Study on the effects of phosphoric acid-modified biochar on the adsorption behavior and bioavailability of oxytetracycline in saline-alkali soils
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View abstract on PubMed
Summary
This summary is machine-generated.Phosphate acid-modified biochar (PBC) effectively adsorbs oxytetracycline (OTC) in saline-alkaline soils, reducing its bioavailability. This dual action remediates contaminated soil and improves soil quality, mitigating environmental risks.
Area Of Science
- Environmental Science
- Soil Science
- Agricultural Chemistry
Background
- Antibiotic accumulation in saline-alkaline soils poses agricultural risks.
- Biochar amendment is a promising strategy for saline-alkaline land remediation.
- The specific effects of modified biochar on antibiotic adsorption mechanisms in these soils are not well understood.
Purpose Of The Study
- To investigate the adsorption mechanism and occurrence forms of oxytetracycline (OTC) in saline-alkaline soil amended with phosphate acid-modified biochar (PBC).
- To evaluate the impact of PBC on OTC bioavailability and soil physicochemical properties.
- To assess the potential of PBC for synergistic soil remediation and improvement.
Main Methods
- Adsorption experiments using OTC and saline-alkaline soil amended with 5% PBC.
- Kinetic and isotherm modeling (pseudo-second-order, Freundlich models) to determine adsorption mechanisms.
- Assessment of OTC bioavailability through soil property analysis (pH, salt content, organic matter) and statistical analysis.
Main Results
- PBC significantly enhanced OTC adsorption in saline-alkaline soil, reaching equilibrium within 24 hours.
- Adsorption followed pseudo-second-order kinetics and was best described by the Freundlich model, indicating chemical adsorption and multi-layer adsorption.
- PBC application effectively reduced OTC bioavailability by 11.56-25.23% (p < 0.05) and improved soil properties (lower pH, reduced salt, increased organic matter).
Conclusions
- Phosphate acid-modified biochar is effective in adsorbing OTC and reducing its bioavailability in saline-alkaline soils.
- PBC application offers a synergistic approach for remediating antibiotic-contaminated soils while simultaneously improving soil quality.
- This strategy effectively controls environmental risks associated with antibiotic residues in agricultural lands.
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