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Facile synthesis of α-MnO2 micronests composed of nanowires and their enhanced adsorption to Congo red 被引量:2

Facile synthesis of α-MnO2 micronests composed of nanowires and their enhanced adsorption to Congo red
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摘要 In this paper, α-MnO2 micronests composed of nanowires were fabricated via a hydrothermal reaction of MnSO4. H20 and K2S208 solutions. The α-MnO2 micron- ests were demonstrated to have a higher adsorption capacity than 7-MnO2 microspheres due to their large specific surface area. The amount of Congo red adsorbed per unit weight of α-MnO2 micronests increased signifi- cantly from 114 to 282mg.g-1 with concentration of Congo red solution increasing from 50 to 200 mg. L-1, but it had a little change with temperature. Kinetics, isotherms and thermodynamics for the adsorption of Congo red on α- MnO2 micronests were examined. The adsorption process followed the pseudo-second-order kinetics with good correlation. The experimental data were analyzed by Langmuir and Freundlich models, and equilibrium data fitted the Langmuir isotherm very well with maximum monolayer adsorption capacity of 625 mg. g-1 at 22 ℃. The adsorption was spontaneous and endothermic accord- ing to thermodynamic studies. The experimental results indicate that α-MnO2 micronests possess a high adsorption capacity and could be employed as a replacement of traditional sorbents. In this paper, α-MnO2 micronests composed of nanowires were fabricated via a hydrothermal reaction of MnSO4. H20 and K2S208 solutions. The α-MnO2 micron- ests were demonstrated to have a higher adsorption capacity than 7-MnO2 microspheres due to their large specific surface area. The amount of Congo red adsorbed per unit weight of α-MnO2 micronests increased signifi- cantly from 114 to 282mg.g-1 with concentration of Congo red solution increasing from 50 to 200 mg. L-1, but it had a little change with temperature. Kinetics, isotherms and thermodynamics for the adsorption of Congo red on α- MnO2 micronests were examined. The adsorption process followed the pseudo-second-order kinetics with good correlation. The experimental data were analyzed by Langmuir and Freundlich models, and equilibrium data fitted the Langmuir isotherm very well with maximum monolayer adsorption capacity of 625 mg. g-1 at 22 ℃. The adsorption was spontaneous and endothermic accord- ing to thermodynamic studies. The experimental results indicate that α-MnO2 micronests possess a high adsorption capacity and could be employed as a replacement of traditional sorbents.
作者 Weixin ZHANG
出处 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2014年第1期64-72,共9页 化学科学与工程前沿(英文版)
关键词 MNO2 Congo red ADSORPTION kinetics ISOTHERM THERMODYNAMICS MnO2, Congo red, adsorption, kinetics, isotherm, thermodynamics
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