共价有机框架修饰的生物炭在水溶液中增强了对镉的吸附。

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Toxics Pub Date : 2024-09-30 DOI:10.3390/toxics12100717
Yanwei Hou, Shanna Lin, Jiajun Fan, Youchi Zhang, Guohua Jing, Chao Cai
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引用次数: 0

摘要

在环境领域,新型高效重金属吸附材料一直是研究重点。本研究通过原位聚合法制备了一种新型复合材料--共价有机框架改性生物炭(RH-COF)。通过元素分析、BET 分析、扫描电镜、傅立叶变换红外光谱和 XPS 对 COF 改性生物炭进行了表征。改性材料中的氮和氧含量分别从 0.96% 和 15.50% 显著增加到 5.40% 和 24.08%,表明 RH-COF 表面添加了大量含氮和含氧官能团,从而使其对镉的吸附能力从 4.20 mg g-1 提高到 58.62 mg g-1,增加了约 14 倍。伪二阶模型和 Langmuir 模型都适用于描述 Cd2+ 在 RH-COF 上的吸附动力学和等温线。RH-COF 对 Cd2+ 的吸附性能对 4.0 至 8.0 之间 pH 值的敏感性很小,但受离子强度的影响较小。机理分析表明,RH-COF 对 Cd2+ 的吸附主要是表面络合和螯合作用,同时还有静电吸附、表面沉淀和 Cπ- 阳离子相互作用。总之,这些研究结果表明,COF-生物炭复合材料的合成可作为一种前景广阔的修复策略,同时也为 COF 在环境材料中的应用提供了科学依据。
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Enhanced Adsorption of Cadmium by a Covalent Organic Framework-Modified Biochar in Aqueous Solution.

In the environmental field, the advancement of new high-efficiency heavy metal adsorption materials remains a continuous research focus. A novel composite, covalent organic framework-modified biochar (RH-COF), was fabricated via an in-situ polymerization approach in this study. The COF-modified biochar was characterized by elemental analysis, BET analysis, SEM, FT-IR, and XPS. The nitrogen and oxygen content in the modified material increased significantly from 0.96% and 15.50% to 5.40% and 24.08%, respectively, indicating the addition of a substantial number of nitrogen- and oxygen-containing functional groups to the RH-COF surface, thereby enhancing its adsorption capacity for Cd from 4.20 mg g-1 to 58.62 mg g-1, representing an approximately fourteen-fold increase. Both the pseudo-second-order model and the Langmuir model were suitable for describing the kinetics and isotherms of Cd2+ adsorption onto RH-COF. The adsorption performance of Cd2+ by RH-COF showed minimal sensitivity to pH values between 4.0 and 8.0, but could be slightly influenced by ionic strength. Mechanistic analysis showed that the Cd2+ adsorption on RH-COF was dominated by surface complexation and chelation, alongside electrostatic adsorption, surface precipitation, and Cπ-cation interactions. Overall, these findings suggest that the synthesis of COF-biochar composite may serve as a promising remediation strategy while providing scientific support for applying COF in environmental materials.

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来源期刊
Toxics
Toxics Chemical Engineering-Chemical Health and Safety
CiteScore
4.50
自引率
10.90%
发文量
681
审稿时长
6 weeks
期刊介绍: The Journal accepts papers describing work that furthers our understanding of the exposure, effects, and risks of chemicals and materials in humans and the natural environment as well as approaches to assess and/or manage the toxicological and ecotoxicological risks of chemicals and materials. The journal covers a wide range of toxic substances, including metals, pesticides, pharmaceuticals, biocides, nanomaterials, and polymers such as micro- and mesoplastics. Toxics accepts papers covering: The occurrence, transport, and fate of chemicals and materials in different systems (e.g., food, air, water, soil); Exposure of humans and the environment to toxic chemicals and materials as well as modelling and experimental approaches for characterizing the exposure in, e.g., water, air, soil, food, and consumer products; Uptake, metabolism, and effects of chemicals and materials in a wide range of systems including in-vitro toxicological assays, aquatic and terrestrial organisms and ecosystems, model mammalian systems, and humans; Approaches to assess the risks of chemicals and materials to humans and the environment; Methodologies to eliminate or reduce the exposure of humans and the environment to toxic chemicals and materials.
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