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<p>The pure Ca<sub>2</sub>V<sub>2</sub>O<sub>7</sub> nanomaterial was successfully synthesized via a coprecipitation technique followed by annealing at 550&#xa0;°C. Comprehensive characterization using XRD, UV–vis DRS, FTIR, BET, HRTEM, and XPS confirmed its crystalline phase, optical properties, surface morphology, and elemental composition. Photocatalytic evaluations under visible light irradiation (250 W metal halide lamp) revealed remarkable activity in the degradation of organic pollutants, achieving 79.5% removal of safranine O dye and 80.6% removal of tetracycline hydrochloride antibiotics within 180&#xa0;min. These pollutants are of global environmental concern due to their persistence and harmful impacts on aquatic ecosystems. In addition to environmental remediation, the Ca<sub>2</sub>V<sub>2</sub>O<sub>7</sub> nanomaterial was employed for photocatalytic hydrogen generation as a sustainable energy approach to reduce reliance on fossil fuels. Using Na<sub>2</sub>S and Na<sub>2</sub>SO<sub>3</sub> as sacrificial electron donors, bare Ca<sub>2</sub>V<sub>2</sub>O<sub>7</sub> exhibited a significantly higher hydrogen evolution rate compared to TiO<sub>2</sub> and pure water, producing a total of 1474&#xa0;μmol H<sub>2</sub> over 26&#xa0;h with only 0.05&#xa0;g catalyst. Electrochemical analysis and band structure evaluations indicated that its superior performance arises from efficient charge separation and favorable band edge positions. Furthermore, XRD analysis after prolonged photocatalysis confirmed the structural stability of Ca<sub>2</sub>V<sub>2</sub>O<sub>7</sub>, underscoring its potential for long-term practical applications in both clean energy production and environmental remediation.</p>

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Visible-light driven multifunctional Ca2V2O7 photocatalyst for sustainable hydrogen generation and degradation of organic pollutants

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Abhishek Tripathy,
  • Km Hema Kumari,
  • Sudhanshu Pati,
  • Naveen Kumar Veldurthi

摘要

The pure Ca2V2O7 nanomaterial was successfully synthesized via a coprecipitation technique followed by annealing at 550 °C. Comprehensive characterization using XRD, UV–vis DRS, FTIR, BET, HRTEM, and XPS confirmed its crystalline phase, optical properties, surface morphology, and elemental composition. Photocatalytic evaluations under visible light irradiation (250 W metal halide lamp) revealed remarkable activity in the degradation of organic pollutants, achieving 79.5% removal of safranine O dye and 80.6% removal of tetracycline hydrochloride antibiotics within 180 min. These pollutants are of global environmental concern due to their persistence and harmful impacts on aquatic ecosystems. In addition to environmental remediation, the Ca2V2O7 nanomaterial was employed for photocatalytic hydrogen generation as a sustainable energy approach to reduce reliance on fossil fuels. Using Na2S and Na2SO3 as sacrificial electron donors, bare Ca2V2O7 exhibited a significantly higher hydrogen evolution rate compared to TiO2 and pure water, producing a total of 1474 μmol H2 over 26 h with only 0.05 g catalyst. Electrochemical analysis and band structure evaluations indicated that its superior performance arises from efficient charge separation and favorable band edge positions. Furthermore, XRD analysis after prolonged photocatalysis confirmed the structural stability of Ca2V2O7, underscoring its potential for long-term practical applications in both clean energy production and environmental remediation.