Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220136.doi: 10.7503/cjcu20220136

• Organic Chemistry • Previous Articles     Next Articles

Template Simulation of Organophosphorus Nerve Agent Molecularly Imprinted Polymers

WENG Meiqi1, SHANG Guiming1, WANG Jiatai1, LI Shenghua1, FAN Zhi1, LIN Song2, GUO Minjie1()   

  1. 1.College of Chemical Engineering and Materials,Tianjin University of Science and Technology,Tianjin 300457,China
    2.Institute of Medical Support Technology,Academy of Military Sciences,Tianjin 300161,China
  • Received:2022-03-03 Online:2022-08-10 Published:2022-04-15
  • Contact: GUO Minjie E-mail:guomj@tust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21804099);the Tianjin Science and Technology Major Project Program- Science and Technology Military-Civilian Integration Project, China(18ZXJMTG00070);the Central Guidance on Local Science and Technology Development Fund, China(21ZYQCSY00050)

Abstract:

We herein firstly present paraoxon(PO) can be alternative to bis(4-nitrophenyl) phosphate(BNPP) as template simulants of organophosphorus nerve agents molecularly imprinted polymers(MIPs). Geometric optimization and frequency computational calculation of template-monomer complexes were carried out by B3LYP-D3(BJ)/6-31G(dp) level of DFT theory. The configuration stability and binding energy of the complexes formed by both BNPP and PO with various functional monomers were compared and discussed in detail. And it was confirmed that the bifunctional monomer system composed of 4-methylacrylamide antipyrine(MAAP) and methacrylic acid(MAA) were the optimum monomers in this study. Then the core-shell MIPs of SiO2@BNPP were prepared by the surface molecular imprinting technology with BNPP as template molecule, MAAP-MAA as monomers, ethylene glycol dimethacrylate(EGDMA) as crosslinker, and silica nanoparticles as supports. The surface morphology of MIPs was analyzed with SEM and TEM, and then the adsorption properties of the MIPs were measured. The results showed that the maximum absorption capacity of the derived MIPs to BNPP template was 19.03 mg/g when n(BNPP)/n(MAAP)/n(MAA)/ n(EGDMA) was 1∶1∶4∶20. The separation coefficient of MIPs to 4-nitrophenol(4-NP) was 17.50. Furthermore, MIPs had rapid adsorption ability to the BNPP templates, which could reach 92% of the adsorption equilibrium in 5 min, and the adsorption equilibrium time was only 15 min. The MIPs still maintained good reusability after 5 times of reuse. The adsorption process of MIPs to the template was appropriately described by pseudo second-order kinetic model and Langmuir isothermal adsorption equation. Scatchard equation analysis showed that MIPs had two classes of adsorption sites. The consistency between the experimental results and the computational simulation shows that the computational calculation simulation is helpful for the design of organophosphorus nerve agent MIPs.

Key words: Computational simulation, Organophosphorus nerve agent, Surface molecularly imprinted polymer, Bis(p-nitrophenyl) phosphate, Paraoxon

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