新型Fe-Mn改性自氮生物炭复合材料：增强水生系统中Cr（VI）去除的协同吸附-还原机制

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-05-24 DOI:10.1016/j.seppur.2025.133703

Li Zhang , Yuwei Tang , Yuting Zhang , Weibin Sun , Zihao Yang , Jinchunzi Li , Shuang Liang , Jing Zhou

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引用次数: 0

摘要

本研究以芒果核多酚为绿色还原剂，从酱油渣（SSR）中合成了一种新型Fe-Mn双金属改性生物炭，系统研究了其去除水中六价铬（Cr(VI)）的性能和机理。通过扫描电子显微镜-能量色散x射线能谱（SEM-EDS）、x射线光电子能谱（XPS）、x射线衍射仪（XRD）、布鲁诺尔-埃米特-泰勒（BET）和傅里叶变换红外光谱（FT-IR）的综合表征，证实了Fe-Mn氧化物的成功加载，并优化了表面功能。批量实验结果表明，在pH为2.0、Fe/Mn摩尔比为1:2的条件下，复合材料对Cr（VI）的去除率最高，在120 min内达到99.96 %。颗粒内扩散模型和伪二阶动力学模型更准确地描述了Cr（VI）的去除机理。该吸附剂对常见阳离子（Na+、K+、Ca2+、Mg2+）和低浓度阴离子（CO32−、SO42−）具有较强的抗干扰能力。Fe/Mn-SRB0.5表现出优异的操作稳定性和可重复使用性，经过5个实验循环后，Cr（VI）的去除率保持在94.32 %。mn介导的Cr（VI）还原通过直接电子转移或fe协同还原进行。静电吸引、多组分氧化还原反应和络合作用共同控制Cr（VI）的去除。本研究制备了一种高效、稳定、可重复使用的功能化复合材料，在改善Cr（VI）污染环境方面具有很大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Novel Fe-Mn modified self-nitrogen biochar composite: Synergistic adsorption-reduction mechanisms for enhanced Cr(VI) removal in aquatic systems

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Novel Fe-Mn modified self-nitrogen biochar composite: Synergistic adsorption-reduction mechanisms for enhanced Cr(VI) removal in aquatic systems

This study employed mango kernel polyphenols as green reductants to synthesize a novel Fe-Mn bimetallic-modified biochar derived from soy sauce residue (SSR), systematically investigating its performance and mechanisms for aqueous hexavalent chromium (Cr(VI)) removal. Comprehensive characterization through scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD), Brunauer-Emmett-Teller (BET), and Fourier transform infrared spectroscopy (FT-IR) confirmed the successful loading of Fe-Mn oxides with optimized surface functionality. Batch experiments revealed maximum Cr(VI) removal efficiency (99.96 % within 120 min) at pH 2.0 using the composite with Fe/Mn molar ratio of 1:2. The intra-particle diffusion model and the pseudo-second order (PSO) kinetic model provided a more accurate description of Cr(VI) removal mechanism. The adsorbent demonstrated strong interference resistance against common cations (Na⁺, K⁺, Ca²⁺, Mg²⁺) and low-concentration anions (CO₃²⁻, SO₄²⁻). Fe/Mn-SRB0.5 exhibited excellent operational stability and reusability, retaining 94.32 % of Cr(VI) removal efficiency after five experimental cycles. Mn-mediated Cr(VI) reduction proceeded through direct electron transfer or Fe-synergized reduction. Electrostatic attraction, multi-components redox reactions, and complexation collectively governed Cr(VI) removal. This study prepared a functionalized composite with high efficiency, stability, and sustained reusability that possessed promising potential in improving Cr(VI) polluted environment.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.