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<p>To address the low utilization efficiency of conventional fertilizers, layered double oxide-silica composites (ch-LDO@Si) were prepared for reducing nutrient loss. Chrysotile as a cheap raw material is rich in magnesium and silicon which are of great value for crop growth. Therefore, chrysotile-derived ch-LDO@Si was prepared via a simple synthetic method for improving nutrients utilization efficiency. ch-LDO@Si exhibited adsorption capacities of 10.34&#xa0;mg/g for nitrate, 162.44&#xa0;mg/g for selenite, and 56.94&#xa0;mg/g for phosphate with anion exchange primarily governing nitrate and phosphate adsorption, while ligand exchange and hydrogen bonding predominantly mediated selenite adsorption. In static water, the nutrient release behavior from ch-LDO@Si conformed to Fickian diffusion, with cumulative release rates of 77.88% nitrate within 96&#xa0;h, 67.62% selenite within 72&#xa0;h, and 48.22% phosphate within 120&#xa0;h. Pot trials demonstrated that ch-LDO@Si-based fertilizer significantly promoted leaf growth by 31.7% and enhanced plant uptake of nitrogen (15.9%) and selenium (47.0%) relative to conventional fertilizers. This study presents a novel and sustainable strategy for the development of slow-release fertilizers, demonstrating that ch-LDO@Si as a candidate for efficient nutrient management.</p>

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Preparation of Layered Double Oxide-Silica Composites from Chrysotile for Different Anion Adsorption as Potential Slow-Release Fertilizers

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Aihua Xiang,
  • Xinglan Li,
  • Yifan Li,
  • Zeyu Wei,
  • Kun Liu

摘要

To address the low utilization efficiency of conventional fertilizers, layered double oxide-silica composites (ch-LDO@Si) were prepared for reducing nutrient loss. Chrysotile as a cheap raw material is rich in magnesium and silicon which are of great value for crop growth. Therefore, chrysotile-derived ch-LDO@Si was prepared via a simple synthetic method for improving nutrients utilization efficiency. ch-LDO@Si exhibited adsorption capacities of 10.34 mg/g for nitrate, 162.44 mg/g for selenite, and 56.94 mg/g for phosphate with anion exchange primarily governing nitrate and phosphate adsorption, while ligand exchange and hydrogen bonding predominantly mediated selenite adsorption. In static water, the nutrient release behavior from ch-LDO@Si conformed to Fickian diffusion, with cumulative release rates of 77.88% nitrate within 96 h, 67.62% selenite within 72 h, and 48.22% phosphate within 120 h. Pot trials demonstrated that ch-LDO@Si-based fertilizer significantly promoted leaf growth by 31.7% and enhanced plant uptake of nitrogen (15.9%) and selenium (47.0%) relative to conventional fertilizers. This study presents a novel and sustainable strategy for the development of slow-release fertilizers, demonstrating that ch-LDO@Si as a candidate for efficient nutrient management.