In this study, nitrate mediated biotic zero-valent iron (Fe⁰) corrosion was employed to enhance cadmium (Cd) removal from groundwater. In comparison with a 17.5% Cd(II) removal treated with abiotic Fe⁰, a 3.9 times higher Cd(II) removal of 86.2% was recorded in the nitrate-mediated biotic Fe⁰ system. Solids phase characterization confirmed that biogenic minerals such as green rust and iron sulfide could be formed in the nitrate-amended biotic Fe⁰ system, offering large amount of adsorption sites for Cd(II) removal. The decrease of nitrate concentration and the competition with cathodic hydrogen for biological nitrate reduction by extra organic substance such as sodium acetate both showed significant inhibition on Cd(II) removal, further proving that hydrogenotrophic denitrification was the main mechanism for enhanced Cd(II) removal. Besides, a relatively high Cd(II) removal efficiency was observed over a pH range of 5–8, and it increased with declining pH values. These results demonstrated that the bio-amended iron corrosion technology coupled Fe⁰-assisted H₂ production with hydrogenotrophic denitrification exhibited excellent Cd(II) removal capacity, which enabled this technology a promising potential for Cd(II)-contaminated groundwater treatment and an alternative strategy for Cd(II) and nitrate co-contaminated groundwater remediation.

在这项研究中，硝酸盐介导的生物零价铁（Fe ⁰）腐蚀被用来增强从地下水中去除镉（Cd）的能力。与用非生物Fe ⁰处理的17.5％Cd（II）去除相比，在硝酸盐介导的生物Fe ⁰系统中记录的Cd（II）去除率为86.2％的3.9倍。固相表征证实，硝酸盐修饰的生物Fe ⁰可以形成绿锈和硫化铁等生物矿物。系统，为Cd（II）去除提供了大量吸附位点。硝酸盐浓度的下降以及与乙酸氢钠等额外有机物质的生物还原硝酸盐的竞争均显示出对Cd（II）去除的显着抑制作用，进一步证明了氢营养反硝化是提高Cd（II）去除的主要机理。 。此外，在5–8的pH范围内观察到相对较高的Cd（II）去除效率，并且随着pH值的降低而增加。这些结果表明，生物改性铁腐蚀技术结合了Fe ⁰辅助的H _2。 氢营养反硝化生产的产品具有出色的Cd（II）去除能力，这使该技术具有被Cd（II）污染的地下水处理的有希望的潜力以及Cd（II）和硝酸盐共污染的地下水修复的替代策略。