Facile synthesis of ionic liquid modified silica nanoparticles for fast removal of anionic organic dyes with extremely high adsorption capacity

In this work, SiO2-ionic liquid (SiO2-PIL) composites were synthesized from amino groups containing SiO2 particles and imidazolium [C(16)VIm(+)] [Br] (ionic liquid) by the nucleophilic Michael addition reaction and the utilization of the composites for adsorptive removal of anion dyes was also examined in details. The adsorption performance was greatly improved since the presence of ionic liquid, and the practical maximum adsorption capacity of dye can as high as 243.67 mg/g in a very short timeframe. The results of fitting experimental data illustrate the effects of contact time, solution temperature, dye concentration, and pH. The kinetic and isotherm study confirms the pseudo-second-order model and the Langmuir model, respectively. The maximum monolayer adsorption capacity from Langmuir model can be as high as 2955.99 mg/g. The spontaneity and exothermicity of adsorption process can be also proved by data analysis. The novel method for fabrication of ionic liquid modified composites can be altered for environmental remediation or other practical application fields. (C) 2021 Published by Elsevier B.V.