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<p>In a previous study, graphene oxide (GO)/Fe<sub>3</sub>O<sub>4</sub>/Ag nanocomposite was successfully synthesized with the potential to remove contaminants in water. However, the mechanism of the removal is still unclear. A more precise understanding of the removal process is required to bring the material to actual application. This study was proposed to answer whether the organic compound removal by the material is adsorption or degradation. Methylene blue (MB) was used as the model compound. In addition, the catalyst activity of GO/Fe<sub>3</sub>O<sub>4</sub>/Ag material in different conditions (oxidation with H<sub>2</sub>O<sub>2</sub> and reduction with NaBH<sub>4</sub>) was investigated and compared. The previous study showed that at a low concentration of MB (10&#xa0;ppm), adsorption is enough to remove 100% MB. At the higher concentration of MB (30&#xa0;ppm), oxidation with H<sub>2</sub>O<sub>2</sub> at pH 3 or reduction with NaBH<sub>4</sub> at pH 6 or 9 results in more effective removal with the %MB removal of up to 98.8% and %TOC removal of up to 91.2%. The characterizations by FTIR, BET, FESEM, AAS, and XRD of the material after the degradation showed that an acidic environment can dissolve the materials to some extent and therefore reduce the oxidation removal while the neutral and basic environment maintains the reuse ability of the materials after 5 cycles. With a dye wastewater sample pH = 6.5, using the material and NaBH<sub>4</sub> 0.02&#xa0;M can reduce COD by 75.9% and TOC by 63.3%. Thus, the material can serve as an excellent candidate for degradation of dye in wastewater.</p>

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Organic compound removal from water by graphene oxide/Fe3O4/Ag nanocomposite: adsorption and degradation with NaBH4 or H2O2

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Thi Thu Huong Le,
  • Thi Hong Hanh Nguyen,
  • Thi Thuong Ngo,
  • Thi Thanh Chu,
  • Thi Phuong Nga Han

摘要

In a previous study, graphene oxide (GO)/Fe3O4/Ag nanocomposite was successfully synthesized with the potential to remove contaminants in water. However, the mechanism of the removal is still unclear. A more precise understanding of the removal process is required to bring the material to actual application. This study was proposed to answer whether the organic compound removal by the material is adsorption or degradation. Methylene blue (MB) was used as the model compound. In addition, the catalyst activity of GO/Fe3O4/Ag material in different conditions (oxidation with H2O2 and reduction with NaBH4) was investigated and compared. The previous study showed that at a low concentration of MB (10 ppm), adsorption is enough to remove 100% MB. At the higher concentration of MB (30 ppm), oxidation with H2O2 at pH 3 or reduction with NaBH4 at pH 6 or 9 results in more effective removal with the %MB removal of up to 98.8% and %TOC removal of up to 91.2%. The characterizations by FTIR, BET, FESEM, AAS, and XRD of the material after the degradation showed that an acidic environment can dissolve the materials to some extent and therefore reduce the oxidation removal while the neutral and basic environment maintains the reuse ability of the materials after 5 cycles. With a dye wastewater sample pH = 6.5, using the material and NaBH4 0.02 M can reduce COD by 75.9% and TOC by 63.3%. Thus, the material can serve as an excellent candidate for degradation of dye in wastewater.