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碳包覆ZrO/Mn-Mg-Zn铁氧体纳米结构用于从二元体系中吸附Cs(I)和Sr(II)的研究：动力学与平衡研究

Utilization of carbon-coated ZrO/Mn-Mg-Zn ferrites nanostructures for the adsorption of Cs (I) and Sr (II) from the binary system: kinetic and equilibrium studies.

作者信息

Abdel Maksoud M I A, Murad G A, Hassan H S

机构信息

Radiation Physics Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.

Hot Laboratories and Waste Management Center, Egyptian Atomic Energy Authority (EAEA), Inshas, 13759, Egypt.

出版信息

BMC Chem. 2023 Nov 4;17(1):149. doi: 10.1186/s13065-023-01069-z.

DOI:10.1186/s13065-023-01069-z
PMID:37925482
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10625698/
Abstract

Carbon-coated ZrO/Mn-Mg-Zn ferrites nanostructures (CZ-FN) have been prepared as a new inorganic sorbent to remove Cs (I) and Sr (II) from a waste stream. Adsorption of Cs (I) and Sr (II) has been implemented considering different noteworthy parameters, for example, shaking time and the optimum time achieved high adsorption capacity of both ions [103 and 41 mg/g for Sr (II) and Cs (I)] was found 30 min. Also, the impact of pH values was studied; the best pH value for the adsorption process is pH 6. The adsorption saturation capacity of CZ-FN is 420.22 and 250.45 mg/g for strontium and cesium, respectively. The solubility percentage of CZ-FN was calculated utilizing diverse molarities from HNO, HCl, and NaOH as eluents, the obtained data reveals an increase in the solubility percentage with more increase in the molarity of the eluents. The elevation in the solubility percentage follows the following order; HNO < HCl < NaOH. The kinetic studies were applied using the nanolinear form of different kinetic models; it was found that the adsorption process obeys the nonlinear pseudo-second-order. According to equilibrium studies, the Langmuir model has been more accurate than the Freundlich model for adsorption in the case of binary systems. The values of Di for the strontium and cesium are 10 m/s, which displays the chemisorption nature of this process. The greatest values of the desorption process for the strontium and cesium are 96.87% and 94.43 by 0.3 M of HNO. This indicated that the carbon-coated ZrO/Mn-Mg-Zn ferrites could be regenerated and recycled to remove strontium and cesium ions from waste streams.

摘要

碳包覆ZrO/Mn-Mg-Zn铁氧体纳米结构（CZ-FN）已被制备为一种新型无机吸附剂，用于从废水中去除Cs（I）和Sr（II）。考虑了不同的重要参数来进行Cs（I）和Sr（II）的吸附，例如振荡时间，发现达到两种离子高吸附容量（Sr（II）和Cs（I）分别为103和41 mg/g）的最佳时间为30分钟。此外，还研究了pH值的影响；吸附过程的最佳pH值为6。CZ-FN对锶和铯的吸附饱和容量分别为420.22和250.45 mg/g。利用不同摩尔浓度的HNO、HCl和NaOH作为洗脱剂计算了CZ-FN的溶解百分比，所得数据表明随着洗脱剂摩尔浓度的增加，溶解百分比增加。溶解百分比的升高遵循以下顺序：HNO＜HCl＜NaOH。使用不同动力学模型的纳米线性形式进行了动力学研究；发现吸附过程遵循非线性伪二级动力学。根据平衡研究，在二元体系吸附的情况下，Langmuir模型比Freundlich模型更准确。锶和铯的扩散系数值为10 m/s，这表明该过程具有化学吸附性质。用0.3 M的HNO进行解吸过程时，锶和铯的最大解吸值分别为96.87%和94.43%。这表明碳包覆ZrO/Mn-Mg-Zn铁氧体可以再生和循环使用，以从废水中去除锶和铯离子。

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