Samin Sirusbakht, Leila Vafajoo, Gordon McKay, Prakash Parthasarathy
{"title":"应用响应面方法优化使用预处理锯屑去除水溶液中的铬(VI)的效果","authors":"Samin Sirusbakht, Leila Vafajoo, Gordon McKay, Prakash Parthasarathy","doi":"10.1002/ep.14434","DOIUrl":null,"url":null,"abstract":"<p>Increased chromium usage in industrial applications as chromium III and chromium VI, include metal plating, steel alloys, leather processing, medical applications, and chromium dyeing operations, has resulted in water pollution by Cr (VI) ions, which being toxic and carcinogenic has developed into significant environmental and health problems. The purpose of this research is to remove Cr (VI) ions from synthetic wastewater utilising modified sawdust as an inexpensive adsorbent. Two modified sawdust samples were produced, one using sodium hydroxide and one using sulfuric acid. The experimentation, based on several batch systems, has been undertaken at 25–65°C with 0.5–1.5 g/L sawdust dosage. These conditions were applied to remove Cr (VI) ions at concentrations of 1–6 ppm at pH values from 3 to 10. The results have shown that adsorption onto sawdust followed an intraparticle diffusion mechanism with various rate parameters from 0.65 to 5.24 mg g<sup>−1</sup> min, for treated and untreated sawdust. The distribution coefficient <span></span><math>\n <mrow>\n <mfenced>\n <msub>\n <mi>k</mi>\n <mi>c</mi>\n </msub>\n </mfenced>\n </mrow></math>, enthalpy <span></span><math>\n <mrow>\n <mfenced>\n <mrow>\n <mi>Δ</mi>\n <mi>H</mi>\n </mrow>\n </mfenced>\n </mrow></math>, thermodynamic standard free energy <span></span><math>\n <mrow>\n <mfenced>\n <mrow>\n <mi>Δ</mi>\n <mi>G</mi>\n </mrow>\n </mfenced>\n </mrow></math>, and entropy <span></span><math>\n <mrow>\n <mfenced>\n <mrow>\n <mi>Δ</mi>\n <mi>S</mi>\n </mrow>\n </mfenced>\n </mrow></math> were determined from a number of temperature studies. Kinetic studies showed that the pseudo-second order model gave the optimum correlation to the experimental results. The Freundlich and Langmuir isotherms were applied to analyse the experimental equilibrium results. The optimised conditions for the adsorption process were obtained using the D-optimal design method, and the maximum removal percentage of 100%, was determined at pH = 3, <i>T</i> = 25°C, adsorbent dosage = 1.5 g/L, and an initial Cr (VI) concentration = 5.72 ppm.</p>","PeriodicalId":11701,"journal":{"name":"Environmental Progress & Sustainable Energy","volume":"43 5","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Application of response surface methodology to optimize chromium (VI) removal from aqueous solution using pre-treated sawdust\",\"authors\":\"Samin Sirusbakht, Leila Vafajoo, Gordon McKay, Prakash Parthasarathy\",\"doi\":\"10.1002/ep.14434\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Increased chromium usage in industrial applications as chromium III and chromium VI, include metal plating, steel alloys, leather processing, medical applications, and chromium dyeing operations, has resulted in water pollution by Cr (VI) ions, which being toxic and carcinogenic has developed into significant environmental and health problems. The purpose of this research is to remove Cr (VI) ions from synthetic wastewater utilising modified sawdust as an inexpensive adsorbent. Two modified sawdust samples were produced, one using sodium hydroxide and one using sulfuric acid. The experimentation, based on several batch systems, has been undertaken at 25–65°C with 0.5–1.5 g/L sawdust dosage. These conditions were applied to remove Cr (VI) ions at concentrations of 1–6 ppm at pH values from 3 to 10. The results have shown that adsorption onto sawdust followed an intraparticle diffusion mechanism with various rate parameters from 0.65 to 5.24 mg g<sup>−1</sup> min, for treated and untreated sawdust. The distribution coefficient <span></span><math>\\n <mrow>\\n <mfenced>\\n <msub>\\n <mi>k</mi>\\n <mi>c</mi>\\n </msub>\\n </mfenced>\\n </mrow></math>, enthalpy <span></span><math>\\n <mrow>\\n <mfenced>\\n <mrow>\\n <mi>Δ</mi>\\n <mi>H</mi>\\n </mrow>\\n </mfenced>\\n </mrow></math>, thermodynamic standard free energy <span></span><math>\\n <mrow>\\n <mfenced>\\n <mrow>\\n <mi>Δ</mi>\\n <mi>G</mi>\\n </mrow>\\n </mfenced>\\n </mrow></math>, and entropy <span></span><math>\\n <mrow>\\n <mfenced>\\n <mrow>\\n <mi>Δ</mi>\\n <mi>S</mi>\\n </mrow>\\n </mfenced>\\n </mrow></math> were determined from a number of temperature studies. Kinetic studies showed that the pseudo-second order model gave the optimum correlation to the experimental results. The Freundlich and Langmuir isotherms were applied to analyse the experimental equilibrium results. The optimised conditions for the adsorption process were obtained using the D-optimal design method, and the maximum removal percentage of 100%, was determined at pH = 3, <i>T</i> = 25°C, adsorbent dosage = 1.5 g/L, and an initial Cr (VI) concentration = 5.72 ppm.</p>\",\"PeriodicalId\":11701,\"journal\":{\"name\":\"Environmental Progress & Sustainable Energy\",\"volume\":\"43 5\",\"pages\":\"\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2024-06-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Progress & Sustainable Energy\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/ep.14434\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Progress & Sustainable Energy","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ep.14434","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Application of response surface methodology to optimize chromium (VI) removal from aqueous solution using pre-treated sawdust
Increased chromium usage in industrial applications as chromium III and chromium VI, include metal plating, steel alloys, leather processing, medical applications, and chromium dyeing operations, has resulted in water pollution by Cr (VI) ions, which being toxic and carcinogenic has developed into significant environmental and health problems. The purpose of this research is to remove Cr (VI) ions from synthetic wastewater utilising modified sawdust as an inexpensive adsorbent. Two modified sawdust samples were produced, one using sodium hydroxide and one using sulfuric acid. The experimentation, based on several batch systems, has been undertaken at 25–65°C with 0.5–1.5 g/L sawdust dosage. These conditions were applied to remove Cr (VI) ions at concentrations of 1–6 ppm at pH values from 3 to 10. The results have shown that adsorption onto sawdust followed an intraparticle diffusion mechanism with various rate parameters from 0.65 to 5.24 mg g−1 min, for treated and untreated sawdust. The distribution coefficient , enthalpy , thermodynamic standard free energy , and entropy were determined from a number of temperature studies. Kinetic studies showed that the pseudo-second order model gave the optimum correlation to the experimental results. The Freundlich and Langmuir isotherms were applied to analyse the experimental equilibrium results. The optimised conditions for the adsorption process were obtained using the D-optimal design method, and the maximum removal percentage of 100%, was determined at pH = 3, T = 25°C, adsorbent dosage = 1.5 g/L, and an initial Cr (VI) concentration = 5.72 ppm.
期刊介绍:
Environmental Progress , a quarterly publication of the American Institute of Chemical Engineers, reports on critical issues like remediation and treatment of solid or aqueous wastes, air pollution, sustainability, and sustainable energy. Each issue helps chemical engineers (and those in related fields) stay on top of technological advances in all areas associated with the environment through feature articles, updates, book and software reviews, and editorials.