热对 PET 塑料影响的动力学研究:TGA、DTA、XRD 和 DSC 分析

A. Nurudeen, F. O. Nwosu, M. Soliu
{"title":"热对 PET 塑料影响的动力学研究:TGA、DTA、XRD 和 DSC 分析","authors":"A. Nurudeen, F. O. Nwosu, M. Soliu","doi":"10.9734/irjpac/2024/v25i1845","DOIUrl":null,"url":null,"abstract":"In this work, the effects of heat on plastic waste (PET plastic bottles) were investigated. During thermogravimetric analysis, the kinetics of the PET pyrolysis was studied using a combination of model-fitting and model-free methods. About 12mg of the grinded PET sample was weighed into the ceramic crucible and then heated from temperature of 30 °C to 950 °C at two heating rates of 10°C/min and 20°C /min.  Thermogravimetric analysis indicated that the decomposition of plastic waste in a Nitrogen atmosphere can be divided into three stages: the minor loss stage (100°C), the major loss stage (450–520°C) and the stable loss stage (500–900°C). The corresponding weight loss at two different heating rates of 10°C/min and 20°C /min were determined to of 70% and 77.7% respectively. Based on R2 (regression coefficient) values, heating rate of 20oC/min gave the values (0.9279) for the model free method employed (KAS model). When compared to the model fitting, 0.75th order of reaction gave the closest  R2 value (0.9643) which also translated to a very close Activation energies of 264 KJ/mol and 255 KJ/mol respectively. All in all, it can be deduced that the activation energy of PET pyrolysis falls within 250 – 280 KJ/mol based on this study. Also, X-Ray Diffraction and Differential Scanning Calorimetry analysis were carried out. The narrow and high nature of the XRD peaks depicted that the sample is crystalline. And lastly, DSC analysis investigated the heat flowing in and out of the PET sample. The exodermal (where cold re-crystallization occurred) and endothermal (where melting occur) peaks were recorded as 165oC and 138oC respectively. It is recommended that other model-free and model-fitting methods should be invested in further research in order to generate a wide range of data for kinetics of PET.","PeriodicalId":14371,"journal":{"name":"International Research Journal of Pure and Applied Chemistry","volume":"66 12","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Kinetic Studies of Effects of Heat on PET Plastics: TGA, DTA, XRD and DSC Analysis\",\"authors\":\"A. Nurudeen, F. O. Nwosu, M. Soliu\",\"doi\":\"10.9734/irjpac/2024/v25i1845\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this work, the effects of heat on plastic waste (PET plastic bottles) were investigated. During thermogravimetric analysis, the kinetics of the PET pyrolysis was studied using a combination of model-fitting and model-free methods. About 12mg of the grinded PET sample was weighed into the ceramic crucible and then heated from temperature of 30 °C to 950 °C at two heating rates of 10°C/min and 20°C /min.  Thermogravimetric analysis indicated that the decomposition of plastic waste in a Nitrogen atmosphere can be divided into three stages: the minor loss stage (100°C), the major loss stage (450–520°C) and the stable loss stage (500–900°C). The corresponding weight loss at two different heating rates of 10°C/min and 20°C /min were determined to of 70% and 77.7% respectively. Based on R2 (regression coefficient) values, heating rate of 20oC/min gave the values (0.9279) for the model free method employed (KAS model). When compared to the model fitting, 0.75th order of reaction gave the closest  R2 value (0.9643) which also translated to a very close Activation energies of 264 KJ/mol and 255 KJ/mol respectively. All in all, it can be deduced that the activation energy of PET pyrolysis falls within 250 – 280 KJ/mol based on this study. Also, X-Ray Diffraction and Differential Scanning Calorimetry analysis were carried out. The narrow and high nature of the XRD peaks depicted that the sample is crystalline. And lastly, DSC analysis investigated the heat flowing in and out of the PET sample. The exodermal (where cold re-crystallization occurred) and endothermal (where melting occur) peaks were recorded as 165oC and 138oC respectively. It is recommended that other model-free and model-fitting methods should be invested in further research in order to generate a wide range of data for kinetics of PET.\",\"PeriodicalId\":14371,\"journal\":{\"name\":\"International Research Journal of Pure and Applied Chemistry\",\"volume\":\"66 12\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-02-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Research Journal of Pure and Applied Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.9734/irjpac/2024/v25i1845\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Research Journal of Pure and Applied Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.9734/irjpac/2024/v25i1845","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

这项工作研究了热量对塑料废弃物(PET 塑料瓶)的影响。在热重分析过程中,采用模型拟合和无模型相结合的方法研究了 PET 的热解动力学。称取约 12 毫克磨碎的 PET 样品放入陶瓷坩埚中,然后以 10°C/min 和 20°C/min 两种加热速率从 30°C 升温至 950°C。 热重分析表明,废塑料在氮气环境中的分解可分为三个阶段:轻微损耗阶段(100°C)、主要损耗阶段(450-520°C)和稳定损耗阶段(500-900°C)。在 10°C/min 和 20°C /min 两种不同的加热速率下,相应的失重率分别为 70% 和 77.7%。根据 R2(回归系数)值,采用无模型方法(KAS 模型)时,20°C/min 的加热速率得出的值为(0.9279)。与模型拟合相比,0.75阶反应给出了最接近的 R2 值(0.9643),这也意味着活化能非常接近,分别为 264 KJ/mol 和 255 KJ/mol。总之,根据这项研究可以推断出 PET 高温分解的活化能在 250-280 KJ/mol 之间。此外,还进行了 X 射线衍射和差示扫描量热分析。X 射线衍射峰的窄而高的性质表明样品是结晶的。最后,差示扫描量热分析研究了进出 PET 样品的热量。记录到的外皮峰(发生冷再结晶)和内热峰(发生熔化)分别为 165 摄氏度和 138 摄氏度。建议在进一步研究中采用其他无模型和模型拟合方法,以生成 PET 动力学的各种数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinetic Studies of Effects of Heat on PET Plastics: TGA, DTA, XRD and DSC Analysis
In this work, the effects of heat on plastic waste (PET plastic bottles) were investigated. During thermogravimetric analysis, the kinetics of the PET pyrolysis was studied using a combination of model-fitting and model-free methods. About 12mg of the grinded PET sample was weighed into the ceramic crucible and then heated from temperature of 30 °C to 950 °C at two heating rates of 10°C/min and 20°C /min.  Thermogravimetric analysis indicated that the decomposition of plastic waste in a Nitrogen atmosphere can be divided into three stages: the minor loss stage (100°C), the major loss stage (450–520°C) and the stable loss stage (500–900°C). The corresponding weight loss at two different heating rates of 10°C/min and 20°C /min were determined to of 70% and 77.7% respectively. Based on R2 (regression coefficient) values, heating rate of 20oC/min gave the values (0.9279) for the model free method employed (KAS model). When compared to the model fitting, 0.75th order of reaction gave the closest  R2 value (0.9643) which also translated to a very close Activation energies of 264 KJ/mol and 255 KJ/mol respectively. All in all, it can be deduced that the activation energy of PET pyrolysis falls within 250 – 280 KJ/mol based on this study. Also, X-Ray Diffraction and Differential Scanning Calorimetry analysis were carried out. The narrow and high nature of the XRD peaks depicted that the sample is crystalline. And lastly, DSC analysis investigated the heat flowing in and out of the PET sample. The exodermal (where cold re-crystallization occurred) and endothermal (where melting occur) peaks were recorded as 165oC and 138oC respectively. It is recommended that other model-free and model-fitting methods should be invested in further research in order to generate a wide range of data for kinetics of PET.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信