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<p>In the present study, electric arc furnace dust (EAFD) was modified by the photodeposition of different amounts of silver on its surface (0.25, 0.5, 1.0 and 2.0% wt./wt. Ag/EAFD). The photocatalytic activity of these materials was studied by analyzing the degradation of various pollutants, such as reactive black (RB5), oxytetracycline (OTC) and atrazine (ATZ). Characterizations showed that the main phases of EAFD are ZnO, MgO, SiO<sub>2</sub> and Fe<sub>3</sub>O<sub>4</sub>, in which ZnO and MgO represent 60.6 and 32.0% of the composition, respectively. The presence of Ag in the photocatalysts was also confirmed by scanning electron microscopy and energy dispersive spectroscopy. The bandgap values were 2.0&#xa0;eV for all materials. The results of the photocatalytic degradation of RB5, OTC and ATZ showed that the efficiency of the photocatalysts increased with the photodeposited Ag content. The photocatalyst with the highest Ag content (2.0 Ag/EAFD) degraded approximately 95, 97 and 67% of RB5, OTC and ATZ, respectively. Reactions in the presence of radical scavengers showed that ·O<sub>2</sub><sup>−</sup> contributes the most to the degradation of contaminants. Phytotoxicity tests using <i>Lactuca sativa</i> seeds showed that solutions after photocatalytic reaction did not show toxicity to plant germination and growth.</p>

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Photocatalytic degradation of organic contaminants by silver-modified electric arc furnace dust

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • S. G. de Moura,
  • M. E. S. Ferreira,
  • L. F. A. Vieira,
  • E. V. Miranda,
  • C. G. O. Bruziquesi,
  • A. de Campos,
  • F. Magalhães

摘要

In the present study, electric arc furnace dust (EAFD) was modified by the photodeposition of different amounts of silver on its surface (0.25, 0.5, 1.0 and 2.0% wt./wt. Ag/EAFD). The photocatalytic activity of these materials was studied by analyzing the degradation of various pollutants, such as reactive black (RB5), oxytetracycline (OTC) and atrazine (ATZ). Characterizations showed that the main phases of EAFD are ZnO, MgO, SiO2 and Fe3O4, in which ZnO and MgO represent 60.6 and 32.0% of the composition, respectively. The presence of Ag in the photocatalysts was also confirmed by scanning electron microscopy and energy dispersive spectroscopy. The bandgap values were 2.0 eV for all materials. The results of the photocatalytic degradation of RB5, OTC and ATZ showed that the efficiency of the photocatalysts increased with the photodeposited Ag content. The photocatalyst with the highest Ag content (2.0 Ag/EAFD) degraded approximately 95, 97 and 67% of RB5, OTC and ATZ, respectively. Reactions in the presence of radical scavengers showed that ·O2− contributes the most to the degradation of contaminants. Phytotoxicity tests using Lactuca sativa seeds showed that solutions after photocatalytic reaction did not show toxicity to plant germination and growth.