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<p>The progress of nanocomposites for the effectual result in removal of hazardous pollutants are always in demand due to increasing water pollution. Converting solar energy directly into clean fuels has emerged as a promising approach for sustainable energy production and addressing environmental challenges. Considering this, the present study demonstrates α-Fe<sub>2</sub>O<sub>3</sub> and La-doped α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles for the efficient removal of azo dye present in aqueous solution by the photocatalytic property of the developed material and hydrogen production, which was synthesized via a hydrothermal route. XRD, FESEM, and BET characterizations were performed to investigate the impact of lanthanum doping in α-Fe<sub>2</sub>O<sub>3</sub> on photocatalytic ability. This study shows the tremendous degradation ability of synthesized nanoparticles towards Congo red dye over sunlight in a short duration of 5&#xa0;min, which was further confirmed by UV spectroscopy. The results showed the removal efficiency of α-Fe<sub>2</sub>O<sub>3</sub> is 59.3% after 5&#xa0;min which increases extraordinarily to 92% by doping of lanthanum. Additionally, a high mineralization rate of 89% was achieved, as determined through total organic carbon (TOC) analysis. Moreover, the LaFeO3 nanoparticles demonstrated a remarkable hydrogen evolution rate of 490&#xa0;<i>μ</i>molg<sup>−1</sup>&#xa0;h<sup>−1</sup>, which is nearly 3.5 times than that of pure α-Fe<sub>2</sub>O<sub>3</sub>. The interaction between La and α-Fe<sub>2</sub>O<sub>3</sub> was found to promote the generation of h<sup>+</sup> radicals, as confirmed by radical trapping experiments. Our findings specify that the La-doped α-Fe<sub>2</sub>O<sub>3</sub> synthesized nanomaterial has a great potential for the removal of dye from industrial waste like Congo red from pollutants.</p>

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Natural Sunlight-Assisted Degradation of Organic Pollutants and Hydrogen Evolution Using La-Doped α-Fe2O3 Photocatalyst

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Preety Yadav,
  • Neeraj Dhariwal,
  • Manju Kumari,
  • Vinod Kumar,
  • O. P. Thakur

摘要

The progress of nanocomposites for the effectual result in removal of hazardous pollutants are always in demand due to increasing water pollution. Converting solar energy directly into clean fuels has emerged as a promising approach for sustainable energy production and addressing environmental challenges. Considering this, the present study demonstrates α-Fe2O3 and La-doped α-Fe2O3 nanoparticles for the efficient removal of azo dye present in aqueous solution by the photocatalytic property of the developed material and hydrogen production, which was synthesized via a hydrothermal route. XRD, FESEM, and BET characterizations were performed to investigate the impact of lanthanum doping in α-Fe2O3 on photocatalytic ability. This study shows the tremendous degradation ability of synthesized nanoparticles towards Congo red dye over sunlight in a short duration of 5 min, which was further confirmed by UV spectroscopy. The results showed the removal efficiency of α-Fe2O3 is 59.3% after 5 min which increases extraordinarily to 92% by doping of lanthanum. Additionally, a high mineralization rate of 89% was achieved, as determined through total organic carbon (TOC) analysis. Moreover, the LaFeO3 nanoparticles demonstrated a remarkable hydrogen evolution rate of 490 μmolg−1 h−1, which is nearly 3.5 times than that of pure α-Fe2O3. The interaction between La and α-Fe2O3 was found to promote the generation of h+ radicals, as confirmed by radical trapping experiments. Our findings specify that the La-doped α-Fe2O3 synthesized nanomaterial has a great potential for the removal of dye from industrial waste like Congo red from pollutants.