Efficient U(VI) removal by Ti3C2Tx nanosheets modified with sulfidated nano zero-valent iron: Batch experiments, mechanism, and biotoxicity assessment

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Liping Liang , Mengfan Zhou , Fenfen Xi , Chaoqi Bai , Shenghua Wang , Shuyun Luo , Jingqi Liu , Yangyang Hu , Yuxuan Zeng , Wangliang Yang , Baowei Hu
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引用次数: 0

Abstract

The MXenes, a new class of two-dimensional layered materials, have found extensive applications in water treatment for its excellent thermal stability, electrical conductivity, and excellent adsorption ability. Sulfidized nano zero-valent iron (S-nZVI) is a good reducing agent, however, the practical application of S-nZVI is currently restricted due to the tendency of nano materials to agglomerate. Herein, MXenes use as a support and in situ loading S-nZVI on it to prepare a new material (S-nZVI/Ti3C2Tx), and applied it to U(VI) removal in water treatment. The microscopic characterization proves that S-nZVI on Ti3C2Tx has good dispersion and effectively alleviates agglomeration. Batch experiments shown that S-nZVI/Ti3C2Tx has a very good effect on U(VI) removal, and the maximum adsorption capacity reaches 674.4 mg/g under the aerobic condition at pH=6.0. The pseudo-second-order kinetic model and the Langmuir isotherm model were found to be more appropriate for describing the adsorption behavior. This indicates that the removal process is a single molecular layer chemisorption. Moreover, the S-nZVI/Ti3C2Tx maintained a removal efficiency of over 85 % for U(VI) even after being reused five times, demonstrating its excellent reusability. It is worth noting that the material can remove 79.8% of 50 mg/L of U(VI) in simulated seawater, indicating that S-nZVI/Ti3C2Tx possessed an excellent uranium extraction performance from seawater. Experimental results and XPS analysis showed that U(VI) was removed by adsorption, reduction and co-precipitation. Moreover, S-nZVI/Ti3C2Tx was a low toxicity material to hyriopsis cumingii. Therefore, S-nZVI/Ti3C2Tx was expected to be a candidate as adsorbent with great potential in removal of uranium from wastewater and seawater.

Abstract Image

硫化纳米零价铁修饰的 Ti3C2Tx 纳米片高效去除铀(Ⅵ):批量实验、机理和生物毒性评估
纳米氧化物(MXenes)是一类新型的二维层状材料,因其出色的热稳定性、导电性和吸附能力,已在水处理领域得到广泛应用。硫化纳米零价铁(S-nZVI)是一种很好的还原剂,但由于纳米材料容易团聚,目前 S-nZVI 的实际应用受到限制。本文以 MXenes 为载体,原位负载 S-nZVI 制备了一种新材料(S-nZVI/Ti3C2Tx),并将其应用于水处理中的 U(VI)去除。显微表征证明,S-nZVI 在 Ti3C2Tx 上具有良好的分散性,能有效缓解团聚现象。批量实验表明,S-nZVI/Ti3C2Tx 对 U(VI)有很好的去除效果,在 pH=6.0 的有氧条件下,最大吸附容量达到 674.4 mg/g。研究发现,伪二阶动力学模型和 Langmuir 等温线模型更适合描述吸附行为。这表明去除过程是一个单分子层化学吸附过程。此外,即使重复使用五次,S-nZVI/Ti3C2Tx 对 U(VI)的去除率仍保持在 85% 以上,这表明它具有极佳的重复使用性。值得注意的是,该材料能去除模拟海水中 79.8% 的 50 mg/L 六氟化铀,表明 S-nZVI/Ti3C2Tx 具有优异的海水铀萃取性能。实验结果和 XPS 分析表明,U(VI) 是通过吸附、还原和共沉淀的方式被去除的。此外,S-nZVI/Ti3C2Tx 是一种对hyriopsis cumingii 低毒的材料。因此,S-nZVI/Ti3C2Tx有望成为一种候选吸附剂,在去除废水和海水中的铀方面具有巨大潜力。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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