The coconut shell-based activated carbon (AC) surface was effectively anchored with amine moieties with acid treatment followed by tetraethylenepentamine (TEPA) anchoring. The activated carbon surface enhanced with basicity is likely to increase the sorbent properties towards CO₂ adsorption. The AC surface was modified by varying TEPA concentrations. After amine doping, significant loss in textural property indicates their occupation inside the pores and surfaces. Further, the samples were thermally activated to retrieve the textural properties. The physicochemical properties of modified carbon were characterized using BET, TPD, FT-IR, Raman spectroscopy and elemental composition. The amine-modified and thermally activated carbons were tested for CO₂ adsorption up to 25 bar at 25 °C. The acid-base properties of N-doped carbons were evaluated using isopropanol as a model test reaction at atmospheric pressure. The IPA reaction products of acetone and propene were quantified for their acid-base nature and correlated to CO₂ adsorption capacities. The CO₂ adsorption capacity increases by tailoring synergistic properties between surface basicity and micropores. Hence, 20 % TEPA-derived nitrogen-enriched carbon reveals a higher yield of acetone 73 %, which in turn enhanced CO₂ adsorption capacity of 9.9 mmol/g, and it is found to be a suitable applicant for CO₂ capture.

中文翻译：

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高氮掺杂椰子壳活性炭的协同特性，用于高效捕获二氧化碳

椰壳基活性炭 (AC) 表面通过酸处理与胺部分有效锚定，然后用四亚乙基五胺 (TEPA) 锚定。碱性增强的活性炭表面可能会增加吸附剂对 CO ₂吸附的性能。AC 表面通过改变 TEPA 浓度进行了修饰。胺掺杂后，质地特性的显着损失表明它们占据了孔隙和表面。此外，样品被热激活以恢复纹理特性。使用BET、TPD、FT-IR、拉曼光谱和元素组成表征改性碳的理化性质。测试胺改性和热活性炭的 CO ₂在 25 °C 下吸附高达 25 bar。使用异丙醇作为在大气压下的模型测试反应来评估 N 掺杂碳的酸碱性质。丙酮和丙烯的 IPA 反应产物的酸碱性质被量化，并与 CO ₂吸附能力相关。CO ₂吸附能力通过调整表面碱度和微孔之间的协同特性而增加。因此，20 % TEPA 衍生的富氮碳显示出更高的丙酮收率 73 %，这反过来增强了 9.9 mmol/g 的CO ₂吸附能力，并且发现它是 CO ₂捕获的合适申请人。