CO capture and sequestration in stable Ca-oxalate, via Ca-ascorbate promoted green reaction.

The increase in the amount of carbon dioxide (CO) emissions related to many anthropic activities is a persistent and growing problem. During the last years, many solutions have been set out, none of them being the ultimate one. Investigators agree on the need of a synergic approach to the problem, in terms of many complementary methods of sequestration that, combined with the reduction of production, will be able to decrease the concentration of the CO in the atmosphere. In this work, we explore the use of a green reaction to trap the CO into a stable crystalline phase (weddellite) resorting to a multidisciplinary approach. CO is reduced and precipitated as calcium oxalate through vitamin C as a sacrificial reductant. Calcium oxalate crystals obtained show a startling good quality that increases their already great stability over a wide chemical and physical conditions' range.