In a scenario where mercury emission regulations are becoming increasingly stringent, the use of regenerable sorbents is an attractive economic and ecological alternative for the elimination of gaseous mercury. This study attempts to develop cost-effective regenerable sorbents made up of carbon supports loaded with maghemite and evaluate their application for mercury capture in CO₂ enriched atmospheres. To achieve this goal, an activated carbon (AC) and a carbon foam (CF) were impregnated with different concentrations of an iron salt and then subjected to thermal treatment to obtain the maghemite oxide. The Hg removal capacity of the prepared sorbents was evaluated at a laboratory-scale at 80 °C under different gas atmospheres. It was found that the characteristics of the carbon support as well as the iron concentration influence the distribution and morphology of the deposited maghemite particles. The CF-derived sorbents exhibited a better Hg⁰ removal performance than the AC-derived sorbents due to the presence of areas with a high concentration of iron oxide particles on the carbon support, which led to stronger interactions between the Hg and sorbent. The adsorption mechanism seems to occur via an adsorption/oxidation process involving the oxygen lattice of the metal oxide. Consequently, the sorbents lose their Hg retention capacity as the lattice oxygen is consumed. However, the deactivation can be counteracted by adding O₂ to the gas stream to regenerate the sorbents. Carbon foams loaded with maghemite possess interesting properties which make them suitable for application at industrial scale. These include their low-cost, design versatility, and easy in-batch producibility. Hence, CF-derived sorbents are a versatile option for Hg capture in regenerable columns, capable of competing with the one-use sorbents, typically injected into flue gas.

在汞排放法规越来越严格的情况下，使用可再生吸附剂是消除气态汞的一种有吸引力的经济和生态选择。这项研究试图开发出具有成本效益的可再生吸附剂，该吸附剂由负载有磁赤铁矿的碳载体组成，并评估了其在CO _2中捕集汞的应用。丰富的气氛。为了实现该目的，将活性炭（AC）和碳泡沫（CF）浸渍有不同浓度的铁盐，然后进行热处理以获得磁赤铁矿。在实验室规模，80°C和不同气体气氛下，评估了制备的吸附剂的汞去除能力。发现碳载体的特性以及铁浓度影响沉积的磁赤铁矿颗粒的分布和形态。CF衍生的吸附剂表现出更好的Hg ⁰由于在碳载体上存在高浓度氧化铁颗粒的区域，因此与AC衍生的吸附剂相比，其去除性能更高，这导致Hg与吸附剂之间的相互作用更强。吸附机理似乎是通过涉及金属氧化物的氧晶格的吸附/氧化过程发生的。因此，随着晶格氧的消耗，吸附剂失去了对Hg的保留能力。但是，可以通过添加O ₂来抵消失活进入气流以再生吸附剂。装有磁赤铁矿的碳泡沫具有令人感兴趣的特性，使其适合于工业规模的应用。这些包括低成本，设计通用性和批生产容易性。因此，源自CF的吸附剂是在可再生色谱柱中捕获汞的通用选择，能够与通常注入烟道气中的一次性吸附剂竞争。