Addressing Cd(II) and As(III) pollution in agricultural irrigation is crucial for ecological and public health protection. This study introduces a S–Fe–C composite (SFC) to improve Cd(II) and As(III) removal from irrigation water. Characterization showed homogeneous S-nZVI nanoflake distribution within BC, enhancing adsorption capacities to 405 mg g⁻¹ for Cd(II) and 349 mg g⁻¹ for As(III). The adsorption process adhered to pseudo-second order kinetics and the Langmuir isotherm. BC can prevent S-nZVI aggregation and enhance electron mobility. Ca²⁺ and Mg²⁺ reduced Cd(II) removal, whereas As(III) and PO₄³⁻ facilitated it. The efficacy of SFC stemmed from chemical precipitation, surface complexation, ion exchange, oxidation and Fe–Cd–As complex formation. Remarkably, SFC maintained its magnetic properties after five cycles, indicating its potential for recyclability. These results demonstrate the great potential of SFC as a functional material for simultaneous remediation of cadmium–arsenic contaminated irrigation water, which is critical for agricultural productivity and environmental health.

中文翻译：

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使用 S-Fe-C 复合材料高效去除灌溉水中的 Cd(II) 和 As(III)：性能和机制

解决农业灌溉中的镉( II )和砷( III )污染对于保护生态和公共卫生至关重要。本研究引入了 S-Fe-C 复合材料 (SFC)，以提高灌溉水中Cd( II ) 和 As( III ) 的去除率。表征表明，S-nZVI 纳米片均匀分布在 BC 内，将 Cd( II ) 的吸附能力提高到 405 mg g ^-1 ，对 As( III ) 的吸附能力提高到 349 mg g ^-1。吸附过程遵循准二级动力学和朗缪尔等温线。 BC可以防止S-nZVI聚集并增强电子迁移率。 Ca ²⁺和Mg ²⁺减少了Cd( II ) 的去除，而As( III ) 和PO ₄ ³⁻则促进了它。 SFC 的功效源于化学沉淀、表面络合、离子交换、氧化和 Fe-Cd-As 络合物的形成。值得注意的是，SFC 在五个循环后仍保持其磁性，表明其可回收利用的潜力。这些结果表明，SFC 作为同时修复镉砷污染灌溉水的功能材料具有巨大潜力，这对于农业生产力和环境健康至关重要。