Enhancement of nitrate adsorption from aqueous solutions by glucose-derived nitrogen-doped carbonaceous adsorbent

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-03-23 DOI:10.1016/j.jaap.2025.107100

Jing Wang , Yoshimasa Amano , Motoi Machida

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引用次数: 0

Abstract

Developing effective nitrate removal methods is crucial for addressing water pollution. A nitrogen-doped glucose-derived carbonaceous adsorbent (UrGlu-4.5Z0.6–2nd) was prepared to enhance nitrate adsorption from wastewater. The optimization process of the adsorbent revealed the interaction principles among the raw materials, wherein the special brown porous foam-like intermediate formed after pre-treatment plays a decisive role in enhancing the adsorption performance of the adsorbent. UrGlu-4.5Z0.6–2nd exhibited a point of zero charge (pH_pzc) at the pH of 3.0 and a specific surface area (S_BET) of 6.13 m²/g. It was shown that the nitrogen-doped modified adsorbent exhibited a considerable capacity for adsorbing nitrate over a wide pH range of 2.0–10.0. The Langmuir isotherm model and the pseudo-second-order kinetic model can accurately describe the nitrate adsorption process of UrGlu-4.5Z0.6–2nd, and the maximum adsorption capacity (X_m) predicted by the Langmuir isotherm model was 1.18 mmol/g. Additionally, UrGlu-4.5Z0.6–2nd demonstrated an excellent adsorption capacity in practical applications using a fixed-bed column adsorption mode, with a breakthrough time of 136 min. It still exhibited preferential adsorption of nitrate in the coexisting ions solution. The results of nitrate adsorption studies and surface characterization indicate that the introduction of active quaternary nitrogen (N-Q) adsorption sites after nitrogen-doped is the primary mechanism for enhancing the adsorption capacity of nitrate.

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葡萄糖衍生的氮掺杂碳质吸附剂增强水溶液中硝酸盐的吸附

开发有效的硝酸盐去除方法是解决水污染的关键。制备了一种氮掺杂葡萄糖源碳质吸附剂（UrGlu-4.5Z0.6-2nd），以增强废水中硝酸盐的吸附能力。吸附剂的优化过程揭示了原料之间的相互作用原理，其中预处理后形成的特殊棕色多孔泡沫状中间体对提高吸附剂的吸附性能起着决定性的作用。urglu -4.5 z0.6 - 2在pH为3.0时具有零电荷点（pHpzc），比表面积（SBET）为6.13 m²/g。结果表明，在2.0 ~ 10.0的较宽pH范围内，氮掺杂改性吸附剂对硝酸盐具有较好的吸附能力。Langmuir等温线模型和拟二级动力学模型能较准确地描述urglu -4.5 z0.6 - 2的硝酸盐吸附过程，Langmuir等温线模型预测的最大吸附容量（Xm）为1.18 mmol/g。此外，urglu -4.5 z0.6 - 2在固定床柱吸附模式下的实际应用中表现出优异的吸附能力，突破时间为136 min。在共存离子溶液中仍表现出对硝酸盐的优先吸附。硝酸盐吸附研究和表面表征结果表明，氮掺杂后引入活性季氮（N-Q）吸附位点是提高硝酸盐吸附能力的主要机制。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.