Adsorption equilibrium and kinetic studies of crystal violet and naphthol green on torreya-grandis-skin-based activated carbon

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• 作者：Wei Dai (1)
  Huijing Yu (1)
  Na Ma (2)
  Xiaoyang Yan (1)
  
  1. College of Chemistry and Life Science ; Zhejiang Normal University ; Zhejiang Province Jinhua ; 321004 ; P. R. China
  2. College of Geography and Environmental Sciences ; Zhejiang Normal University ; Zhejiang Province Jinhua ; 321004 ; P. R. China
  
• 关键词：Adsorption ; Crystal Violet ; Naphthol Green ; Torreya Grandis Skin ; Activated Carbon
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：32
• 期：2
• 页码：335-341
• 全文大小：387 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

A new type of activated carbon, torreya-grandis-skin-based activated carbon (TAC), has been used to remove the harmful dyes (cationic dye crystal violet (CV) and anionic dye naphthol green (NG)) from contaminated water via batch adsorption. The effects of solution pH, adsorption time and temperature were studied. The Langmuir and Freundlich adsorption models were used to describe the equilibrium isotherm and isotherm constant calculation. It was found that the maximum equilibrium adsorption capacities were 292mg/g and 545mg/g for CV and NG, respectively. Adsorption kinetics was verified by pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models. Results indicated that the rate of dye adsorption followed pseudo-second-order kinetic model for the initial dye concentration range studied. Temperature-dependent adsorption behavior of CV and NG shows that the adsorption is spontaneous and endothermic, accompanying an entropy increase. This work indicates that TAC could be employed as a low-cost alternative for the removal of the textile dyes from effluents.