Adsorption of anionic methyl orange dye by polyaniline, poly(o-methylaniline) and poly(o-methoxyaniline)

IF 1.5 4区 化学 Q4 CHEMISTRY, PHYSICAL
Timur T. Sadykov, Roman S. Syakaev, Anastasia N. Andriianova, Akhat G. Mustafin
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引用次数: 0

Abstract

This study reports the effect of substituents in the ortho position of polyaniline on the adsorption capacity to remove the anionic dye methyl orange (MO) from an aqueous solution. The aim of this study is the synthesis of polyaniline (PANI) and its derivatives, poly-o-methylaniline (poly-o-toluidine, POT) and poly-o-methoxyaniline (poly-o-anisidine, POA) for the adsorption removal of MO dye. All polymers were obtained by oxidative polymerization of the corresponding monomers and characterized by scanning electron microscopy (SEM) and infrared spectroscopy (IR). The average particle size of the polymer was about 200 nm. The effect of various parameters such as pH, temperature, adsorption time and initial concentration was analyzed. It was found that the adsorption capacity for dye removal increases from 50.68 to 222.56 mg g−1 for PANI, from 16.89 to 66.57 mg g−1 for POT, and from 97.26 to 532.54 mg g−1 for POA with an increase in the initial dye concentration from 5 up to 50 mg L−1. For all polymers, the equilibrium state of MO adsorption was reached in 50 min. The results showed that MO adsorption on PANI, POT, and POA is well described by a pseudo second order kinetic model. Isothermal studies have shown that adsorption is in good agreement with the Langmuir isotherm model, as evidenced by higher values of correlation coefficients. Based on the data of thermodynamic studies, it was concluded that MO adsorption on PANI, POT, and POA is spontaneous and endothermic.

聚苯胺、聚(邻甲基苯胺)和聚(邻甲氧基苯胺)对阴离子甲基橙染料的吸附作用
本研究报告了聚苯胺正位取代基对从水溶液中去除阴离子染料甲基橙(MO)的吸附能力的影响。本研究的目的是合成聚苯胺(PANI)及其衍生物聚邻甲基苯胺(聚邻甲基苯胺,POT)和聚邻甲氧基苯胺(聚邻甲氧基苯胺,POA),用于吸附去除 MO 染料。所有聚合物都是通过相应单体的氧化聚合得到的,并通过扫描电子显微镜(SEM)和红外光谱(IR)进行了表征。聚合物的平均粒径约为 200 nm。分析了 pH 值、温度、吸附时间和初始浓度等各种参数的影响。结果发现,随着初始染料浓度从 5 毫克/升增加到 50 毫克/升,PANI 的染料吸附去除能力从 50.68 毫克/克增加到 222.56 毫克/克,POT 从 16.89 毫克/克增加到 66.57 毫克/克,POA 从 97.26 毫克/克增加到 532.54 毫克/克。所有聚合物在 50 分钟内都达到了 MO 吸附的平衡状态。结果表明,MO 在 PANI、POT 和 POA 上的吸附可以用伪二阶动力学模型很好地描述。等温研究表明,吸附与 Langmuir 等温线模型十分吻合,相关系数值较高就是证明。根据热力学研究数据得出的结论是,MO 在 PANI、POT 和 POA 上的吸附是自发的、内热的。
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来源期刊
CiteScore
3.30
自引率
6.70%
发文量
74
审稿时长
3 months
期刊介绍: As the leading archival journal devoted exclusively to chemical kinetics, the International Journal of Chemical Kinetics publishes original research in gas phase, condensed phase, and polymer reaction kinetics, as well as biochemical and surface kinetics. The Journal seeks to be the primary archive for careful experimental measurements of reaction kinetics, in both simple and complex systems. The Journal also presents new developments in applied theoretical kinetics and publishes large kinetic models, and the algorithms and estimates used in these models. These include methods for handling the large reaction networks important in biochemistry, catalysis, and free radical chemistry. In addition, the Journal explores such topics as the quantitative relationships between molecular structure and chemical reactivity, organic/inorganic chemistry and reaction mechanisms, and the reactive chemistry at interfaces.
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