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One-pot sol-gel synthesis of GdPrO3 with enhanced photocatalytic performance under simulated sunlight
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DOI：10.1016/j.mseb.2026.119310.png)
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Abstract
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The GdPrO3 photocatalyst was synthesized through sol-gel approach with gadolinium nitrate hexahydrate and praseodymium nitrate hexahydrate separately as gadolinium and praseodymium sources, and ethylenediaminetetraacetic acid as the auxiliary solvent. The prepared samples were characterized by scanning electron microscope (SEM), X-ray powder diffractometer (XRD), thermogravimetric analysis and differential scanning calorimetry (TG-DSC), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), electron spin resonance spectroscopy (ESR) and electrochemical workstation. Herein, methyl orange (MO) was utilized as pollutant model in simulated sewage to explore the photocatalytic efficacy of GdPrO3 under diverse synthesis temperatures and illumination times. Also, the cycling and recovery experiments were performed on so-obtained sample to test its stability. In addition, an in-depth exploration was carried out to elucidate the underlying photocatalytic mechanism. It was found that GdPrO3 prepared at different calcination temperatures could exhibit different photocatalytic performance. The one calcinated at 650 degrees C could exhibit the best photocatalytic performance, with the degradation efficiency of 88.23% within 90 min under simulated sunlight. Moreover, post-five-cycle testing, the material's stability efficiency of optimal GdPrO3 still remained as high as 80.43%, and the elemental composition and phase structure after reaction had hardly changed, indicating superior stability. Crucially, it was found that photogenerated holes (h(+)) and superoxide (O-center dot(2)-) radicals played a major role in MO degradation among produced reactive radicals over GdPrO3 under simulated sunlight. These research findings clearly indicated that newly-synthesized GdPrO3 photocatalyst demonstrated considerable potential for practical applications in environmental remediation.
Keywords:
Sol-gel method
Photocatalysis
Simulated sunlight
Methyl orange
GdPrO3
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