A sustainable and eco-friendly rice husk-derived mesoporous silica nanoparticles loaded with benzotriazole for enhanced corrosion inhibition

초록

Corrosion prevention remains a critical global challenge, with inhibitor-loaded nanocontainers offering a promising route to long-term protection. In this study, mesoporous silica nanoparticles (MSNs) were sustainably synthesized from rice husk (RH) biomass via an eco-friendly sol-gel method, loaded with benzotriazole (BTA) by impregnation, and incorporated into an epoxy binder to develop a durable, bio-derived corrosion-inhibition system. Transmission electron microscopy revealed uniform particles with an average diameter of 55.3 nm, while X-ray diffraction confirmed the formation of the SiO2 phase. Nitrogen adsorption-desorption analysis indicated a pore diameter of 4.7 nm, a specific surface area of 16 m2 g-1, and a pore volume of 0.1 cm3 g-1. Corrosion rate testing using the weight-loss method showed a substantial reduction from 3.89 to 1.02 x 10-4 mm yr-1 with increasing BTA loading, consistent with electrochemical impedance spectroscopy results that demonstrated enhanced corrosion resistance and reduced double-layer capacitance. Surface morphology analysis confirmed that BTA effectively mitigated typical corrosion defects, including pits, cracks, and irregular deposits. For practical application, RH-MSN-BTA was dispersed into epoxy immediately before coating, ensuring uniform distribution, strong interfacial adhesion, controlled release at microcracks, and extended service life with reduced maintenance requirements. This approach integrates renewable nanocontainers, optimized inhibitor dosage, and in-situ epoxy incorporation to achieve high protection efficiency with environmental compatibility and energy savings.

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