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<p>Nowadays, considerable fractions of emerging chemical contaminants are released into the environment by industries, hospitals, agriculture, and domestic sewage. Among these pollutants, Eriochrome black T (EbT) is a dye widely used in the textile, paper printing, leather, paint, cosmetics, and carpet manufacturing industries. The development of new materials for application in the environmental field aiming to remove EbT and other dyes from wastewater is essential in the characterization of a multi-walled carbon nanotubes with niobium(V) oxide (CNTs@Nb<sub>2</sub>O<sub>5</sub>) for the EbT removal by heterogeneous photocatalysis. CNT@Nb<sub>2</sub>O<sub>5</sub> demonstrated crystalline peaks of multi-wall carbon nanotubes and orthorhombic Nb<sub>2</sub>O<sub>5</sub> with a surface charge of + 16.7 ± 2.03&#xa0;mV. The ideal condition for the EbT photodegradation was the [CNT@Nb<sub>2</sub>O<sub>5</sub>] of 0.35&#xa0;g L<sup>−1</sup>, [EbT] of 40&#xa0;mg L<sup>−1</sup>, pH ≈ 1.70, and <i>T</i> of 298.15 ± 2&#xa0;K with 89.89% of the photodegradation after 180&#xa0;min under visible irradiation. Regarding photocatalytic activity, it presented a reusability after 5 cycles at acidic pH (1.7) with 89.89% (<i>k</i> = 0.0292&#xa0;min<sup>−1</sup>) of photodegradation in the first cycle and 75.64% (<i>k</i> = 0.0139&#xa0;min<sup>−1</sup>) in the last one. In total, a dye removal capacity of 88.89% (photodegradation) was observed. These results make CNT@Nb<sub>2</sub>O<sub>5</sub> a promising nanomaterial for removing dyes from effluents.</p> Graphical Abstract <p></p>

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A novel nanocatalyst of the multi-walled carbon nanotubes decorated with niobium pentoxide for the Eriochrome black T dye degradation

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Claudir Gabriel Kaufmann Jr,
  • Daniel Moro Druzian,
  • William Leonardo da Silva,
  • Rubia Young Sun Zampiva,
  • Marco Rossi,
  • Giovani Pavoski,
  • Denise Crocce Romano Espinosa,
  • Annelise Kopp Alves,
  • Carlos Pérez Bergmann,
  • Cristiano Rodrigo Bohn Rhoden,
  • Sergio Roberto Mortari

摘要

Nowadays, considerable fractions of emerging chemical contaminants are released into the environment by industries, hospitals, agriculture, and domestic sewage. Among these pollutants, Eriochrome black T (EbT) is a dye widely used in the textile, paper printing, leather, paint, cosmetics, and carpet manufacturing industries. The development of new materials for application in the environmental field aiming to remove EbT and other dyes from wastewater is essential in the characterization of a multi-walled carbon nanotubes with niobium(V) oxide (CNTs@Nb2O5) for the EbT removal by heterogeneous photocatalysis. CNT@Nb2O5 demonstrated crystalline peaks of multi-wall carbon nanotubes and orthorhombic Nb2O5 with a surface charge of + 16.7 ± 2.03 mV. The ideal condition for the EbT photodegradation was the [CNT@Nb2O5] of 0.35 g L−1, [EbT] of 40 mg L−1, pH ≈ 1.70, and T of 298.15 ± 2 K with 89.89% of the photodegradation after 180 min under visible irradiation. Regarding photocatalytic activity, it presented a reusability after 5 cycles at acidic pH (1.7) with 89.89% (k = 0.0292 min−1) of photodegradation in the first cycle and 75.64% (k = 0.0139 min−1) in the last one. In total, a dye removal capacity of 88.89% (photodegradation) was observed. These results make CNT@Nb2O5 a promising nanomaterial for removing dyes from effluents.

Graphical Abstract