯片在壳聚糖骨架中生长 ZIF-8，并通过热解法合成 N 掺杂多孔碳球，其中不使用额外的模板剂和活化剂，揭示了微流控技术在精确高选择性CO ₂捕集材料的合成。