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<p>The presence of bisphenol A (BPA) in the environment is becoming an increasingly serious threat to human health, and its removal is crucial. In the current study, a novel adsorbent based on C18 functionalized silica-coated iron oxide nanoparticles (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-C18) was prepared for the adsorptive removal of BPA from water. First, magnetic Fe<sub>3</sub>O<sub>4</sub> NPs were prepared and coated with porous silica particles by the sol–gel method to prepare Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>. Then, surface functionalization of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> was carried out with octadecyl dimethyl chlorosilane to prepare Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-C18. The developed adsorbent was characterized by elemental analysis, FTIR spectroscopy, SEM, TEM, XRD analysis, BET, and BJH analysis. The effect of various parameters such as concentration, adsorbent dose, contact time, and pH on BPA adsorption was studied during batch adsorption experiments. Maximum adsorption capacity (473.224&#xa0;mg/g) and removal efficiency (94%) were achieved with the following parameters: concentration (60&#xa0;mg/L), sorbent dose (10&#xa0;mg/L), pH (6), and contact time (90&#xa0;min). The isotherm and kinetics studies show that the adsorption of BPA onto Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-C18 followed the Langmuir isotherm and pseudo 2nd-order model, respectively. The adsorbent was regenerated, and the removal efficiency dropped only by 20% after using it 30 times.</p>

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Efficient removal of bisphenol A from water using C18 functionalized silica-coated iron oxide nanoparticles

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Tahira Bibi,
  • Ashraf Ali,
  • Sarah Alharthi,
  • Eman Y. Santali

摘要

The presence of bisphenol A (BPA) in the environment is becoming an increasingly serious threat to human health, and its removal is crucial. In the current study, a novel adsorbent based on C18 functionalized silica-coated iron oxide nanoparticles (Fe3O4@SiO2-C18) was prepared for the adsorptive removal of BPA from water. First, magnetic Fe3O4 NPs were prepared and coated with porous silica particles by the sol–gel method to prepare Fe3O4@SiO2. Then, surface functionalization of Fe3O4@SiO2 was carried out with octadecyl dimethyl chlorosilane to prepare Fe3O4@SiO2-C18. The developed adsorbent was characterized by elemental analysis, FTIR spectroscopy, SEM, TEM, XRD analysis, BET, and BJH analysis. The effect of various parameters such as concentration, adsorbent dose, contact time, and pH on BPA adsorption was studied during batch adsorption experiments. Maximum adsorption capacity (473.224 mg/g) and removal efficiency (94%) were achieved with the following parameters: concentration (60 mg/L), sorbent dose (10 mg/L), pH (6), and contact time (90 min). The isotherm and kinetics studies show that the adsorption of BPA onto Fe3O4@SiO2-C18 followed the Langmuir isotherm and pseudo 2nd-order model, respectively. The adsorbent was regenerated, and the removal efficiency dropped only by 20% after using it 30 times.