Amine-Functionalized Natural Rubber/Mesostructured Silica Nanocomposites for Adsorptive Removal of Clofibric Acid in Aqueous Phase.

ABSTRACT: This study is the first report on the synthesis, characterization and application of amine-functionalized mesoporous nanocomposites based on natural rubber (NR) and wormhole-like mesostructured silica (WMS). In comparison with amine-functionalized WMS (WMS-NH₂), a series of NR/WMS-NH₂ composites were synthesized via an in situ sol-gel method in which the organo-amine group was grafted onto the nanocomposite surface via co-condensation with 3-aminopropyltrimethoxysilane (APS) as the amine-functional group precursor. The NR/WMS-NH₂ materials had a high specific surface area (115-492 m² g^-1) and total pore volume (0.14-1.34 cm³ g^-1) with uniform wormhole-like mesoporous frameworks. The amine concentration of NR/WMS-NH₂ (0.43-1.84 mmol g^-1) was increased with an increase in the APS concentration, corresponding to high levels of functionalization with the amine groups of 53-84%. The H₂O adsorption-desorption measurement revealed that NR/WMS-NH₂ possessed higher hydrophobicity than WMS-NH₂. The removal of clofibric acid (CFA), a xenobiotic metabolite of the lipid-lowering drug clofibrate, from the aqueous solution using WMS-NH₂ and NR/WMS-NH₂ materials was investigated using a batch adsorption experiment. The adsorption was a chemical process in which the pseudo-second order kinetic model expressed the sorption kinetic data better than the pseudo first-order and Ritchie-second kinetic order model. In addition, the CFA adsorption sorption equilibrium data of the NR/WMS-NH₂ materials were fitted to the Langmuir isotherm model. The NR/WMS-NH₂ with 5% amine loading had the highest CFA adsorption capacity (6.29 mg g^-1).

SUBMITTER: Yousatit S 

PROVIDER: S-EPMC10004768 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature