Adsorption characteristics of individual and binary mixtures of ciprofloxacin and Cr(VI) in water using MnO2 colloidal particles

IF 2.2 4区 化学 Q3 CHEMISTRY, PHYSICAL Colloid and Polymer Science Pub Date : 2024-06-08 DOI:10.1007/s00396-024-05275-6
Thi Minh Hang Tran, Thi Duyen Tran, Thi Diu Dinh, Manh Khai Nguyen, Nguyen Thi Ngoc Anh, Nguyen Kim Nga, Thi Hai Yen Doan, Tien Duc Pham
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Abstract

In the present study, the MnO2 adsorbents with a crystal structure, the components of approximately 59% Mn and 40% O, and the specific linkages of -OH and O-Mn-O were characterized by the techniques XDR, EDX, and FI-IR, respectively. Especially, the individual and simultaneous adsorptions of chromium, Cr(VI), and an antibiotic, CFX, on the manganese dioxide (MnO2) material were systematically investigated. Compared with the individual adsorption, the CFX adsorption efficiency was significantly reduced in the Cr(VI) presence due to the Cr(VI)-CFX complexation formed by the Cr2O72− or HCrO4-NH2+ electrostatic attractions. The optimal experimental conditions for the Cr(VI)-CFX simultaneous adsorption were found to be pH 6, 1 mM NaCl, 60 min contact time, and 50 mg.mL−1 MnO2 dosage. The maximum adsorption efficiencies of the Cr(VI) and the CFX on the MnO2 were achieved at 98.1 and 87.5%, respectively. The maximum adsorption capacities of the Cr(VI) and CFX were correspondingly extrapolated to be 144.5 and 100.1 mg.g−1 by the Langmuir adsorption model. The Cr(VI)-CFX simultaneous adsorption was adequately described by the Freundlich isotherm and the pseudo-second kinetic models. The chemisorption of Cr(VI)-CFX governed the simultaneous adsorption with the formation of multiple adsorbed layers.

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利用 MnO2 胶体颗粒研究环丙沙星和六价铬在水中的单独和二元混合物的吸附特性
本研究采用 XDR、EDX 和 FI-IR 技术分别对具有晶体结构的二氧化锰(MnO2)吸附剂、约 59% 的 Mn 和 40% 的 O 以及特定的 -OH 和 O-Mn-O 连接进行了表征。特别是系统地研究了二氧化锰(MnO2)材料对铬(Cr(VI))和抗生素(CFX)的单独吸附和同时吸附。与单独吸附相比,由于 Cr2O72- 或 HCrO4--NH2+ 静电吸引形成的 Cr(VI)-CFX 复合物,CFX 在 Cr(VI) 存在时的吸附效率明显降低。Cr(VI)-CFX 同时吸附的最佳实验条件为 pH 值 6、1 mM NaCl、60 分钟接触时间和 50 mg.mL-1 MnO2 用量。六价铬和 CFX 在 MnO2 上的最大吸附效率分别为 98.1% 和 87.5%。根据 Langmuir 吸附模型推断,Cr(VI) 和 CFX 的最大吸附容量分别为 144.5 和 100.1 mg.g-1。Freundlich 等温线和假秒动力学模型充分描述了 Cr(VI)-CFX 同时吸附的情况。Cr(VI)-CFX的化学吸附决定了同时吸附并形成多个吸附层。
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来源期刊
Colloid and Polymer Science
Colloid and Polymer Science 化学-高分子科学
CiteScore
4.60
自引率
4.20%
发文量
111
审稿时长
2.2 months
期刊介绍: Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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