Thermal tuning of nanocomposites for superior cadmium ion adsorption.

IF 3.8 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Scientific Reports Pub Date : 2025-07-05 DOI:10.1038/s41598-025-09274-7

Ehab A Abdelrahman, Mohamed N Goda, Abdalla M Khedr, Fawaz A Saad, Reem K Shah

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Abstract

Cadmium (Cd(II)) ions are hazardous, non-biodegradable pollutants known for their bioaccumulative nature and severe risks to human health and aquatic ecosystems. This study presents the synthesis and application of a Co_0.89Mg_0.79Mn_1.46O_3.98@C nanocomposite, fabricated employing the Pechini sol-gel approach and subsequently calcinated at 600 ^oC (C600) and 800 ^oC (C800), for enhanced elimination of Cd(II) ions from aqueous environments. The C600 and C800 samples exhibited maximum uptake capacities of 280.11 mg/g and 206.19 mg/g, respectively. X-ray diffraction (XRD) analysis confirmed a cubic structure for both samples, with crystallite sizes of 51.66 nm (C600) and 87.09 nm (C800). Field emission scanning electron microscopy (FE-SEM) analysis clarified that C600 consisted of smaller, irregular grains, while C800 displayed larger, smoother particles. Elemental composition was verified by energy-dispersive X-ray spectroscopy (EDX), revealing elevated manganese and cobalt content in C800, attributed to enhanced incorporation at elevated temperatures. The superior adsorption performance of C600 was ascribed to its reduced crystallite size in addition to greatest surface area. Regeneration studies demonstrated excellent desorption efficiencies using 3 M HCl: 99.69% for C600 and 99.35% for C800, with both maintaining high removal efficiency over five adsorption-desorption cycles. Thermodynamic assessments indicated the process is exothermic, spontaneous, and dominated by physisorption. Kinetic modeling followed the pseudo-second-order model, while isotherm analysis fit the Langmuir-type isotherm, suggesting single-layer adsorption occurring uniformly across the adsorbent surface.

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纳米复合材料对镉离子吸附性能的热调谐。

镉（Cd(II)）离子是一种危险的、不可生物降解的污染物，具有生物蓄积性，对人类健康和水生生态系统构成严重风险。本研究介绍了Co0.89Mg0.79Mn1.46O3.98@C纳米复合材料的合成和应用，该材料采用Pechini溶胶-凝胶法制备，随后在600℃（C600）和800℃（C800）下煅烧，以增强水环境中Cd（II）离子的去除。C600和C800样品的最大吸收能力分别为280.11 mg/g和206.19 mg/g。x射线衍射（XRD）分析证实两种样品均为立方结构，晶粒尺寸分别为51.66 nm （C600）和87.09 nm （C800）。场发射扫描电镜（FE-SEM）分析表明，C600由较小的不规则颗粒组成，而C800则由较大的光滑颗粒组成。通过能量色散x射线光谱（EDX）验证了元素组成，揭示了C800中锰和钴含量的升高，这是由于温度升高导致的。C600具有优异的吸附性能，主要是因为其比表面积大，晶粒尺寸小。再生研究表明，使用3 M HCl时，C600和C800的脱附效率分别为99.69%和99.35%，在5次吸附-脱附循环中均保持较高的去除效率。热力学评价表明该过程是放热的、自发的、以物理吸附为主的。动力学模型符合拟二阶模型，等温线分析符合langmuir型等温线，表明吸附剂表面均匀发生单层吸附。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scientific Reports Natural Science Disciplines-

CiteScore

7.50

自引率

4.30%

发文量

19567

审稿时长

3.9 months

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