The rod-shaped Bi₂S₃ was successfully loaded on the g-C₃N₄ nanosheets by the hydrothermal method to effectively remove elemental mercury in the flue gas. In this work, the removal performances of elemental mercury (Hg⁰) in flue gas were explored in the case of different loading values, reaction temperatures, and different gas components, respectively. Experimental results indicated that the optimal loading value of Bi₂S₃ to g-C₃N₄ is 15% (BC-15). In addition, BC-15 had excellent Hg⁰ removal efficiency at 120–160 °C, which reached more than 80%. The simulated adsorption capacity of BC-15 for Hg⁰ under the condition of N₂ + 5% O₂ is 19.15 mg/g, which is superior compared with traditional activated carbon. It was found that BC-15 has good resistance to SO₂ and NO. X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD) analysis confirmed that sulfur had a high binding affinity to Hg⁰. Hg⁰ was first physically adsorbed on the surface of the adsorbent, and then the adsorbed mercury was combined with sulfur and fixed on the surface of the adsorbent in the form of stable HgS. This study highlights that Bi₂S₃/g-C₃N₄ is a promising mercury adsorbent.

中文翻译：

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片状氮化碳负载棒状 Bi2S3 有效去除烟气中的元素汞

通过水热法将棒状Bi ₂ S ₃成功负载在gC ₃ N ₄纳米片上，有效去除烟气中的元素汞。在这项工作中，分别探讨了在不同负载值、反应温度和不同气体组分情况下烟气中元素汞（Hg ⁰）的去除性能。实验结果表明，Bi ₂ S ₃对gC ₃ N ₄的最佳负载量为15%（BC-15）。此外，BC-15 具有优异的 Hg ⁰120～160℃时的去除效率达到80%以上。BC-15在N ₂ + 5% O ₂条件下对Hg ⁰的模拟吸附量为19.15 mg/g，优于传统活性炭。发现BC-15对SO ₂和NO具有良好的抗性。X 射线光电子能谱 (XPS) 和程序升温脱附 (TPD) 分析证实硫对 Hg ⁰具有高结合亲和力。Hg ⁰首先物理吸附在吸附剂表面，然后吸附的汞与硫结合并以稳定的HgS形式固定在吸附剂表面。本研究强调 Bi ₂ S₃ /gC ₃ N ₄是一种很有前途的汞吸附剂。