期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 214, 期 -, 页码 54-66出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.06.061
关键词
Magnetic chitosan particles; Amino acids; Uranium; Adsorption
资金
- National Natural Science Foundation of China [22066001]
- Natural Science Foundation of Jiangxi Province of China [20212ACB213001]
In this study, amino acids-modified magnetic chitosan adsorbents were successfully used for the removal of uranium from wastewater, showing high adsorption capacity and efficient solid-liquid separation.
Exploiting eco-friendly, highly controlled preparation and convenient solid-liquid separation adsorbent to separate uranium from aquatic medium is of importance and in demand. In this study, magnetic ferroferric oxide nanoparticles synthesized through a facile hydrothermal reaction was cross-linked with chitosan. The intermediate product was subsequently chemically grafting with four amino acids such as alanine, serine, glycine or L-cysteine to produce Ala-MCS, Ser-MCS, Gly-MCS and Cys-MCS. The resultants were verified by SEM, EDS, XRD, VSM, FT-IR and XPS. Adsorption of uranium with amino acids-modified magnetic chitosans were carried out. The parameters that affected the adsorption ability, selectivity toward uranium, and reusability have been illustrated. pH 6.5 was the most beneficial for the adsorption. The saturation adsorption capacity of Ala-MCS, Ser-MCS, GlyMCS, Cys-MCS were found as 658.88 mg/g +/- 1.0 %, 616.10 +/- 0.3 % mg/g, 646.38 +/- 1.8 % mg/g, 653.96 +/- 3.4 % mg/g and 409.15 +/- 4.6 % mg/g, respectively. The adsorption process was analyzed using kinetics (pseudo-first-order, pseudo-second-order and intraparticle diffusion models) and isotherms models (Langmuir and Freundlich models). The adsorption of uranium on Ala-MCS, Ser-MCS, Gly-MCS and Cys-MCS happened on monolayer and were controlled by chemisorption. The certified high adsorption amount and efficient solid-liquid separation proved amino acids-modified magnetic chitosan are promising adsorbents for removal of uranium from wastewater.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据