[Effect of Ca Modified Biochar on the Chemical Speciation of Soil Phosphorus and Its Stabilization Mechanism].
Huan Jing Ke Xue
; 45(2): 983-991, 2024 Feb 08.
Article
en Zh
| MEDLINE
| ID: mdl-38471936
ABSTRACT
To control of phosphorus release from soil after farmland inundation around the lake and reservoirï¼ calcium modified biochar ï¼Ca-BCï¼ was prepared using the coprecipitation method. Through X-ray photoelectron spectroscopy ï¼XPSï¼ï¼ X-ray polycrystalline powder diffraction ï¼XRDï¼ï¼ adsorption experimentsï¼ and simulated culture experimentsï¼ the effects of Ca-based biochar on the fraction of soil phosphorus ï¼Pï¼ and its stabilization mechanism were studied. The results showed that the adsorption process of Ca-based modified biochar conformed to Langmuir ï¼R2 = 0.940ï¼ and the first-order adsorption kinetic model ï¼R2 = 0.961ï¼ï¼ indicating that the P adsorption was a single-layer adsorption dominated by chemical actionï¼ and the maximum adsorption capacity was 267.93 mg·g-1. The simulated culture experiment indicated that when the modified biochar was 1%ï¼ the exchangeable fraction of phosphorus in the soil decreased from 7.42% to 4.59%. The XRD results demonstrated that Ca3ï¼PO4ï¼2 and hydroxyapatite absorption peaks appeared after adsorbed phosphorus on biocharï¼ which proved that phosphate formed a relatively stable crystal precipitation. As shown in the XPS spectrum analysisï¼ the carbonyl functional groups participated in the phosphorus fixation processï¼ which improved the adsorption capacity of biochar for phosphorus. In generalï¼ when the concentration of Ca-based modified biochar was greater than 1%ï¼ it had a good fixation capacity for phosphorus release and had potential application value for controlling phosphorus release in soil.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
Zh
Revista:
Huan Jing Ke Xue
Año:
2024
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
China