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Preparation of Dispersed Magnetite–Bentonite Composites and Kazcaine Adsorption on Them
Colloid Journal ( IF 1.1 ) Pub Date : 2021-06-10 , DOI: 10.1134/s1061933x21030091
G. Kurmangazhi , S. M. Tazhibayeva , K. B. Musabekov , I. S. Levin , M. S. Kuzin , L. E. Ermakova , V. K. Yu

Abstract

Magnetite particles are prepared from a mixed aqueous solution of FeCl2 and FeCl3, and magnetite−bentonite composite particles are obtained from a mixed dispersion of magnetite and bentonite by precipitation with ammonia. The dispersions are examined by the X-ray diffraction, transmission electron microscopy, IR spectroscopy, dynamic light scattering, and electrophoresis methods. In the presence of magnetite, the basal reflection at 2θ = 6.06° in the X-ray diffraction pattern of bentonite shifts to 7.14° due to the replacement of K+, Na+, and Mg2+ ions by Fe3+ ions. Moreover, peaks corresponding to iron compounds arise in the diffraction pattern, while an absorption band at 1405 cm–1 assigned to Fe–O bonds appears in the IR spectrum of the composite particles, thereby probably indicating the formation of small magnetite particles between bentonite layers. Along with the indicated changes, the passage from original bentonite to the magnetite−bentonite composite is accompanied by an increase in the ζ-potential of the particles from –35.1 to –25.7 mV and a decrease in their sizes from 300 to 220 nm. The latter phenomenon is explained by ion exchange, water removal from the interlayer space, and the contribution of smaller particles of magnetite. To test the functional potential of the obtained composite particles, the adsorption of a drug, kazcaine, on them is studied, and the maximum kazcaine adsorption value is found to be as large as 74.65 mg/g. The analysis of kazcaine adsorption kinetics at different temperatures is carried out to determine the thermodynamic parameters of the process. The results obtained show that the process can be described by a pseudo-second-order kinetic equation. The Langmuir model appears to be most suitable for describing the adsorption mechanism.



中文翻译:

分散磁铁矿-膨润土复合材料的制备及其卡兹卡因吸附

摘要

磁铁矿颗粒由FeCl 2和FeCl 3的混合水溶液制备,磁铁矿-膨润土复合颗粒由磁铁矿和膨润土的混合分散液经氨沉淀得到。通过 X 射线衍射、透射电子显微镜、IR 光谱、动态光散射和电泳方法检查分散体。在磁铁矿存在的情况下,由于 K +、Na +和 Mg 2+离子被 Fe 3+离子置换,膨润土 X 射线衍射图中 2θ = 6.06° 的基础反射移至 7.14° 。此外,衍射图中出现了对应于铁化合物的峰,而在 1405 cm 处的吸收带–1分配给 Fe-O 键出现在复合颗粒的红外光谱中,因此可能表明在膨润土层之间形成了小磁铁矿颗粒。随着指示的变化,从原始膨润土到磁铁矿-膨润土复合材料的转变伴随着颗粒的 ζ 电位从 –35.1 到 –25.7 mV 的增加以及它们的尺寸从 300 到 220 nm 的减小。后一种现象可以通过离子交换、从层间空间去除水分以及较小颗粒磁铁矿的贡献来解释。为了测试所得复合颗粒的功能潜力,研究了药物卡兹卡因对其的吸附,发现卡兹卡因的最大吸附值高达 74.65 mg/g。对不同温度下的卡兹卡因吸附动力学进行分析,以确定该过程的热力学参数。结果表明,该过程可以用拟二级动力学方程来描述。Langmuir 模型似乎最适合描述吸附机制。

更新日期:2021-06-11
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