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<p>Malachite green dye poses a considerable risk to the environment and human safety owing to its toxic nature, prolonged retention in ecosystems, and tendency to bioaccumulate. Consequently, there is a pressing need to develop efficient adsorbents capable of removing this pollutant from contaminated water sources. In this study, novel SrCrO<sub>4</sub>/MgO/SrCO<sub>3</sub>/C (MS600) and Sr<sub>2</sub>CrO<sub>4</sub>/MgO/SrCrO<sub>4</sub>/C (MS800) products were generated via the Pechini sol–gel approach, employing calcination processed at 600&#xa0;°C and subsequently at 800&#xa0;°C. These materials exhibited distinctive structural characteristics and outstanding adsorption performance. X-ray diffraction verified the presence of well-defined crystalline phases, with MS600 and MS800 showing mean crystallite sizes of 60.26&#xa0;nm and 65.51&#xa0;nm, respectively. Energy-dispersive X-ray spectroscopy revealed that MS800 contained a higher proportion of metal elements, while MS600 exhibited increased residual carbon due to its lower calcination temperature. Field emission scanning electron microscopy indicated irregular surface morphologies with average grain sizes of 0.23&#xa0;µm for MS600 and 0.33&#xa0;µm for MS800. High-resolution transmission electron microscopy further affirmed average particle diameters of 18.40&#xa0;nm for MS600 and 35.19&#xa0;nm for MS800. Notably, the maximum adsorption capacities recorded were 285.71&#xa0;mg/g in the case of MS600 and 273.22&#xa0;mg/g in the case of MS800. The adsorption mechanism was characterized as physical, exothermic, and spontaneous, fitting the pseudo-first-order model and aligning well with the Langmuir isotherm.</p>

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Innovative synthesis of hybrid nanocomposites based on strontium chromate for malachite green dye removal from aqueous media

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • N. S. Al-Kadhi,
  • E. A. Abdelrahman,
  • R. K. Shah

摘要

Malachite green dye poses a considerable risk to the environment and human safety owing to its toxic nature, prolonged retention in ecosystems, and tendency to bioaccumulate. Consequently, there is a pressing need to develop efficient adsorbents capable of removing this pollutant from contaminated water sources. In this study, novel SrCrO4/MgO/SrCO3/C (MS600) and Sr2CrO4/MgO/SrCrO4/C (MS800) products were generated via the Pechini sol–gel approach, employing calcination processed at 600 °C and subsequently at 800 °C. These materials exhibited distinctive structural characteristics and outstanding adsorption performance. X-ray diffraction verified the presence of well-defined crystalline phases, with MS600 and MS800 showing mean crystallite sizes of 60.26 nm and 65.51 nm, respectively. Energy-dispersive X-ray spectroscopy revealed that MS800 contained a higher proportion of metal elements, while MS600 exhibited increased residual carbon due to its lower calcination temperature. Field emission scanning electron microscopy indicated irregular surface morphologies with average grain sizes of 0.23 µm for MS600 and 0.33 µm for MS800. High-resolution transmission electron microscopy further affirmed average particle diameters of 18.40 nm for MS600 and 35.19 nm for MS800. Notably, the maximum adsorption capacities recorded were 285.71 mg/g in the case of MS600 and 273.22 mg/g in the case of MS800. The adsorption mechanism was characterized as physical, exothermic, and spontaneous, fitting the pseudo-first-order model and aligning well with the Langmuir isotherm.