The adsorption performances of salicylhydroxamic acid-functionalized polystyrene-grafted SiO₂ particles toward quercetin

Abstract

Firstly, polystyrene (PS)-grafted silica (SiO₂) particles were prepared by means of “grafting from”, and then chloromethylated with 1,4-dichloromethoxybutane to obtain chloromethylstyrene (CMPS)-grafted particles CMPS/SiO₂. Finally, salicylhydroxamic acid (SHA) was bonded to CMPS/SiO₂ particles by nucleophilic substitution reaction, so as to prepare SHA-functionalized adsorption materials SHA-PS/SiO₂. The adsorption characteristics of them for quercetin are studied in depth by using static and dynamic methods, and the adsorption thermodynamics is investigated. The experimental results show that SHA-PS/SiO₂ has good adsorption properties for quercetin with a very great adsorption capacity (1.5 mmol/g) due to the synergy of various interactions between SHA-PS/SiO₂ and quercetin, such as π–π stack, π-type hydrogen bond, conventional hydrogen bond and hydrophobic interaction. The adsorption isotherm data matches the Langmuir model. The adsorption process of SHA-PS/SiO₂ toward quercetin is exothermic and driven by enthalpy. Besides, the adsorption materials still have good reusability.

Keywords:

• Adsorption
• grafting particles
• polystyrene
• quercetin
• salicylhydroxamic acid

Declaration of interest statement

There are no conflicts to declare.

Additional information

Funding

This work was supported by the Natural Science Foundation of the Shanxi Province of China (No. 201801D121069) and National Natural Science Foundation of China (No. 21805249).