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<p>The presence of herbicides in aquatic environments has become an escalating environmental issue. This work reports the synthesis of molecularly imprinted (MIP) and non-imprinted (NIP) polymers through precipitation polymerization, using sulfentrazone as the template. Acrylic acid served as the functional monomer, with ethylene glycol dimethacrylate (EGDMA) as the crosslinking agent, potassium persulfate (KPS) as the initiator, and ethanol as the solvent. The resulting materials were characterized using Thermogravimetry (TGA), and Scanning Electron Microscopy (SEM) techniques. The pH tests demonstrated that removing sulfentrazone was more efficient in acidic media, with greater performance at pH close to the point of zero charge (pH<sub>PZC</sub>). The kinetic study revealed an equilibrium time of 120&#xa0;min and a removal efficiency of 66% and the process followed the first-order model, and the material achieving a maximum adsorption capacity of 2528.4 (µg g<sup>−1</sup>). The Langmuir model presented the best fit in the adsorption isotherms, with a maximum capacity of 12,846.62 (µg g<sup>−1</sup>) and a correlation coefficient (R<sup>2</sup>) of 0.9987. The selectivity of the MIP was evaluated by comparing the adsorption of sulfentrazone with other contaminants, including diclosulam, diuron and 2,4-dichlorophenoxyacetic acid (2,4-D). The observed adsorption values were: sulfentrazone 1,029.97 (µg g<sup>−1</sup>), diclosulam 334.14 (µg g<sup>−1</sup>), diuron 583.71 (µg g<sup>−1</sup>) and 2,4-D (76.25&#xa0;µg&#xa0;g<sup>−1</sup>). These results highlight MIP as an excellent adsorbent, with high removal capacity and significant selectivity in aqueous solutions, reinforcing its potential for application in environmental decontamination processes.</p>

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Design and Evaluation of Molecularly Imprinted Polymers for Targeted Sulfentrazone Removal

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Ytalo Cleyton Dos Santos Souza,
  • Júlia Paula Lima de Araújo,
  • Caio Alisson Diniz da Silva,
  • Patricia Mendonça Pimentel,
  • Paulo Sérgio Fernandes das Chagas,
  • Sajjad Hussain,
  • Sabir Khan

摘要

The presence of herbicides in aquatic environments has become an escalating environmental issue. This work reports the synthesis of molecularly imprinted (MIP) and non-imprinted (NIP) polymers through precipitation polymerization, using sulfentrazone as the template. Acrylic acid served as the functional monomer, with ethylene glycol dimethacrylate (EGDMA) as the crosslinking agent, potassium persulfate (KPS) as the initiator, and ethanol as the solvent. The resulting materials were characterized using Thermogravimetry (TGA), and Scanning Electron Microscopy (SEM) techniques. The pH tests demonstrated that removing sulfentrazone was more efficient in acidic media, with greater performance at pH close to the point of zero charge (pHPZC). The kinetic study revealed an equilibrium time of 120 min and a removal efficiency of 66% and the process followed the first-order model, and the material achieving a maximum adsorption capacity of 2528.4 (µg g−1). The Langmuir model presented the best fit in the adsorption isotherms, with a maximum capacity of 12,846.62 (µg g−1) and a correlation coefficient (R2) of 0.9987. The selectivity of the MIP was evaluated by comparing the adsorption of sulfentrazone with other contaminants, including diclosulam, diuron and 2,4-dichlorophenoxyacetic acid (2,4-D). The observed adsorption values were: sulfentrazone 1,029.97 (µg g−1), diclosulam 334.14 (µg g−1), diuron 583.71 (µg g−1) and 2,4-D (76.25 µg g−1). These results highlight MIP as an excellent adsorbent, with high removal capacity and significant selectivity in aqueous solutions, reinforcing its potential for application in environmental decontamination processes.