Tsai Chi-Hung, Tsai Wen-Tien, Kuo Li-An
Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Graduate Institute of Bioresources, National Pingtung University of Science and Technology, Pingtung 912, Taiwan.
Materials (Basel). 2023 Dec 6;16(24):7529. doi: 10.3390/ma16247529.
Porous carbon materials have been widely used to remove pollutants from the liquid-phase streams. However, their limited pore properties could be a major problem. In this work, the effects of post-washing methods (i.e., water washing and acid washing) on the textural characteristics of the resulting biochar and activated carbon products from pineapple peel biomass were investigated in the carbonization and CO activation processes. The experiments were set at an elevated temperature (i.e., 800 °C) holding for 30 min. It was found that the enhancement in pore property reached about a 50% increase rate, increasing from 569.56 m/g for the crude activated carbon to the maximal BET surface area of 843.09 m/g for the resulting activated carbon by water washing. The resulting activated carbon materials featured the microporous structures but also were characteristic of the mesoporous solids. By contrast, the enhancement in the increase rate by about 150% was found in the resulting biochar products. However, there seemed to be no significant variations in pore property with post-washing methods. Using the energy dispersive X-ray spectroscopy (EDS) and the Fourier Transform infrared spectroscopy (FTIR) analyses, it showed some oxygen-containing functional groups or complexes, potentially posing the hydrophilic characters on the surface of the resulting carbon materials.
多孔碳材料已被广泛用于去除液相流中的污染物。然而，其有限的孔隙性质可能是一个主要问题。在这项工作中，研究了后处理方法（即水洗和酸洗）对菠萝皮生物质碳化和CO活化过程中所得生物炭和活性炭产品结构特性的影响。实验设定在高温（即800℃）下保持30分钟。结果发现，水洗使孔隙性质的增强率达到约50%的增加率，粗活性炭的比表面积从569.56 m²/g增加到所得活性炭的最大BET比表面积843.09 m²/g。所得活性炭材料具有微孔结构，但也是介孔固体的特征。相比之下，所得生物炭产品的增加率提高了约150%。然而，后处理方法对孔隙性质似乎没有显著影响。通过能量色散X射线光谱（EDS）和傅里叶变换红外光谱（FTIR）分析表明，所得碳材料表面存在一些含氧官能团或络合物，可能使其具有亲水性。
