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In this study, a simple method combining sol-gel and impregnation techniques was employed to synthesize magnetic Cu/MnFe 2 O 4. The resulting material demonstrated outstanding efficiency in removing mercury, achieving over 90% at reaction temperatures ranging from 150 °C to 200 °C. Through Cu incorporation, the Hg0 removal performance of Cu 0.15 MnFe was significantly enhanced, leading to a high adsorption capacity of 70.1 mg/g. This surpasses the capabilities of many previously reported adsorbents and holds great potential for enhancing the stability of Hg recovery efficiency. Furthermore, the presence of O 2 , HCl, and NO further improved the Hg0 removal. Conversely, H 2 O had an mild inhibitory effect on Hg0 removal. Additionally, the introduction of Cu noticeably mitigated the inhibitory impact of SO 2 on mercury removal characteristics and alleviated the issue of SO 2 poisoning in adsorbents. The primary active sites responsible for the oxidation of elemental mercury are the redox reaction between Cu2+/Cu+ and Mn3+/Mn2+, and adsorbed oxygen species. Through the oxidation process, Hg0 is primarily converted into various compounds, including HgO, Hg(NO 3) 2 , HgCl 2 , and HgSO 4. As a result, the prepared magnetic recyclable adsorbent, with its high mercury adsorption capacity, exhibits promising prospects for industrial application in the low-temperature removal of Hg0 from coal-fired flue gas. [Display omitted] • Magnetic Cu/MnFe 2 O 4 adsorbent was prepared using a simple method. • Cu/MnFe 2 O 4 owned a large Hg adsorption capacity of 70.1 mg/g. • The introduction of Cu greatly alleviated SO 2 poisoning in adsorbents. • Cu2+, Mn3+ and O* play a crucial role as active sites for Hg0 oxidation. [ABSTRACT FROM AUTHOR]