Citation: YU Hui, CHEN Yan-Fei, GUO Hui-Qin, MA Wen-Tian, LI Jing, ZHOU Shui-Gen, LIN Sen, YAN Liu-Shui, LI Ke-Xin. Preparation of Molecularly Imprinted Carbon Microspheres by One-Pot Hydrothermal Method and Their Adsorption Properties to Perfluorooctane Sulfonate[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(11): 1776-1784. doi: 10.19756/j.issn.0253-3820.191305 shu

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

Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China

Received Date: 24 May 2019
Revised Date: 19 July 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21665018, 21366024), the Natural Science Foundation of Jiangxi Province, China (No. 20181BAB203014) and the Foundation of Jiangxi Educational Committee, China (No.GJJ160724).

Molecularly 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. Results showed that the adsorption kinetics of PFOS on both NIC and PFOS-MIC fitted well with the secondary-kinetic model (R² > 0.994). When the temperature was set at 20℃ and pH=3, the adsorption equilibrium time was 1.5 h and 3.0 h, respectively. The lower pH was positive to the adsorption. The adsorption isotherms data fitted better to the Langmuir model (R²>0.993) than that of Freundlich model, and the maximum adsorption capacity at 20℃ was 2930 and 5380 μg/g for NIC and PFOS-MIC, respectively. Adsorption selectivity results indicated that the PFOS-MIC had good adsorption selectivity for PFOS, even in coexistence with the structure analogue surfactants.
- Camellia oleifera seed shell,
- Hydrothermal method,
- Molecularly imprinted carbon microspheres,
- Perfluorooctane sulfonate
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