Cho Kyungil, Kang Yeryeong, Chae Sukbyung, Kim Changhyuk
School of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea.
Department of Mechanical Engineering, Korea University of Technology and Education, Cheonan 31253, Republic of Korea.
Nanomaterials (Basel). 2023 Jan 9;13(2):281. doi: 10.3390/nano13020281.
Magnesium oxide (MgO) has been investigated as a wet mineral carbonation adsorbent due to its relatively low adsorption and regeneration temperatures. The carbon dioxide (CO) capture efficiency can be enhanced by applying external force on the MgO slurry during wet carbonation. In this study, two aerosol-processed MgO nanoparticles were tested with a commercial MgO one to investigate the external force effect on the wet carbonation performance at room temperature. The MgO nano-adsorbents were carbonated and sampled every 2 h up to 12 h through forced and non-forced wet carbonations. Hydrated magnesium carbonates (nesquehonite, artinite and hydromagnesite) were formed with magnesite through both wet carbonations. The analyzed results for the time-dependent chemical compositions and physical shapes of the carbonation products consistently showed the enhancement of wet carbonation by the external force, which was at least 4 h faster than the non-forced carbonation. In addition, the CO adsorption was enhanced by the forced carbonation, resulting in a higher amount of CO being adsorbed by MgO nanoparticles than the non-forced carbonation, unless the carbonation processes were completed. The adsorbed amount of CO was between the maximum theoretical amounts of CO adsorbed by nesquehonite and hydromagnesite.
氧化镁（MgO）因其相对较低的吸附和再生温度而被作为一种湿式矿物碳酸化吸附剂进行研究。在湿式碳酸化过程中，通过对MgO浆料施加外力可以提高二氧化碳（CO₂）的捕集效率。在本研究中，对两种气溶胶法制备的MgO纳米颗粒与一种市售MgO进行了测试，以研究室温下外力对湿式碳酸化性能的影响。通过强制和非强制湿式碳酸化，对MgO纳米吸附剂进行碳酸化处理，并每2小时取样一次，直至12小时。通过两种湿式碳酸化，菱镁矿都与水合碳酸镁（三水碳酸镁、二水碳氧镁石和碱式碳酸镁）一起形成。对碳酸化产物随时间变化的化学成分和物理形态的分析结果一致表明，外力可增强湿式碳酸化，其速度比非强制碳酸化至少快4小时。此外，强制碳酸化增强了CO₂的吸附，导致MgO纳米颗粒吸附的CO₂量比非强制碳酸化时更高，除非碳酸化过程完成。CO₂的吸附量介于三水碳酸镁和碱式碳酸镁吸附CO₂的最大理论量之间。
