School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
School of Life Sciences, Central South University, Changsha 410083, China.
J Hazard Mater. 2021 Feb 15;404(Pt A):124035. doi: 10.1016/j.jhazmat.2020.124035. Epub 2020 Sep 28.
Efficient removal of Hg from aqueous solution is key for environmental protection and human health. Herein, a novel composite of nano humboldtine decorated almandine was synthesized from almandine for the removal of Hg. Results showed that the Hg removal process followed pseudo-second-order kinetic model and Langmuir equation, and the maximum adsorption capacity was 575.17 mg/g. Furthermore, Hg removal by the composite was pH-dependent and low pH value facilitated the removal of Hg. SEM and HADDF-STEM results suggested a new rod morphology was generated and the adsorbed mercury was mainly enriched into this structure after reaction with Hg solution. The removal mechanisms of Hg by the composite was pH dependent, and included ion exchange, surface complexation, reduction and oxidation. Our results demonstrated that the composite was an ideal material for Hg removal and the transformation ways of mercury related species could be a significant but currently underestimated pathway in natural and engineered systems.
从水溶液中高效去除汞对于环境保护和人类健康至关重要。本文从铁铝榴石出发，合成了一种新型的纳米纤铁矿修饰铁铝榴石复合材料，用于去除汞。结果表明，汞的去除过程遵循拟二级动力学模型和朗缪尔方程，最大吸附容量为 575.17mg/g。此外，该复合材料的汞去除过程受 pH 值影响，较低的 pH 值有利于汞的去除。SEM 和 HADDF-STEM 结果表明，反应后生成了一种新的棒状形貌，吸附的汞主要富集到这种结构中。该复合材料去除汞的机制与 pH 值有关，包括离子交换、表面络合、还原和氧化。我们的结果表明，该复合材料是一种去除汞的理想材料，汞相关物种的转化途径可能是自然和工程系统中一个重要但目前被低估的途径。
