Abstract This study investigates the potential of ZVI on Cd(II) contaminated soil remediation through laboratory experiment, mechanism study and field application. The results show that the dosage of ZVI, the initial concentration level and the reaction time have significant impacts on Cd(II) adsorption and about 88% of aqueous Cd(II) can be removed from soils. The ZVI is observed to promote the increase of Cd(II) residual fraction in Cd(II) contaminated soils according to the sequential extraction procedure (SEP) results. Regression of the laboratory experimental data based on the Langmuir isotherm equation shows the adsorption capacity can reach 34.7 mg/g. Such a high value is attributed to physical and chemical adsorption, which is proved by X-ray diffraction patterns (XRD), scanning electron microscope images (SEM), and Brunner-Emmet-Teller & Barret–Joyner–Halenda (BET-BJH) analysis. The field application shows that the ZVI can reduce the Cd(II) content in soils and brown rice by 51% and alleviate soil acidification, resulting in a 9.4% increase in rice yields.

中文翻译：

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零价铁修复Cd(II)污染土壤的潜力：从实验室实验、机理研究到现场应用

摘要 本研究通过室内实验、机理研究和现场应用研究了ZVI对Cd(II)污染土壤修复的潜力。结果表明，ZVI 的用量、初始浓度水平和反应时间对 Cd(II) 吸附有显着影响，可从土壤中去除约 88% 的 Cd(II) 水溶液。根据顺序提取程序 (SEP) 结果，观察到 ZVI 促进了 Cd(II) 污染土壤中 Cd(II) 残留分数的增加。基于Langmuir等温线方程的实验室实验数据回归表明吸附容量可达34.7 mg/g。如此高的值归因于物理和化学吸附，这可以通过 X 射线衍射图 (XRD)、扫描电子显微镜图像 (SEM)、和 Brunner-Emmet-Teller & Barret-Joyner-Halenda (BET-BJH) 分析。田间应用表明，ZVI 可使土壤和糙米中的 Cd(II) 含量降低 51%，缓解土壤酸化，使水稻产量增加 9.4%。