Coal holds a significant position in China’s energy consumption structure. However, the release of Hg⁰ during coal combustion poses a serious threat to human health. Traditional activated carbon for Hg⁰ removal is expensive; finding efficient, inexpensive and renewable adsorbents for Hg⁰ removal has become a top priority. Rice husk gasification char (RHGC) is a solid waste generated by biomass gasification power generation, which, loaded with silver to remove Hg⁰, could achieve the purpose of waste treatment. This paper examines the Hg⁰ removal performance of silver-loaded rice husk gasification char (SRHGC) under different operating conditions through experimental analysis. This study employed quasi-first-order, quasi-second-order, and internal diffusion kinetics adsorption equations to model the amount of Hg⁰ removed by SRHGC at different temperatures, thereby inferring the reaction mechanism. The results indicate that Hg⁰ removal efficiency of SRHGC increased by about 80%. The Hg⁰ removal ability was directly related to silver load, and the amount of Hg⁰ removed by SRHGC did not a exhibit a simple inverse relationship with particle size. Additionally, the Hg⁰ removal efficiency of SRHGC declined with increasing adsorption temperature. The removal of Hg⁰ by SRHGC conformed to the quasi-second-order kinetic equation, with the adsorption rate constant decreasing as the temperature rose, consistent with experimental observations. This paper provides both experimental and theoretical references for future modification and optimization of RHGC for coal-fired flue gas treatment, and also offers valuable insights into Hg⁰ removal by carbon-based adsorbents.