Scholarlink

Purpose <p>Cadmium (Cd) contamination and methane (CH<sub>4</sub>) emission in paddy soils pose critical global environmental challenges, necessitating effective co-remediation techniques. In this study, a ferrihydrite (Fh)-loaded biochar (BC) composite (Fh-BC) was developed to simultaneously address Cd contamination and CH<sub>4</sub> emission.</p> Materials and methods <p>Soil incubation experiment was conducted using 120 mL serum bottles filled with Cd-contaminated soil. Different soil amendments were applied at varying mass ratios: 0.5-5% BC, 0.1-1% Fh, physically mixed BC and Fh, and 0.5-5% Fh-BC. The treatments were subjected to anaerobic incubation for up to 90 days. Field pilot experiment was carried out in Cd contaminated soils and the following amendments were applied: BC at 11.4 t·ha<sup>− 1</sup> (equivalent to ~ 1%), Fh at 2.3 t·ha<sup>− 1</sup>, and Fh-BC at 11.4 t·ha<sup>− 1</sup>.</p> Results <p>In the soil incubation experiment, Fh-BC significantly increased soil pH while decreasing soil Eh, leading to an 85% (<i>p</i> &lt; 0.001) reduction of water-soluble Cd and a 29% (<i>p</i> = 0.007) decrease in exchangeable Cd. Meanwhile, Fh-BC enhanced soil organic carbon stabilization via increasing iron-bound organic matter by 33–54% (<i>p</i> &lt; 0.05) and reducing the abundance of methanogens by 72.5% (<i>p</i> = 0.011), resulting in a 90–99% suppression of CH<sub>4</sub> emission (<i>p</i> &lt; 0.001). In the field pilot experiment, Fh-BC achieved a 65.9% reduction of brown rice Cd content and a 30.9% decrease in soil dissolved organic carbon.</p> Conclusion <p>Fh-BC exhibits dual environmental benefits, not only ensuring food security by effectively immobilizing soil Cd, but also significantly reducing CH<sub>4</sub> emission by enhancing soil organic carbon stability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ferrihydrite-biochar composite for synergistic cadmium immobilization and CH4 emission mitigation in paddy soil

  • 期刊论文

  • 发表日期：

    2026年4月6日

查看全文
  • Hangkai Hu,
  • Muhammad Iqbal Zaman,
  • Saiyong Zhu,
  • Jie Hou,
  • Jiang Xu,
  • Kun Yang,
  • Daohui Lin

摘要

Purpose

Cadmium (Cd) contamination and methane (CH4) emission in paddy soils pose critical global environmental challenges, necessitating effective co-remediation techniques. In this study, a ferrihydrite (Fh)-loaded biochar (BC) composite (Fh-BC) was developed to simultaneously address Cd contamination and CH4 emission.

Materials and methods

Soil incubation experiment was conducted using 120 mL serum bottles filled with Cd-contaminated soil. Different soil amendments were applied at varying mass ratios: 0.5-5% BC, 0.1-1% Fh, physically mixed BC and Fh, and 0.5-5% Fh-BC. The treatments were subjected to anaerobic incubation for up to 90 days. Field pilot experiment was carried out in Cd contaminated soils and the following amendments were applied: BC at 11.4 t·ha− 1 (equivalent to ~ 1%), Fh at 2.3 t·ha− 1, and Fh-BC at 11.4 t·ha− 1.

Results

In the soil incubation experiment, Fh-BC significantly increased soil pH while decreasing soil Eh, leading to an 85% (p < 0.001) reduction of water-soluble Cd and a 29% (p = 0.007) decrease in exchangeable Cd. Meanwhile, Fh-BC enhanced soil organic carbon stabilization via increasing iron-bound organic matter by 33–54% (p < 0.05) and reducing the abundance of methanogens by 72.5% (p = 0.011), resulting in a 90–99% suppression of CH4 emission (p < 0.001). In the field pilot experiment, Fh-BC achieved a 65.9% reduction of brown rice Cd content and a 30.9% decrease in soil dissolved organic carbon.

Conclusion

Fh-BC exhibits dual environmental benefits, not only ensuring food security by effectively immobilizing soil Cd, but also significantly reducing CH4 emission by enhancing soil organic carbon stability.