Abstract:Elemental mercury (Hg) and chlorinated volatile organic compounds (CVOCs), which arehighly toxic, exhibit significant migration and transformation capabilities, making them prone toforming various secondary pollutants in the atmosphere. This poses severe threats to human andenvironmental health, attracting widespread global attention. Despite numerous studies, controllingmercury and CVOCs in industrial flue gas remains a significant research challenge. Notably, there arefew reports on the impact of CVOCs on the low-temperature adsorption of Hg. This study investigatedthe low-temperature adsorption performance of various common adsorbents for Hg, specificallyassessing the effect of CVOCs using chlorobenzene as a model compound. We prepared three types ofmaterials: activated carbon and its modified materials, sulfide, and metal oxides, and evaluated their Hgadsorption activity at low temperature (80−120 ℃). The adsorption performance was ranked as follows:CuS/AC>CuS>MnO>AC>HCl/AC. Brunauer-Emmett-Teller (BET) analysis indicated no directrelationship between the specific surface area or pore type of the adsorbents and their Hg adsorptionperformance. In contrast, X-ray photoelectron spectroscopy (XPS) results revealed that oxidizingspecies such as , , and in CuS and MnO served as the primary active sites for thechemisorption of Hg. After adding chlorobenzene, the adsorption performance of CuS/AC and ACremained unchanged, while the other three materials exhibited inhibited performance, particularlyMnO, whose adsorption efficiency decreased by over 50%. Hg temperature-programmed desorption(TPD) experiments demonstrated that HgS was the predominant form of mercury in CuS/AC and CuSwhen only mercury was present in the flue gas. In MnO, HgO was the primary form, accompanied bysome physically adsorbed mercury, whereas AC only facilitated physical adsorption of Hg. In HCl/AC,both HgCl and physically adsorbed Hg were detected. Following the addition of CVOCs, the mainform of mercury in CuS remained HgS, while physically adsorbed mercury appeared in CuS/AC.Additionally, MnO exhibited a new adsorption component, HgCl. Kinetic analyses indicated that theadsorption process of Hg across different adsorbent materials conformed to a pseudo-first-order kineticmodel (R>0.99), highlighting the dominant role of external diffusion. The presence of chlorobenzenefurther enhanced the chemisorption of Hg by HCl/AC and MnO. Moreover, the Hg adsorptioncapacities of AC, HCl/AC, CuS, and MnO decreased significantly in the presence of chlorobenzene,dropping from 842.5, 573.4, 55 505.6, and 3 352.6 μg/g to 730.3, 181.7, 5 504.1, and 434.0 μg/g,respectively. By exploring the effects of CVOCs on the adsorption of Hg, this study contributes valua-ble insights for future research on low-temperature co-adsorption methods involving Hg and CVOCs. Close-