{"title":"伞形蛇舌草活性炭吸附活性毒性染料的实验研究","authors":"J. Sheeja, K. Sampath, R. Kesavasamy","doi":"10.1155/2021/5035539","DOIUrl":null,"url":null,"abstract":"Hedyotis umbellate activated carbon (HUAC) was prepared by chemical and thermal activation. The adsorption behavior of Hedyotis umbellate activated carbon in aqueous basic green 4 (BG4) and acid fuchsin (AF) was investigated and characterized by UV-vis, FTIR, and FESEM. The possible mechanism of the adsorption of BG4 and AF dyes on the HUAC surface was framed. The influence of various adsorption control parameters like the initial dye concentration, pH, adsorbent dose, contact time, and temperature was studied. The data confirmed excellent BG4 removal of 97.94% at pH 10 and AF removal of 76.7% at pH 4. The experimental data were fitted using Langmuir, Freundlich, and Temkin isotherms to examine the adsorption mechanism. The adsorption data revealed monolayer adsorption of BG4 with the maximum capacity of 102.38 mg/g and multilayer adsorption of AF with the capacity of 139.33 mg/g. The kinetic data for different initial dye concentrations were computed using pseudofirst order, pseudosecond order, and intraparticle diffusion models. Thermodynamic parameters like Gibbs free energy change \n \n ∆\n \n \n G\n \n \n 0\n \n \n \n , enthalpy change \n \n ∆\n \n \n H\n \n \n 0\n \n \n \n , and entropy change \n \n ∆\n \n \n S\n \n \n 0\n \n \n \n were evaluated. From the values obtained, the negative values of \n \n ∆\n \n \n G\n \n \n 0\n \n \n \n and \n \n ∆\n \n \n H\n \n \n 0\n \n \n \n indicate that the adsorption of BG4 and AF by HUAC is spontaneous and exothermic.","PeriodicalId":7315,"journal":{"name":"Adsorption Science & Technology","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":"{\"title\":\"Experimental Investigations on Adsorption of Reactive Toxic Dyes Using Hedyotis umbellate Activated Carbon\",\"authors\":\"J. Sheeja, K. Sampath, R. Kesavasamy\",\"doi\":\"10.1155/2021/5035539\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Hedyotis umbellate activated carbon (HUAC) was prepared by chemical and thermal activation. The adsorption behavior of Hedyotis umbellate activated carbon in aqueous basic green 4 (BG4) and acid fuchsin (AF) was investigated and characterized by UV-vis, FTIR, and FESEM. The possible mechanism of the adsorption of BG4 and AF dyes on the HUAC surface was framed. The influence of various adsorption control parameters like the initial dye concentration, pH, adsorbent dose, contact time, and temperature was studied. The data confirmed excellent BG4 removal of 97.94% at pH 10 and AF removal of 76.7% at pH 4. The experimental data were fitted using Langmuir, Freundlich, and Temkin isotherms to examine the adsorption mechanism. The adsorption data revealed monolayer adsorption of BG4 with the maximum capacity of 102.38 mg/g and multilayer adsorption of AF with the capacity of 139.33 mg/g. The kinetic data for different initial dye concentrations were computed using pseudofirst order, pseudosecond order, and intraparticle diffusion models. Thermodynamic parameters like Gibbs free energy change \\n \\n ∆\\n \\n \\n G\\n \\n \\n 0\\n \\n \\n \\n , enthalpy change \\n \\n ∆\\n \\n \\n H\\n \\n \\n 0\\n \\n \\n \\n , and entropy change \\n \\n ∆\\n \\n \\n S\\n \\n \\n 0\\n \\n \\n \\n were evaluated. From the values obtained, the negative values of \\n \\n ∆\\n \\n \\n G\\n \\n \\n 0\\n \\n \\n \\n and \\n \\n ∆\\n \\n \\n H\\n \\n \\n 0\\n \\n \\n \\n indicate that the adsorption of BG4 and AF by HUAC is spontaneous and exothermic.\",\"PeriodicalId\":7315,\"journal\":{\"name\":\"Adsorption Science & Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2021-08-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"7\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Adsorption Science & Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1155/2021/5035539\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Adsorption Science & Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1155/2021/5035539","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
Experimental Investigations on Adsorption of Reactive Toxic Dyes Using Hedyotis umbellate Activated Carbon
Hedyotis umbellate activated carbon (HUAC) was prepared by chemical and thermal activation. The adsorption behavior of Hedyotis umbellate activated carbon in aqueous basic green 4 (BG4) and acid fuchsin (AF) was investigated and characterized by UV-vis, FTIR, and FESEM. The possible mechanism of the adsorption of BG4 and AF dyes on the HUAC surface was framed. The influence of various adsorption control parameters like the initial dye concentration, pH, adsorbent dose, contact time, and temperature was studied. The data confirmed excellent BG4 removal of 97.94% at pH 10 and AF removal of 76.7% at pH 4. The experimental data were fitted using Langmuir, Freundlich, and Temkin isotherms to examine the adsorption mechanism. The adsorption data revealed monolayer adsorption of BG4 with the maximum capacity of 102.38 mg/g and multilayer adsorption of AF with the capacity of 139.33 mg/g. The kinetic data for different initial dye concentrations were computed using pseudofirst order, pseudosecond order, and intraparticle diffusion models. Thermodynamic parameters like Gibbs free energy change
∆
G
0
, enthalpy change
∆
H
0
, and entropy change
∆
S
0
were evaluated. From the values obtained, the negative values of
∆
G
0
and
∆
H
0
indicate that the adsorption of BG4 and AF by HUAC is spontaneous and exothermic.
期刊介绍:
Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.