Batch Adsorption of Orange II Dye on a New Green Hydrogel-Study on Working Parameters and Process Enhancement.

IF 5.3 3区化学 Q1 POLYMER SCIENCE Gels Pub Date : 2025-01-20 DOI:10.3390/gels11010079

Andrei-Ionuț Simion, Cristina-Gabriela Grigoraș, Lidia Favier

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Abstract

A new green hydrogel consisting of cherry stone (CS) powder and sodium alginate (SA) was synthesized through physical crosslinking. The product had a mean diameter of 3.95 mm, a moisture content of 92.28%, a bulk density of 0.58 g/cm³, and a swelling ratio of 45.10%. The analyses of its morphological structure and functional groups by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) showed the successful entrapping of the CS in the SA polymeric matrix. The viability of the prepared hydrogel as adsorbent was tested towards Orange II (OII) anionic dye. The influence of the pH, adsorbent amount, contact time, and initial dye concentration was evaluated. Then, the impact of three accelerating factors (stirring speed, ultrasound exposure duration, and temperature) on the OII retention was investigated. The highest recorded removal efficiency and adsorption capacity were 82.20% and 6.84 mg/g, respectively. The adsorption followed Elovich and pseudo-second-order kinetics, was adequately described by Freundlich and Khan isotherms, and can be defined as spontaneous, endothermic, and random. The experiments confirmed that the obtained hydrogel can be used acceptably for at least two consecutive cycles, sustaining its effectiveness in water decontamination.

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新型绿色水凝胶批量吸附橙ⅱ染料——工作参数及工艺改进研究

以樱桃核（CS）粉和海藻酸钠（SA）为原料，通过物理交联法制备了一种新型绿色水凝胶。产品平均直径3.95 mm，含水率92.28%，容重0.58 g/cm3，溶胀率45.10%。通过扫描电镜（SEM）和傅里叶变换红外光谱（FTIR）对CS的形态结构和官能团进行了分析，结果表明CS成功地包裹在SA聚合物基体中。对制备的水凝胶作为吸附剂对橙二（OII）阴离子染料的吸附性能进行了测试。考察了pH、吸附剂用量、接触时间和初始染料浓度等因素的影响。然后，研究了三个加速因素（搅拌速度、超声曝光时间和温度）对油脂保留率的影响。最高去除率为82.20%，吸附量为6.84 mg/g。吸附遵循Elovich和拟二级动力学，Freundlich和Khan等温线可以充分描述吸附，可以定义为自发、吸热和随机。实验证实，所获得的水凝胶可以连续使用至少两个循环，保持其在水净化中的有效性。

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来源期刊

Gels POLYMER SCIENCE-

CiteScore

4.70

自引率

19.60%

发文量

707

审稿时长

11 weeks

期刊介绍： The journal Gels (ISSN 2310-2861) is an international, open access journal on physical (supramolecular) and chemical gel-based materials. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the maximum length of the papers, and full experimental details must be provided so that the results can be reproduced. Short communications, full research papers and review papers are accepted formats for the preparation of the manuscripts. Gels aims to serve as a reference journal with a focus on gel materials for researchers working in both academia and industry. Therefore, papers demonstrating practical applications of these materials are particularly welcome. Occasionally, invited contributions (i.e., original research and review articles) on emerging issues and high-tech applications of gels are published as special issues.