Adsorption is an efficient and practical method to remove Hg⁰ from coal flue gas. Surface active oxygen of the sorbents can adsorb Hg⁰ forming HgO which becomes the essential factor for efficient Hg⁰ removal. In this study, Co₃O₄ nanotubes were embedded into the interlayer of GO nanosheets to prepare a composite material 3D. SEM and TEM results show that GO gives a high dispersion of Co₃O₄ nanotubes, which is beneficial to the adsorption and activation of O₂ on Co₃O₄ nanotubes surface. XPS results show that when the mass ratio of GO to Co₃O₄ was 1:2 (Go-Co₃O₄-1–2), the sorbent had the best O_β/O_T ratio and the best redox capacity. It means that the oxygen-containing functional groups on the GO surface can provide more active sites for the Co₃O₄ nanotubes to capture and activate O₂ into chemisorbed oxygen. Furthermore, GO has a fast electron transfer which can improve the electron shift in the reaction of Hg⁰ + O₂ → HgO. As a result, the Hg⁰ removal efficiency of GO-Co₃O₄-1–2 reached 94.67% under 180,000 h⁻¹ at 250 °C, and showed a good stability. The Hg⁰ removal mechanism and regeneration mechanism were deduced based on the XPS results of the fresh, used and regenerated sorbent.

吸附法是一种高效实用的脱除煤烟气中Hg ^{0的方法。}吸附剂的表面活性氧可以吸附Hg ^{0形成HgO，成为有效去除Hg 0}的必要因素。在这项研究中，将Co ₃ O ₄纳米管嵌入到GO纳米片的夹层中以制备复合材料3D。_{SEM和TEM结果表明，GO使Co 3} O ₄纳米管高度分散，有利于O ₂在Co ₃ O ₄纳米管表面的吸附和活化。_{XPS结果表明，当GO与Co 3} O ₄的质量比为1:2（Go-Co ₃ O ₄ -1–2）时，吸附剂具有最佳的O _β /O _T比和最佳的氧化还原容量。这意味着GO表面的含氧官能团可以为Co ₃ O ₄纳米管提供更多的活性位点以捕获和活化O ₂成为化学吸附的氧。^{此外，GO具有快速的电子转移，可以改善Hg 0}  + O ₂  → HgO反应中的电子转移。结果，GO-Co ₃ O ₄ -1–2的Hg ^{0去除效率在180,000 h -1下达到94.67%。}在 250 °C 时表现出良好的稳定性。基于新鲜、用过和再生吸附剂的 XPS 结果推导了Hg ^{0去除机理和再生机理。}