Preparation and Adsorption Properties of MCM-41 with Novel Gemini Ionic Liquid Surfactants as Template

• Main Authors: Bai, Y. (Author), Li, Q. (Author), Wang, J. (Author), Yang, X. (Author)
• Format: Article
• Language: English
• Published: MDPI 2022
• Subjects: Adsorption; Adsorption kinetics; Adsorption process; Adsorption properties; crystal violet; Crystal violet; Gemini ionic liquid surfactants; Geminus ionic liquid surfactant; Hydrothermal synthesis; Ionic liquid surfactants; Ionic liquids; kinetics; Kinetics; Mesoporous materials; mesoporous molecular sieves; Mesoporous molecular sieves; Molecular sieves; Pore size; Pore structure; Propane; Propane dibromide; Sieves; Silica; Surface active agents; Symmetrics; Synthesis method; thermodynamics; Thermodynamics
• Online Access: View Fulltext in Publisher

 A mesoporous molecular sieve was prepared by the hydrothermal synthesis method with symmetric Gemini surfactant 1,3-bis(hexadecyldimethylammonio)-propane dibromide, symmetric Gemini ionic liquid surfactant 1,3-bis(3-hexadecylimidazolium-1-yl) propane dibromide and self-designed asymmetric Gemini ionic liquid surfactant 1-(3-(hexadecyldimethylammonio)prop-1-yl)-3-hexadecylimidazolium dibromide as the template agent. The structure characterization results for mesoporous molecular sieves show that the material possesses a hexagonal pore structure with uniform channels. The mesoporous silica that was synthesized with self-designed asymmetric Gemini ionic liquid surfactant as the template agent possesses the largest surface area and its pore size and specific surface area are, respectively, 3.28 nm and 879.37 m2/g. The adsorption properties of the prepared MCM-41 for crystal violet were investigated, and the adsorption thermodynamics and kinetics were investigated. The results show that adsorption equilibrium can be reached under pH = 9 and 35 °C for 50 min, and the quantity of adsorption can reach up to 464.21 mg/g. The adsorption process belongs to Langmuir isothermal adsorption, conforming to second-order adsorption kinetics, and the adsorption process is an endothermic process. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.