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<p>This study presents a green method for synthesizing submicron barium sulfate (BaSO<sub>4</sub>) by oxidizing barite black ash (BaS) with ozone, addressing the limitations of traditional methods that yield large, polydisperse particles. Thermodynamic analysis confirmed the reaction's spontaneity (ΔG&lt;0 below 62.8°C). XRD confirmed that the product was a single phase of orthorhombic BaSO<sub>4</sub>, while SEM revealed plate-like, columnar, or spherical morphologies dependent on synthesis conditions. Key parameters: ozone flow rate (3–7 L min<sup>−1</sup>), temperature (30–60°C), and BaS concentration (0.20–0.65 mol L<sup>−1</sup>) were optimized to control particle size. High ozone flow (7 L/min) and BaS concentration (0.65 mol L<sup>−1</sup>) increased supersaturation, promoting nucleation over growth, while low temperature (30°C) minimized ozone decomposition and ion diffusion. Under optimal conditions, BaSO<sub>4</sub> particles with an average size of 152 nm (range: 25–300 nm) were achieved. This process eliminates filtration/wastewater generation, offering a scalable, eco-friendly route for industrial submicron BaSO<sub>4</sub> production.</p>

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Green preparation of submicron barium sulfate: Particle size control study using barite black ash and ozone as raw materials

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Bin Yang,
  • Ruili Jing,
  • Zixuan Sun,
  • Meng Wang,
  • Dan Chen

摘要

This study presents a green method for synthesizing submicron barium sulfate (BaSO4) by oxidizing barite black ash (BaS) with ozone, addressing the limitations of traditional methods that yield large, polydisperse particles. Thermodynamic analysis confirmed the reaction's spontaneity (ΔG<0 below 62.8°C). XRD confirmed that the product was a single phase of orthorhombic BaSO4, while SEM revealed plate-like, columnar, or spherical morphologies dependent on synthesis conditions. Key parameters: ozone flow rate (3–7 L min−1), temperature (30–60°C), and BaS concentration (0.20–0.65 mol L−1) were optimized to control particle size. High ozone flow (7 L/min) and BaS concentration (0.65 mol L−1) increased supersaturation, promoting nucleation over growth, while low temperature (30°C) minimized ozone decomposition and ion diffusion. Under optimal conditions, BaSO4 particles with an average size of 152 nm (range: 25–300 nm) were achieved. This process eliminates filtration/wastewater generation, offering a scalable, eco-friendly route for industrial submicron BaSO4 production.