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Enhancing soil organic carbon fixation with modified bentonite composites

文献类型: 外文期刊

作者: Liu, Bing 1 ; Shen, Yuwen 1 ; Tan, Deshui 1 ; Cheng, Bohan 1 ; Lin, Haitao 1 ; Xue, Rui 1 ; Li, Zongxin 2 ; Yao, Qiang 1 ; Jiao, Shuying 3 ;

作者机构: 1.Shandong Acad Agr Sci, Inst Agr Resources & Environm, State Key Lab Nut Use & Management, Key Lab Wastes Matrix Utilizat,Minist Agr, Jinan 250100, Peoples R China

2.Shandong Acad Agr Sci, State Key Lab Nutrient Use & Management, Jinan 250100, Peoples R China

3.Shandong Agr Univ, Coll Resources & Environm, Tai An 271018, Peoples R China

关键词: Bentonite; Organic carbon fixation; Fulvic acid

期刊名称:APPLIED CLAY SCIENCE ( 影响因子:5.8; 五年影响因子:5.4 )

ISSN: 0169-1317

年卷期: 2025 年 273 卷

页码:

收录情况: SCI

摘要: 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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