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Evaluation of biochar derived from the slow pyrolysis of rice straw as a potential adsorbent for carbon dioxide
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2021-07-11 , DOI: 10.1007/s13399-021-01719-z
Chasin Krishna C. Cabriga 1 , Kerstein Vince B. Clarete 1 , Joyce Ann T. Zhang 1 , Rose Mardie P. Pacia 1 , Jhulimar C. Castro 1, 2 , Young Soo Ko 3
Affiliation  

The CO2 adsorption capacity of biochar derived from the slow pyrolysis of rice straw and the influence of surface modification via amine impregnation on the biochar were evaluated in this study. The biochar’s (BC) surface characteristics, selectivity, adsorption capacity, and regenerability were compared to that of a commercial activated carbon (CAC). It was observed that the surface chemistry of the biochar greatly affects its ability to adsorb CO2. Tetraethylenepentamine (TEPA) was used to functionalize the surface of the samples. Under the scanning electron microscope (SEM), the BC sample was porous; however, modifying it caused some blockage in the sample. On the other hand, the CAC sample exhibited very fine particles while its modification showed no obvious qualitative change under the SEM. All the samples, both pure and modified BC and CAC, were identified to be selective to CO2. CAC gained the highest CO2 adsorption capacity of 9 wt%, followed by TEPA-50/CAC (5.7 wt%), BC (2.6 wt%), and TEPA-50/BC (2.4 wt%), under pure CO2 gas condition. Interestingly, under CO2-N2 gas mixture, the adsorption capacity of rice straw biochar is comparable to that of the commercial activated carbon. The biochar from rice straw can be an economic solid adsorbent for CO2 with further improvements.



中文翻译:

稻草缓慢热解产生的生物炭作为二氧化碳潜在吸附剂的评价

本研究评估了源自稻草缓慢热解的生物炭的 CO 2吸附能力以及通过胺浸渍进行的表面改性对生物炭的影响。将生物炭 (BC) 的表面特性、选择性、吸附能力和可再生性与商业活性炭 (CAC) 进行了比较。据观察,生物炭的表面化学极大地影响其吸附 CO 2 的能力. 四亚乙基五胺 (TEPA) 用于对样品表面进行功能化。在扫描电子显微镜(SEM)下,BC 样品是多孔的;但是,修改它会导致样本中出现一些阻塞。另一方面,CAC 样品表现出非常细小的颗粒,而其改性体在 SEM 下没有表现出明显的质变。所有样品,包括纯的和改性的 BC 和 CAC,都被鉴定为对 CO 2具有选择性。在纯 CO 2气体下,CAC 获得了最高的 CO 2吸附容量,为 9 wt%,其次是 TEPA-50/CAC (5.7 wt%)、BC (2.6 wt%) 和 TEPA-50/BC (2.4 wt%)状况。有趣的是,在 CO 2 -N 2气体混合物,稻草生物炭的吸附能力与商业活性炭的吸附能力相当。稻草生物炭可以成为经济的 CO 2固体吸附剂,并有进一步的改进。

更新日期:2021-07-12
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