School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China.
School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, 510006, Guangzhou, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), 510006, Guangzhou, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, 510006, Guangzhou, China.
Environ Pollut. 2023 Apr 1;322:121134. doi: 10.1016/j.envpol.2023.121134. Epub 2023 Jan 28.
Pore distribution characteristic is one of the most crucial factors for porous adsorption materials, and the variety of volatile organic compounds (VOCs) approaches about how to simply and accurately tailor practical porous carbons for VOCs adsorption has gradually attracted attention. Here, precursors with different lignocellulose mass ratios have been used to produce porous carbon for model experiments to investigate the influence of the precursor lignocellulose contents on the pore structure and distribution characteristics of porous carbon, and the applicability of these mechanisms to real biomass materials has been further verified through bacteria-targeted bagasse decomposition: the microvolumes of ultra-micropores have decreased with decrease in cellulose contents, while mesopores have followed the reverse trend. The dynamic toluene adsorption/desorption performances of the obtained samples have been tested. The BACs-36 exhibits high toluene adsorption performance in low concentration with 635 mg/g while the BACs-48 shows excellent reusability in 10 times cycles. Based on this the balance between the adsorptive and regenerative capacities has been observed which indicates that carbon materials with abundant micropores and narrow mesopores have much better adsorption performance than porous carbon with a hierarchical pore structure, while the latter show better regeneration abilities than the former, which resulting in less desorption as a counter-acting force at the pore wall. Furthermore, the porous carbon has been shaped by one-step co-pyrolysis method using phenolic resin, which can not only maintain the hardness but also can avoid pore plugging phenomenon.
孔分布特征是多孔吸附材料最重要的因素之一，而挥发性有机化合物（VOCs）的种类则使得如何简单、准确地为 VOCs 吸附定制实用多孔碳逐渐受到关注。在这里，使用具有不同木质纤维素质量比的前体来制备多孔碳进行模型实验，以研究前体木质纤维素含量对多孔碳的孔结构和分布特征的影响，并通过针对细菌的蔗渣分解进一步验证这些机制对实际生物质材料的适用性：微孔中的微体积随着纤维素含量的降低而降低，而介孔则呈现相反的趋势。对所得样品的动态甲苯吸附/解吸性能进行了测试。BACs-36 在低浓度下具有 635mg/g 的高甲苯吸附性能，而 BACs-48 在 10 次循环中表现出优异的可重复使用性。基于此，观察到了吸附和再生能力之间的平衡，这表明具有丰富微孔和窄介孔的碳材料比具有分级孔结构的多孔碳具有更好的吸附性能，而后者比前者具有更好的再生能力，从而在孔壁上产生较小的解吸作为反作用力。此外，还使用一步共热解方法使用酚醛树脂对多孔碳进行成型，这不仅可以保持硬度，还可以避免孔堵塞现象。
