鼠李糖脂改性对棉花秸秆生物炭结构特性及盐胁迫下植物生长的影响

doi:10.11896/cldb.24110033

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Abstract To enhance the adsorption capacity and reactivity of cotton stalk biochar while ameliorating soil salinization, this study introduces a novel approach by modifying biochar with rhamnolipid. Structural and surface characteristics of the biochar before and after modification were syste-matically analyzed using advanced characterization techniques. Additionally, a saline soil cultivation experiment with peanuts was conducted to evaluate mitigation effects of rhamnolipid-modified biochar on salt stress. Results indicate that rhamnolipid-modified cotton stalk biochar exhibited a smoother surface and more compact structure. Porosity was significantly enhanced, with a notable reduction in surface particulate matter and a more distinct skeletal framework. BET analysis revealed an average pore diameter of 7.105 5 nm, representing a 21.86% increase, while the micropore area decreased by 51.30% compared to the original biochar, transitioning to a characteristic mesoporous structure. Furthermore, the modified biochar demonstrated enriched oxygen-containing functional groups and intensified diffraction peaks of oxygenated compounds. Enhanced peak intensities were observed for C-O-C bonds and C-O groups in carboxylic acids and alcohols. Nitrogen and oxygen contents increased significantly by 26.32% and 35.07%, respectively, relative to unmodified biochar. Conversely, carbon and silicon contents decreased by 21.67% and 14.00%, respectively, resulting in a 71.93% surge in the O/C ratio. This shift diminished aromaticity and aging degree while enhancing polarity and oxidation state. Application of modified biochar markedly alleviated soil salinity stress, reducing EC by 33.65%. Physiological improvements in peanuts included a 34.24% decrease in MDA, a 25.30% reduction in GSH, and a 52.83% increase in PRO content. These fin-dings provide a theoretical foundation for scalable modification of cotton stalk biochar and remediation of saline-alkali soils.

Key words： cotton straw rhamnolipid-modified biochar physicochemical properties saline soil

Published: 25 February 2026 Online: 2026-02-13

CLC number:

TQ424.1+4

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	Articles by authors
	JING Lingkun
	WANG Hongbo
	CAO Zhenxi
	ZHANG Lei
	LIANG Yakang
	WANG Xingpeng

Cite this article:

JING Lingkun,WANG Hongbo,CAO Zhenxi, et al. Effects of Rhamnolipid Modification on the Structural Characteristics of Cotton Stalk Biochar and Plant Growth Under Salt Stress[J]. Materials Reports, 2026, 40(4): 24110033-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24110033 OR https://www.mater-rep.com/EN/Y2026/V40/I4/24110033

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