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.
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