Wijitkosum Saowanee, Sriburi Thavivongse
Environmental Research Institute, Chulalongkorn University, Bangkok, 10330, Thailand.
Pa-deng Biochar Research Center, Phetchaburi, 76170, Thailand.
Heliyon. 2023 Sep 5;9(9):e19831. doi: 10.1016/j.heliyon.2023.e19831. eCollection 2023 Sep.
Transforming disposable bamboo chopstick (DBC) wastes into biochar is an effective way to achieve waste-to-resource conversion. This research focused on the elemental and chemical composition of biochar and revealed how these properties affect biochar performance in real-world applications, particularly with respect to climate change mitigation. This research is aimed at examining the effect of pyrolysis temperature on the aromaticity, polarity, and longevity of DBC biochar. The DBC feedstock was pyrolyzed at different temperatures of 400 °C, 450 °C, 500 °C, and 550 °C with a holding time of 20 min at a constant heating rate of 20 °C min. The chemical composition, including carbon (C), hydrogen (H), nitrogen (N), oxygen (O), volatile matter (VM), ash, and fixed carbon (FC) contents, were analyzed. The aromaticity, polarity, and longevity of biochar are presented by the atomic ratios of H/C, O/C, (O + N)/C, and C/N, and these ratios are used to determine the potential of biochar for use in climate change mitigation applications. The findings demonstrated that DBC biochar produced at various pyrolysis temperatures contained C contents ranging from 77.54% to 88.06%, ash contents ranging from 2.62% to 2.99%, and a half-life of over 1000 years (O/C < 0.2). Pyrolysis temperature significantly affected biochar properties, as supported by the results for the FC/ash ratio (>10); the ash, FC, C, and N contents increased with increasing temperature; in contrast, the VM, H, and O contents decreased. The results revealed that DBC wastes are the potential feedstock to produce good-quality biochar that could be applied for environmental purposes. Furthermore, the research demonstrated that the best-performing DBC biochar was produced at 500 °C, which had the highest C content, aromaticity, and longevity and the lowest polarity as represented by the values of O/C, H/C, and (O + N)/C, and this biochar could be applied for climate change mitigation purposes.
将一次性竹筷废弃物转化为生物炭是实现废物资源化的有效途径。本研究聚焦于生物炭的元素和化学组成，并揭示了这些特性如何影响生物炭在实际应用中的性能，特别是在缓解气候变化方面。本研究旨在考察热解温度对一次性竹筷生物炭的芳香性、极性和稳定性的影响。将一次性竹筷原料在400℃、450℃、500℃和550℃的不同温度下进行热解，在20℃/min的恒定加热速率下保持20分钟。分析了其化学组成，包括碳（C）、氢（H）、氮（N）、氧（O）、挥发物（VM）、灰分和固定碳（FC）含量。生物炭的芳香性、极性和稳定性通过H/C、O/C、(O + N)/C和C/N的原子比来表示，这些比值用于确定生物炭在缓解气候变化应用中的潜力。研究结果表明，在不同热解温度下产生的一次性竹筷生物炭的C含量在77.54%至88.06%之间，灰分含量在2.62%至2.99%之间，半衰期超过1000年（O/C < 0.2）。热解温度显著影响生物炭的性能，FC/灰分比（>10）的结果支持了这一点；灰分、FC、C和N含量随温度升高而增加；相反，VM、H和O含量降低。结果表明，一次性竹筷废弃物是生产可用于环境目的的优质生物炭的潜在原料。此外，研究表明，性能最佳的一次性竹筷生物炭是在500℃下产生的，其C含量、芳香性和稳定性最高，以O/C、H/C和(O + N)/C值表示的极性最低，可以用于缓解气候变化的目的。
