{"title":"茜草茎提取物对铝在酸性介质中腐蚀的吸附、动力学、热力学和抑制性能。","authors":"H. Chahul, A. Ayuba, S. Nyior","doi":"10.4314/CSJ.V6I1.4","DOIUrl":null,"url":null,"abstract":"The adsorption of Cissus populnea stem extract and its subsequent corrosion inhibition properties on aluminum in 0.5 M HCl solutions have been investigated using weight loss measurements. Inhibition efficiency of the plant extract increased with concentration but decreased with rise in temperature. The adsorption of the inhibitor on the aluminum surface was spontaneous and found to align with Langmuir, Freundlich, Temkin and Flory- Huggins adsorption isotherms. From the values of E a and ΔG 0 obtained, the mechanism of physical adsorption has been proposed. Some thermodynamic and activation parameters were also calculated. Keywords : Adsorption isotherm, Cissus populnea, corrosion, physisorption, thermodynamics","PeriodicalId":9900,"journal":{"name":"ChemSearch Journal","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":"{\"title\":\"Adsorptive, Kinetic, Thermodynamic and Inhibitive Properties of Cissus Populnea Stem Extract on the Corrosion of Aluminum in Acid Medium.\",\"authors\":\"H. Chahul, A. Ayuba, S. Nyior\",\"doi\":\"10.4314/CSJ.V6I1.4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The adsorption of Cissus populnea stem extract and its subsequent corrosion inhibition properties on aluminum in 0.5 M HCl solutions have been investigated using weight loss measurements. Inhibition efficiency of the plant extract increased with concentration but decreased with rise in temperature. The adsorption of the inhibitor on the aluminum surface was spontaneous and found to align with Langmuir, Freundlich, Temkin and Flory- Huggins adsorption isotherms. From the values of E a and ΔG 0 obtained, the mechanism of physical adsorption has been proposed. Some thermodynamic and activation parameters were also calculated. Keywords : Adsorption isotherm, Cissus populnea, corrosion, physisorption, thermodynamics\",\"PeriodicalId\":9900,\"journal\":{\"name\":\"ChemSearch Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2015-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ChemSearch Journal\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.4314/CSJ.V6I1.4\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ChemSearch Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4314/CSJ.V6I1.4","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
摘要
采用失重法研究了仙鹤茎提取物在0.5 M HCl溶液中的吸附性能及其对铝的缓蚀性能。植物提取物的抑菌率随浓度升高而升高，随温度升高而降低。抑制剂在铝表面的吸附是自发的，符合Langmuir, Freundlich, Temkin和Flory- Huggins吸附等温线。根据得到的ea和ΔG 0值，提出了物理吸附机理。计算了一些热力学和活化参数。关键词:吸附等温线，茜草，腐蚀，物理吸附，热力学
Adsorptive, Kinetic, Thermodynamic and Inhibitive Properties of Cissus Populnea Stem Extract on the Corrosion of Aluminum in Acid Medium.
The adsorption of Cissus populnea stem extract and its subsequent corrosion inhibition properties on aluminum in 0.5 M HCl solutions have been investigated using weight loss measurements. Inhibition efficiency of the plant extract increased with concentration but decreased with rise in temperature. The adsorption of the inhibitor on the aluminum surface was spontaneous and found to align with Langmuir, Freundlich, Temkin and Flory- Huggins adsorption isotherms. From the values of E a and ΔG 0 obtained, the mechanism of physical adsorption has been proposed. Some thermodynamic and activation parameters were also calculated. Keywords : Adsorption isotherm, Cissus populnea, corrosion, physisorption, thermodynamics
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