Preparation of grafted adsorbent CPVA-g-PMAA and its adsorption performance for amlodipine

Abstract

A grafted CPVA-g-PMAA adsorbent was synthesized by surface-initiated grafted polymerization. The monomer methacrylic acid (MAA), initiation cerium sulfate amine, catalyst sulfuric acid (H₂SO₄), reaction time and reaction temperature was investigated, respectively, to obtain optimal grafted degree CPVA-g-PMAA membrane. The CPVA-g-PMAA adsorbent was characterized by Fourier transform infrared spectrometer, optical microscope, SEM, Zeta potential and Solid-State ¹³C nuclear magnetic resonance and the Brunauer-Emmett-Teller and employed by adsorbent for amlodipine (ADP). The adsorption capacity of CPVA-g-PMAA for ADP reaches 1.43 mg/cm² in methanol, better than in DIW and dimethyl formamide. The pseudo-second-order (PSO) model is fit adsorption kinetic for the effect of temperature, and pseudo-first-order is better than PSO at different temperature. The adsorption capacity increases with rising ionic strength and decreasing temperature, and it reaches 1.44 mg/cm². The D–R adsorption isotherm model is more fit the adsorption of CPVA-g-PMAA for ADP. The adsorption property of CPVA-g-PMAA for ADP is still good even in simulated wastewater, and the adsorbent is stable. It is potential to adsorb ADP from pharmaceutical wastewater.

Graphical Abstract

Keywords:

• CPVA-g-PMAA
• microfiltration membrane
• amlodipine
• adsorption

Acknowledgments

We are grateful of the financial support of this research project by National Natural Science Foundation of China (21805249), Research Project Supported by Shanxi Scholarship Council of China (2020-100).