Rice husk, as an abundant agricultural waste and renewable biomass, is adopted to produce porous silica which is used as a potential carbon-free adsorbent for mercury emission control of coal-fired power plants. The rice husk derived porous silica (RHS) exhibits a good Hg⁰ adsorption capability with Hg⁰ removal efficiency above 80% in the temperature range of 60–140 °C, which is plausibly due to the big specific surface area and mesoporous structure. The mercury removal performance of RHS can be evidently reinforced by KBr modification. The optimal KBr loading value and reaction temperature are 2 wt% and 140 °C, respectively. Acidic gas components, such as NO and SO₂, both show slight inhibitive effects on Hg⁰ adsorption process probably owing to the competitive adsorption or the elimination of adsorption sites.

稻壳作为一种丰富的农业废弃物和可再生生物质，可用于生产多孔二氧化硅，作为潜在的无碳吸附剂，用于控制燃煤电厂的汞排放。稻壳衍生的多孔二氧化硅（RHS）表现出良好的 Hg ⁰吸附能力，在 60-140 °C 的温度范围内，Hg ⁰去除效率超过 80%，这可能是由于大的比表面积和介孔结构。KBr改性可以明显增强RHS的除汞性能。最佳 KBr 负载值和反应温度分别为 2 wt% 和 140 °C。酸性气体成分，如 NO 和 SO ₂，均对 Hg ⁰显示出轻微的抑制作用 吸附过程可能是由于竞争吸附或吸附位点的消除。