Effect of Benzotriazole-Silver-Based Capping System on Porosity of Mesoporous Silica Nanoparticles Synthesized Using Eco-Friendly Materials of Rice Husk

The mesoporous silica nanoparticle (MSN) is a material with easily controllable pore size and excellent surface area to develop into a corrosion inhibitor nanocarrier, a protective coating specially produced by a nanocomposite layer to keep or release anticorrosive active compounds. Nonetheless, the MSN is not weakness-free, which cannot impede corrosion propagation actively. Special treatment for overcoming is developing the benzotriazole-silver (BTA-Ag)-based capping system, with advantages that can exploit the double anticorrosive mechanism by adjusting anticorrosive active compound release while capturing chloride ions, leading to active self-healing. Therefore, this work identifies the effect of developing a capping system based on BTA-Ag on the porosity properties of MSN as an initial step in preparing corrosion inhibitor nanocarrier. Rice husks were chosen as eco-friendly materials to replace commercial precursors because of their abundance, the same orthosilicate structure, and the high purity of silica. With excellent levels of safety and uniformity, this work uses the sol-gel method to reduce the synthesis energy or cost. The outcome indicates that the porosity characteristics of these nanoparticles are significantly impacted by the BTA-Ag-based capping method. The pore size shrank to 2.5 nm from 2.6 nm. Additionally, the surface area decreased dramatically from 653.149 to 41.725 m 2 /g. Moreover, the pore volume dropped from 0.9 to 0.1 cm 3 /g. However, it had a comparable morphology, varied in size, and a specific aggregation level, indicating the presence of densely packed rod-like micelles during the MSN synthesis. The sample was confirmed to be porous since the isotherm graph was of type IV. It was highly reactive due to silanol and siloxane groups, signaling bonds with the silica matrix being the main component.