Protocol for Analytical Techniques and Identification of Reusable Silica from Acid Oxidative Purification

Abstract

Silica gel functions as an adsorbent employed in identification, separation, and purification techniques. It is commonly used to purify organic compounds. The primary objective of this study is to reduce operational expenses associated with the procurement of this compound by facilitating its reuse, thereby aiming to recover the commercial value. The recovery of silica entails a series of purification steps. Silica is roughly washing using water, followed by exhaustive oxidation using permanganate potassium (KMnO4(s)) and sulfuric acid (H2SO4), vacuum filtration, drying over the oven and sieving. Effectiveness of the treatment was detected by using different methods. Various analytical techniques were employed, such as Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDS),  Infrared Spectroscopy (IS), Thermogravimetry Analysis (TGA) and Differential Scanning Calorimetry (DSC). In summary, the costs associated with the treatment reagents, such as potassium permanganate, concentrated sulfuric acid and sodium oxalate (Na2C2O4(s)), have demonstrated that the method employed is an economical alternative process that can be done instead of purchasing a new product. The treatment of silica represents a viable alternative, offering a sustainable approach for its reuse.