This work showcases cost-effective elemental mercury capture strategy enabled by bamboo saw dust and bromine flame retardant (BFR) derived sorbent prepared by a novel hydrothermal-pyrolysis method. The hydrothermal treatment of bamboo and BFR blend was conducted in subcritical water resulting in a hydrothermal char. Subsequently, the hydrothermal char was pyrolyzed in nitrogen atmosphere leading to an improved pore architecture. The resulting biomaterials were proven highly effective for Hg removal. A thorough analysis of the physicochemical properties of the samples was conducted by means of BET, SEM, XRD, XPS and FT-IR. Key parameters such as bamboo/BFR ratio, hydrothermal temperatures and pyrolysis temperatures influence Hg⁰ removal capacity of our bio-sorbents. Overall, the optimal bamboo/BFR ratio, hydrothermal temperature and pyrolysis temperature are 2:1, 320 °C and 800 °C, respectively. Under these optimized conditions, a very promising elemental mercury removal efficiency of 99% is attained. The kinetics and mechanism of Hg⁰ removal are also proposed. The experimental data fit well with a pseudo-second-order model, indicating that Hg⁰ adsorption over sorbents was dominated by chemisorption. Our results indicate that the C–Br groups in sorbents provide active sites for oxidizing Hg⁰ into HgBr₂.

这项工作展示了由竹锯屑和溴阻燃剂（BFR）衍生的吸附剂（采用新颖的水热解法制备）可实现具有成本效益的元素汞捕获策略。竹子和BFR混合物的水热处理是在亚临界水中进行的，产生了水热炭。随后，将水热炭在氮气氛中热解，从而改善了孔结构。事实证明，所得生物材料对除汞非常有效。通过BET，SEM，XRD，XPS和FT-IR对样品的理化性质进行了全面分析。竹/ BFR比，水热温度和热解温度等关键参数影响Hg ⁰我们的生物吸附剂的去除能力。总体而言，最佳竹/ BFR比，水热温度和热解温度分别为2：1、320°C和800°C。在这些优化条件下，获得了非常有希望的99％的除汞效率。还提出了去除Hg ⁰的动力学和机理。实验数据与拟二级模型很好地吻合，表明Hg ⁰在吸附剂上的吸附以化学吸附为主。我们的结果表明，吸附剂中的C–Br基团提供了将Hg ⁰氧化为HgBr _2的活性位点。