A novel adsorbent by immobilizing tannic acid (TA) on graphene oxide (GO) was proposed and used to remove Hg 2+ from desulfurization wastewater. The morphology and physic-chemical property of tanninimmobilized graphene oxide (TAIGO) was characterized by Scanning electron microscopy (SEM), Atomic Force Microscope (AFM), and Fourier transform infrared spectroscopy (FTIR). The characterization results showed that the TA was immobilized on the GO successfully, and new functional groups were introduced on TAIGO. The effect of contact time, adsorbent dose, pH, and ion components on removal e ciency were evaluated. It was found that the adsorption process would complete within 15 min, and a higher removal e ciency could be obtained on the increased adsorbent dosage. The pH value would affect the protonation process of TAIGO and the form of Hg 2+ in the wastewater. The high-concertation Cland SO 3 2would hinder the absorption performance, while SO 4 2and cations had a negligible impact.Besides, an excellent economic bene t of TAIGO was achieved in the regeneration performance evaluation experiment, and removal e ciency of was 88% remained after three recycles. Most importantly, the TAIGO exhibited a better adsorption performance and economic bene t than GO and TA.The adsorption process was tted with the pseudo-second-order kinetic model(R=0.9995), and the adsorption of TAIGO for Hg 2+ was mainly relies on the functional groups on GO and the chelation reaction between TA and Hg 2+ . These facts indicated that the TAIGO was a low-cost and high removal ofHg 2+ e ciency adsorbent, which could be further used in the practical desulfurization wastewater.