Bai Penn, Sharratt Paul, Yeo Tze Yuen, Bu Jie
J Nanosci Nanotechnol. 2014 Sep;14(9):6915-22. doi: 10.1166/jnn.2014.8963.
As the current cost of mineral carbonation is too high for an economically viable industrial process, it is desirable to produce value-added products from CO2 mineralization process. In this work, a facile and cost-effective process was developed for the production of high purity SiO2 from acid-leached serpentine residue. The Si extraction rate is fast even under ambient conditions due to the highly defective structure of the residue. The reaction kinetics were studied and it was found that the Si extraction rate was under a combination of chemical reaction control and film diffusion control. The SiO2 sample prepared has high purity with a nanoporous structure, which renders it a potential candidate for applications such as an adsorbent and a catalyst support.
由于目前矿物碳酸化的成本对于经济可行的工业过程来说过高，因此期望从二氧化碳矿化过程中生产增值产品。在这项工作中，开发了一种简便且具有成本效益的方法，用于从酸浸蛇纹石残渣中生产高纯度二氧化硅。由于残渣的高度缺陷结构，即使在环境条件下，硅的提取率也很快。对反应动力学进行了研究，发现硅的提取率受化学反应控制和膜扩散控制的共同影响。所制备的二氧化硅样品具有高纯度和纳米多孔结构，这使其成为吸附剂和催化剂载体等应用的潜在候选材料。
