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<p>Ionic organic dyes are the emerging pollutants that strongly influence to water environment. Adsorption of an anionic dye, Ponceau 4 R on SiO<sub>2</sub>-CeO<sub>2</sub> nanocomposites was investigated in the present study. The SiO<sub>2</sub>-CeO<sub>2</sub> nanocomposites with nanosilica rice husk were synthesized and examined by XRD, EDX, SEM, FT-IR, and ζ potential. The best conditions for Ponceau 4 R adsorption on SiO<sub>2</sub>-CeO<sub>2</sub> were obtained at pH 4, adsorption time 90&#xa0;min and 10&#xa0;mg/mL SiO<sub>2</sub>-CeO<sub>2</sub> dose. The removal efficiencies and the maximum adsorption capacity of Ponceau 4 R using SiO<sub>2</sub>-CeO<sub>2</sub> achieved greater than 99% and 15.63&#xa0;mg/g, respectively. Adsorption isotherms of Ponceau 4 R and on SiO<sub>2</sub>-CeO<sub>2</sub> increased with increasing ionic strengths that were represented by Langmuir, Freundlich, and Temkin models. A pseudo-second-order model was applicable to represent the kinetic of Ponceau 4 R adsorption on SiO<sub>2</sub>-CeO<sub>2</sub>. Based on the changes in SiO<sub>2</sub>-CeO<sub>2</sub> charge by zeta potential and vibrational groups by FT-IR, we demonstrate that electrostatic interactions mainly contributed to the Ponceau 4 R adsorption on SiO<sub>2</sub>-CeO<sub>2</sub> surfaces.</p>

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Adsorption characteristics of anionic azo dye Ponceau 4 R in water environment using SiO2-CeO2 nanocomposites: experimental consideration and modeling

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Thi Minh Hang Tran,
  • Thi Diu Dinh,
  • Thi Hoang Dan Dinh,
  • Thi Phuong Mai Nguyen,
  • Manh Khai Nguyen,
  • Minh Duc Vu,
  • Tien Duc Pham

摘要

Ionic organic dyes are the emerging pollutants that strongly influence to water environment. Adsorption of an anionic dye, Ponceau 4 R on SiO2-CeO2 nanocomposites was investigated in the present study. The SiO2-CeO2 nanocomposites with nanosilica rice husk were synthesized and examined by XRD, EDX, SEM, FT-IR, and ζ potential. The best conditions for Ponceau 4 R adsorption on SiO2-CeO2 were obtained at pH 4, adsorption time 90 min and 10 mg/mL SiO2-CeO2 dose. The removal efficiencies and the maximum adsorption capacity of Ponceau 4 R using SiO2-CeO2 achieved greater than 99% and 15.63 mg/g, respectively. Adsorption isotherms of Ponceau 4 R and on SiO2-CeO2 increased with increasing ionic strengths that were represented by Langmuir, Freundlich, and Temkin models. A pseudo-second-order model was applicable to represent the kinetic of Ponceau 4 R adsorption on SiO2-CeO2. Based on the changes in SiO2-CeO2 charge by zeta potential and vibrational groups by FT-IR, we demonstrate that electrostatic interactions mainly contributed to the Ponceau 4 R adsorption on SiO2-CeO2 surfaces.