Scholarlink

<p>The synthesis of an efficient composite photo-Fenton nanocatalyst was investigated using acid leaching processes of copper slag (<i>CS</i>) with two types of citric acid (EC = edible and AR = analytical-grade reagent). For this purpose, citric acid at room temperature or at 40&#xa0;°C was used to lixiviate the elements from <i>CS</i>, and then, the leachates were subjected to a thermal treatment (350&#xa0;°C). The formation of maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) accompanied with calcite as the main mineralogical phase was observed by X-ray diffraction (XRD) studies. The development of nanospheres dispersed in the calcite matrix and the proportion of γ-Fe<sub>2</sub>O<sub>3</sub> in the catalyst or composite material were revealed by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively. The catalyst performance in the Fenton and photo-Fenton processes was investigated in the degradation of the indigo carmine dye (<i>IC</i>, 10&#xa0;ppm), achieving an efficiency of 96.1 ± 2.1% in 60&#xa0;min, using 5&#xa0;mM of H<sub>2</sub>O<sub>2</sub> (30% weight) and UV-light (<i>λ</i> = 365&#xa0;nm). The activity of these materials was analyzed and compared as a function of the specific surface area and the % γ-Fe<sub>2</sub>O<sub>3</sub> in the composites. The preparation of maghemite-rich nanocomposite using the <i>CS</i> leachate, generated with edible citric acid, is an excellent alternative to substitute materials produced with analytical grade reagents because in the removal of <i>IC</i> dye, it showed similar efficiency, kinetics, and stability, but with lesser requirements of lamp energy radiation and doses of photocatalyst and oxidant, with respect to data reported in the literature.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Copper metallurgical slag as a sustainable precursor of iron oxide photocatalysts to remove indigo carmine dye from water using the photo-Fenton process

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月19日

查看全文
  • Karen Valencia García,
  • Melisa Portilla-Sangabriel,
  • Agileo Hernández-Gordillo,
  • Tania-Ariadna García-Mejía,
  • Rosa-María Ramírez-Zamora

摘要

The synthesis of an efficient composite photo-Fenton nanocatalyst was investigated using acid leaching processes of copper slag (CS) with two types of citric acid (EC = edible and AR = analytical-grade reagent). For this purpose, citric acid at room temperature or at 40 °C was used to lixiviate the elements from CS, and then, the leachates were subjected to a thermal treatment (350 °C). The formation of maghemite (γ-Fe2O3) accompanied with calcite as the main mineralogical phase was observed by X-ray diffraction (XRD) studies. The development of nanospheres dispersed in the calcite matrix and the proportion of γ-Fe2O3 in the catalyst or composite material were revealed by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively. The catalyst performance in the Fenton and photo-Fenton processes was investigated in the degradation of the indigo carmine dye (IC, 10 ppm), achieving an efficiency of 96.1 ± 2.1% in 60 min, using 5 mM of H2O2 (30% weight) and UV-light (λ = 365 nm). The activity of these materials was analyzed and compared as a function of the specific surface area and the % γ-Fe2O3 in the composites. The preparation of maghemite-rich nanocomposite using the CS leachate, generated with edible citric acid, is an excellent alternative to substitute materials produced with analytical grade reagents because in the removal of IC dye, it showed similar efficiency, kinetics, and stability, but with lesser requirements of lamp energy radiation and doses of photocatalyst and oxidant, with respect to data reported in the literature.