<p>Nitrogen-containing compounds (NCCs) in liquid fuels negatively impact the environment, refining processes, and fuel quality, making their removal essential. In this study, pyridine was selected as a representative NCC in fuels, and a pyridine/n-octane solution was prepared as a model fuel. A mesoporous nanocomposite material, NiS₂/In₂S₃/ZnIn₂S₄ (NS/IS/ZIS), was synthesized via a sequential solvothermal method using ZnIn₂S₄ (ZIS) as the base material. Experimental results showed that, at a pyridine concentration of 140&#xa0;mg/L, the adsorption capacity of NS/IS/ZIS for pyridine reached 40.70&#xa0;mg/g. Compared to pure-phase ZIS, NS/IS/ZIS exhibits nearly a 60% increase in the equilibrium adsorption capacity for pyridine. The synergy among the multiple components of the composite significantly improved the adsorption efficiency. Based on the experimental data, adsorption kinetics and isotherms were fitted. The adsorption behavior followed a pseudo-second-order kinetic model. The adsorption of pyridine on pure-phase ZIS and NiS₂/In₂S₃ (NS/IS) conformed to the Langmuir isotherm model, while that on the NS/IS/ZIS composite fit the Freundlich isotherm model. Collectively, the findings reveal that NS/IS/ZIS exhibits a chemisorption-dominated multilayer adsorption mechanism.</p>