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Purpose <p>The impact of wet-dry cycling aged biochar (WDCABC) on antibiotic adsorption and leaching in porous media remains a crucial yet understudied area. The study focuses on three wet-dry cycling aging (WDCA) treatments: using ultrapure water, nano-silicon particles (nSiO<sub>2</sub>) and humic acid (HA). The research aims to clarify their effects on biochar aging and subsequent antibiotic interactions.</p> Methods <p>Sulfadimidine (SD) and florfenicol (FLO), two weakly hydrophobic antibiotics with potential groundwater contamination risks were selected as target contaminants. The study employed batch adsorption experiments, column experiments and Hydrus 1D modeling in saturated porous media to simulate real soil conditions. These methods were used to evaluate the effects of WDCABC on both pollutant adsorption capacity and antibiotic leaching through porous media.</p> Results <p>The WDCA enhanced the adsorption capacity of biochar, as indicated by an increase in the Freundlich adsorption constant (<i>K</i><sub><i>f</i></sub>) ranging from 4.20% to 53.61%. Organic-aged biochar (OBC) exhibited greater adsorption capacity for both SD and FLO, primarily due to the increase in oxygen-containing functional groups (-OH, C-O, and C = O). This enhancement emerged as a dominant factor in sustaining biochar adsorption capacity. Conversely, inorganic-aged biochar (IBC) demonstrated improved fluid permeability due to alterations in its pore structure. The WDCA process also substantially influenced antibiotic migration in porous media, significantly reducing leaching under high-flow conditions (<i>p</i> &lt; 0.05). These effects were found to depend on the aging process, the type of aged biochar, and the specific antibiotic properties.</p> Conclusions <p>This study demonstrates that WDCA enhances biochar's adsorption capabilities and modulates its capacity to impede antibiotic migration to groundwater, optimizing its effectiveness in environmental pollution control. These findings underscore the impact of WDCA on biochar properties and functionality, demonstrating its potential to substantially reduce antibiotic leaching.</p>

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Experimental and modeling insights into adsorption and leaching of sulfadiazine and florfenicol in saturated porous media: Role of multiple wet-dry cycling aged biochar

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Xinyu Liu,
  • He Yang,
  • Lei Zhang,
  • Liqiong Xia,
  • Wenjun Song,
  • Jianqiang Zhang,
  • Feng Ouyang

摘要

Purpose

The impact of wet-dry cycling aged biochar (WDCABC) on antibiotic adsorption and leaching in porous media remains a crucial yet understudied area. The study focuses on three wet-dry cycling aging (WDCA) treatments: using ultrapure water, nano-silicon particles (nSiO2) and humic acid (HA). The research aims to clarify their effects on biochar aging and subsequent antibiotic interactions.

Methods

Sulfadimidine (SD) and florfenicol (FLO), two weakly hydrophobic antibiotics with potential groundwater contamination risks were selected as target contaminants. The study employed batch adsorption experiments, column experiments and Hydrus 1D modeling in saturated porous media to simulate real soil conditions. These methods were used to evaluate the effects of WDCABC on both pollutant adsorption capacity and antibiotic leaching through porous media.

Results

The WDCA enhanced the adsorption capacity of biochar, as indicated by an increase in the Freundlich adsorption constant (Kf) ranging from 4.20% to 53.61%. Organic-aged biochar (OBC) exhibited greater adsorption capacity for both SD and FLO, primarily due to the increase in oxygen-containing functional groups (-OH, C-O, and C = O). This enhancement emerged as a dominant factor in sustaining biochar adsorption capacity. Conversely, inorganic-aged biochar (IBC) demonstrated improved fluid permeability due to alterations in its pore structure. The WDCA process also substantially influenced antibiotic migration in porous media, significantly reducing leaching under high-flow conditions (p < 0.05). These effects were found to depend on the aging process, the type of aged biochar, and the specific antibiotic properties.

Conclusions

This study demonstrates that WDCA enhances biochar's adsorption capabilities and modulates its capacity to impede antibiotic migration to groundwater, optimizing its effectiveness in environmental pollution control. These findings underscore the impact of WDCA on biochar properties and functionality, demonstrating its potential to substantially reduce antibiotic leaching.