Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University , Wuhan 430079, China.
Environ Sci Technol. 2017 Jan 3;51(1):552-559. doi: 10.1021/acs.est.6b04100. Epub 2016 Dec 16.
Nowadays, capturing anthropogenic CO in a highly efficient and cost-effective way is one of the most challenging issues. Herein, the key parameters to stabilize CO uptake capacity have been studied based on four kinds of pure calcium oxides (CaO) prepared by a simple calcination method with four different calcium precursors. A simple ideal particle model was proposed to illustrate the uniform distribution of pure CaO, in which the CO uptake capacity is positively related with surface area of CaO particles and the stability is opposite to the distance between two CaO particles after carbonation. The adsorption capacity of the best sample with a distance of 398 nm between two CaO particles after carbonation only lost 0.344% per cycle, which is originated from the low possibility of the agglomeration between neighboring particles. On the basis of the proposed model, the composite with magnesium oxide (MgO) distributed uniformly in CaO was fabricated by a simple ball milling method, which possessed an excellent stability with a decay rate of only 3.9% over 100 carbonation-calcination cycles. In this case, MgO played as inert to increase the distance between CaO particles for agglomeration prevention.
如今，以高效且经济的方式捕获人为产生的 CO 是最具挑战性的问题之一。在此，基于四种通过简单煅烧法用四种不同钙前体制备的纯氧化钙（CaO），研究了稳定 CO 吸收能力的关键参数。提出了一种简单的理想颗粒模型来解释纯 CaO 的均匀分布，其中 CO 吸收能力与 CaO 颗粒的表面积呈正相关，而稳定性与碳化后两个 CaO 颗粒之间的距离呈反比。碳化后两个 CaO 颗粒之间距离为 398nm 的最佳样品的吸附容量每循环仅损失 0.344%，这源于相邻颗粒之间团聚的可能性较低。在此模型的基础上，通过简单的球磨法制备了氧化镁（MgO）均匀分布在 CaO 中的复合材料，其具有优异的稳定性，在 100 次碳化-煅烧循环中仅衰减 3.9%。在这种情况下，MgO 作为惰性物质发挥作用，增加了 CaO 颗粒之间的距离，以防止团聚。
