Mercury is a potential contaminant of the aqueous systems that needs to be removed from wastewaters even in trace concentrations due to its hazardous effects on environment and human health. Agricultural and industrial wastes are produced in abundance in many agro-industrial activities and have no commercial costs associated with them. The Hg(II) ions can establish bonds with the functional groups present on lignocellulosic biomasses, making the use of these types of biosorbents excellent alternatives to remove mercury in water treatments, while promotes their recycling and valuation. In this work, six biosorbents (banana and potato peels, eggshells, Eucalyptus globulus bark, water hyacinth, and coffee waste) were tested and compared under the same batch conditions with an initial mercury concentration of 50 µg dm⁻³ in order to determine their removal performances. Several reaction- and diffusion-based models were adjusted to the experimental data to analyze the limiting sorption mechanisms. Sorption experiments and modelling results evidenced distinct affinities of those biosorbents to Hg(II), banana peels being the best alternative due to the fast removal kinetics and capacity. This biosorbent was able to remove more than 90 % of the Hg(II) initially in solution after 72 h of exposure, being more than 80 % removed in the first 10 h. Chemical and physical characteristics of the solids are involved in Hg(II) elimination, as reported by FTIR-ATR and SEM studies.

汞是水性系统的潜在污染物，由于其对环境和人类健康的有害影响，即使是痕量浓度的汞也需要从废水中去除。农业和工业废物在许多农业工业活动中大量产生，并且没有与之相关的商业成本。Hg(II) 离子可以与木质纤维素生物质上存在的官能团建立键合，使这些类型的生物吸附剂成为去除水处理中汞的绝佳替代品，同时促进其回收和评估。在这项工作中，六种生物吸附剂（香蕉和马铃薯皮、蛋壳、蓝桉树皮、水葫芦和咖啡废物）在相同批次条件下进行了测试和比较，初始汞浓度为 50 µg dm ^-3以确定它们的去除性能。根据实验数据调整了几个基于反应和扩散的模型，以分析限制吸附机制。吸附实验和建模结果证明这些生物吸附剂对 Hg(II) 具有明显的亲和力，香蕉皮是最佳替代品，因为它具有快速去除动力学和能力。这种生物吸附剂在暴露 72 小时后最初能够去除溶液中 90% 以上的 Hg(II)，在前 10 小时内去除了 80% 以上。根据 FTIR-ATR 和 SEM 研究报告，固体的化学和物理特性与 Hg(II) 的消除有关。