Enhancing soil organic carbon fixation with modified bentonite composites

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-04-29 DOI:10.1016/j.clay.2025.107837

Bing Liu , Yuwen Shen , Deshui Tan , Bohan Cheng , Haitao Lin , Rui Xue , Zongxin Li , Qiang Yao , Shuying Jiao

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引用次数: 0

Abstract

Modified bentonite composites (Fe-CTAB modified bentonite) were synthesized by intercalating cetyl trimethyl ammonium bromide (CTAB) into the interlayer spaces of raw bentonite, followed by the embedding of iron oxide. The structural and physicochemical characteristics of the modified bentonite were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and zeta potential measurements. Our findings indicated that the modified bentonite exhibited a larger interlayer distance due to the introduction of CTAB, and the surface charge transitioned from negative to positive. The adsorption capacity of the Fe-CTAB modified bentonite for fulvic acid (FA) in an aqueous solution reached 368.4 mg/g, which was an increase of 2150 % compared to raw bentonite. In soil incubation experiments, the soil organic carbon content exhibited a 32.2 % decline in the FA treatment relative to the Fe-CTAB modified bentonite with FA treatment. The higher soil organic carbon sequestration in the treatment combining FA with Fe-CTAB modified bentonite led to increased biomass of crops.

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改性膨润土复合材料增强土壤有机碳固定作用

将十六烷基三甲基溴化铵（CTAB）嵌入原膨润土的层间空间，再包埋氧化铁，合成改性膨润土复合材料（Fe-CTAB改性膨润土）。采用扫描电镜（SEM）、傅里叶变换红外光谱（FT-IR）、x射线粉末衍射（XRD）、热重分析（TGA）和zeta电位测量对改性膨润土的结构和物理化学特性进行了表征。研究结果表明，CTAB的引入使改性膨润土的层间距离增大，表面电荷由负向正转变。Fe-CTAB改性膨润土在水溶液中对黄腐酸的吸附量达到368.4 mg/g，比原膨润土提高了2150%。在土壤培养实验中，FA处理的土壤有机碳含量比FA处理的Fe-CTAB改性膨润土降低了32.2%。FA与Fe-CTAB改性膨润土组合处理的土壤有机碳固存量较高，导致作物生物量增加。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...