Role of the surface chemistry of activated carbons in dye removal from aqueous solution

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• 作者：Hua-lei Zhou ; Wen-juan Zhen ; Qian Zhu&#8230
• 关键词：activated carbon ; decolorization ; dyes ; modification ; surface chemistry
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：22
• 期：7
• 页码：770-776
• 全文大小：866 KB
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• 作者单位：Hua-lei Zhou (1)
  Wen-juan Zhen (1)
  Qian Zhu (1)
  Xiao-bin Wu (1)
  Zhi-dong Chang (1)
  Wen-jun Li (1)
  
  1. Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

Commercial activated carbons were modified by a series of chemical or physical treatments using H2O2, NH3, and heating under N2 flow without notably changing their pore structures. The resultant carbons were characterized by N2 adsorption and Bohem titration and then used to remove Ponceau 4R, methyl orange and brilliant blue from aqueous solutions. Surface chemistry was found to play a significantly different role in removing these three compounds. The removal of anionic Ponceau 4R increases with increasing carbon surface basicity due to the predominant dispersive interaction mechanism. In contrast, surface chemistry has little effect on the removal of anionic methyl orange, which can be explained by two parallel mechanisms involving electrostatic and dispersive interactions due to the basic amine group in a dye molecule. The influence of surface chemistry on the removal of amphoteric brilliant blue dye can also be ignored due to a weak interaction between the carbons and dye molecules, which is resulted from strong cohesive energy from electrostatic forces inside amphoteric dye molecules.