In this study, the waste eggshell has been utilised to synthesise structure modified CaO using organic acids and employed for CO₂ capture in the thermogravimetric analysis (TGA) based systems. Different characterisation techniques were used such as XRD, SEM/EDS, XRF, N₂ sorption-desorption (BET) and TGA to investigate the suitability for CO₂ adsorption. The modified CaO using organic acids showed high surface area, easy upgradation of pore structure makes the CaO a suitable sorbent for CO₂ capturing as an economical sorbent. Three of the organic acid modified sorbent achieved the highest conversion and stability over a period of 20 cycles. Citric acid modified sorbent (CaO CA-10%) obtained a CO₂ uptake of 0.38 g CO₂/g sorbent (CaO conversion of 55%) that was highest among the acid used whereas in term of stability malic acid modified sorbent (CaO MA-10%) has the lowest average decay rate of 4.43 mg CO₂/cycle as compared to various acids used in this work. It is concluded that modified surface structure by employment of organic acids lead to the reduction of sintering and led towards better sorbents performance towards CO₂ capturing for multiple cycles.

在这项研究中，废蛋壳已用于利用有机酸合成结构改性的CaO，并用于基于热重分析（TGA）的系统中的CO ₂捕集。使用了不同的表征技术，如XRD，SEM / EDS，XRF，N ₂吸附-脱附（BET）和TGA，以研究CO ₂吸附的适用性。使用有机酸改性的CaO具有较高的表面积，孔结构易于升级，使CaO成为一种适合作为经济吸附剂用于CO ₂捕集的吸附剂。在20个周期内，三种有机酸改性的吸附剂实现了最高的转化率和稳定性。柠檬酸改性吸附剂（CaO CA-10％）获得了CO ₂在所用酸中，最高吸收量为0.38 g CO ₂ / g吸附剂（CaO转化率为55％），而就稳定性而言，苹果酸改性吸附剂（CaO MA-10％）的平均衰减率最低，为4.43 mg CO ₂与本工作中使用的各种酸相比 结论是，通过使用有机酸而改变的表面结构导致烧结的减少，并导致针对多个循环的CO ₂捕集更好的吸附剂性能。