Scholarlink

<p>Soil contamination with heavy metals poses serious risks to ecosystems and human health. Developing efficient and eco-friendly remediation technologies is critical for sustainable agriculture. This study evaluated a green soil amendment, silica-Fe (hydr)oxides composite (Si@Fe), for remediating arsenic (As) and antimony (Sb) contaminated soils, with emphasis on soil properties, rice growth, and microbial community responses. Field experiments were carried out around an abandoned Sb mine in Hunan Province, China. Soil parameters, enzyme activities, rice performance, and rhizosphere microbial communities were analyzed. High-throughput sequencing assessed microbial shifts, and grey relational analysis was used to evaluate links between soil factors and rice biomass. Application of Si@Fe reduced available As and Sb concentrations by 89.16 ± 2.34% and 73.79 ± 1.87%, respectively. Soil urease, sucrase (S_SC), and cellulase (S_CL) activities increased by 2.23-, 1.11-, and 1.37-fold compared with the CK. Rice plant height increased from 87.53 ± 6.84&#xa0;cm to 98.12 ± 9.36&#xa0;cm (<i>p</i> &lt; 0.05), while grain As content was maintained at 0.28 ± 0.03&#xa0;mg/kg, below the Chinese safety threshold (≤ 0.35&#xa0;mg/kg). Antioxidant enzyme activities decreased by 2–4.5 fold, relieving oxidative stress. Microbial analysis showed enrichment of beneficial taxa such as <i>Devosia</i> and <i>Mesorhizobium</i>. GRA identified strong correlations between S_SC, pH, bacterial alpha diversity, NO<sub>3</sub>-N, S_CL, and AK with rice biomass. In conclusion, Si@Fe effectively immobilized As and Sb, improved soil enzyme activity, promoted rice growth, and fostered beneficial microbial communities. Long-term monitoring is required to assess environmental persistence and ecological trade-offs.</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

Immobilization of arsenic and antimony by silica-Fe (hydr)oxides composite: investigation of potential ecological effects on the soil microbial environment

  • 期刊论文

  • 发表日期：

    2025年11月5日

查看全文
  • Rui Xu,
  • Yaxin Tian,
  • Qian Li,
  • Guangfei Qu,
  • Lang Liao,
  • Zhe Yin,
  • Zhenguo Wu,
  • Yuqi Han,
  • Yan Zhang,
  • Yongbin Yang,
  • Dongbin Liu,
  • Haiyan Yan,
  • Deliang Xu,
  • Tao Jiang

摘要

Soil contamination with heavy metals poses serious risks to ecosystems and human health. Developing efficient and eco-friendly remediation technologies is critical for sustainable agriculture. This study evaluated a green soil amendment, silica-Fe (hydr)oxides composite (Si@Fe), for remediating arsenic (As) and antimony (Sb) contaminated soils, with emphasis on soil properties, rice growth, and microbial community responses. Field experiments were carried out around an abandoned Sb mine in Hunan Province, China. Soil parameters, enzyme activities, rice performance, and rhizosphere microbial communities were analyzed. High-throughput sequencing assessed microbial shifts, and grey relational analysis was used to evaluate links between soil factors and rice biomass. Application of Si@Fe reduced available As and Sb concentrations by 89.16 ± 2.34% and 73.79 ± 1.87%, respectively. Soil urease, sucrase (S_SC), and cellulase (S_CL) activities increased by 2.23-, 1.11-, and 1.37-fold compared with the CK. Rice plant height increased from 87.53 ± 6.84 cm to 98.12 ± 9.36 cm (p < 0.05), while grain As content was maintained at 0.28 ± 0.03 mg/kg, below the Chinese safety threshold (≤ 0.35 mg/kg). Antioxidant enzyme activities decreased by 2–4.5 fold, relieving oxidative stress. Microbial analysis showed enrichment of beneficial taxa such as Devosia and Mesorhizobium. GRA identified strong correlations between S_SC, pH, bacterial alpha diversity, NO3-N, S_CL, and AK with rice biomass. In conclusion, Si@Fe effectively immobilized As and Sb, improved soil enzyme activity, promoted rice growth, and fostered beneficial microbial communities. Long-term monitoring is required to assess environmental persistence and ecological trade-offs.