Preparation of Molecularly Imprinted Carbon Microspheres by One-Pot Hydrothermal Method and Their Adsorption Properties to Perfluorooctane Sulfonate

Publication date: November 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 11Author(s): Hui YU, Yan-Fei CHEN, Hui-Qin GUO, Wen-Tian MA, Jing LI, Shui-Gen ZHOU, Sen LIN, Liu-Shui YAN, Ke-Xin LIAbstractMolecularly imprinted carbon microspheres (MIC) were synthesized by one-pot hydrothermal method with perfluorooctane sulfonate (PFOS) as template, Camellia oleifera seed shell as carbon precursor and phloroglucinol as additive. The as-prepared PFOS-MIC was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area and pore size distribution analyzer (BET), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetry/differential thermal analyzer (TG/DTA). The results of SEM, HRTEM and FT-IR showed that the PFOS-MIC had a particle size of about 1.5 μm, the activated binding sites were formed by a large number of interconnected hydrogen bonds. The adsorption properties of PFOS on PFOS-MIC and the corresponding non-imprinted carbon microspheres (NIC) such as adsorption kinetics, pH effect and adsorption isotherms were investigated. The results showed that the adsorption kinetics of PFOS on both NIC and PFOS-MIC fitted well with the secondary-kinetic model (R2> 0.994). Under the experimental conditions of 20 °C and pH = 3, the adsorption equilibrium time was 1.5 and 3.0 h, respectively. The lower pH was in favor of the adsorption. The adsorption isotherms data fitted better to the Langmuir model ...
Source: Chinese Journal of Analytical Chemistry - Category: Chemistry Source Type: research