This work is scrutinizing the development of metallized biochar as a low-cost bio-sorbent for low temperature CO2 capture with high adsorption capacity. Accordingly, single-step pyrolysis process was carried out in order to synthesize biochar from rambutan peel (RP) at different temperatures. The biochar product was then subjected to wet impregnation with several magnesium salts including magnesium nitrate, magnesium sulphate, magnesium chloride and magnesium acetate which then subsequently heat-treated with N2. The impregnation of magnesium into the biochar structure improved the CO2 capture performance in the sequence of magnesium nitrate > magnesium sulphate > magnesium chloride > magnesium acetate. There is an enhancement in CO2 adsorption capacity of metallized biochar (76.80 mg g-1) compare with pristine biochar (68.74 mg g-1). It can be justified by the synergetic influences of physicochemical characteristics. Gas selectivity study verified the high affinity of biochar for CO2 capture compared with other gases such as air, methane, and nitrogen. This investigation also revealed a stable performance of the metallized biochar in 25 cycles of CO2 adsorption and desorption. Avrami kinetic model accurately predicted the dynamic CO2 adsorption performance for pristine and metallized biochar.

中文翻译：

---

增强金属结合改性生物炭吸附剂对CO2的吸附。

这项工作正在仔细研究金属化生物炭的开发，该生物炭是一种低成本生物吸附剂，可用于具有高吸附能力的低温CO2捕集。因此，为了在不同温度下由红毛丹皮（RP）合成生物炭，进行了一步热解工艺。然后将生物炭产物用几种镁盐进行湿浸渍，包括硝酸镁，硫酸镁，氯化镁和乙酸镁，然后将其用N 2热处理。镁在生物炭结构中的浸入按照硝酸镁>硫酸镁>氯化镁>乙酸镁的顺序改善了CO2的捕集性能。与原始生物炭（68.74 mg g-1）相比，金属化生物炭（76.80 mg g-1）的CO2吸附能力增强。可以通过理化特性的协同影响来证明这一点。气体选择性研究证明了与其他气体（如空气，甲烷和氮气）相比，生物炭对二氧化碳捕获的亲和力高。该研究还揭示了金属化生物炭在25个CO2吸附和解吸循环中具有稳定的性能。Avrami动力学模型可以准确预测原始和金属化生物炭的动态CO2吸附性能。