SCI和EI收录∣中国化工学会会刊

›› 2012, Vol. 20 ›› Issue (3): 469-477.

• Festschrift in Honor of Professor Gordon McKay on occasion of his retirement • Previous Articles     Next Articles

Modelling and Fixed Bed Column Adsorption of Cr(Ⅵ) onto Orthophosphoric Acid-activated Lignin

Ahmad B. Albadarin1, Chirangano Mangwandi1, Ala a H. Al-Muhtaseb2, Gavin M. Walker1,3, Stephen J. Allen1, Mohammad N. M. Ahmad1,2   

  1. 1. School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast BT9 5AG, Northern Ireland, UK.;
    2. Petroleum and Chemical Engineering Department, Faculty of Engineering, Sultan Qaboos University, P. O. Box 33, Al-Khod, Oman;
    3. Materials Surface Science Institute, Department of Chemical and Environmental Sciences, University of Limerick, Ireland
  • Received:2012-02-17 Revised:2012-05-23 Online:2012-08-17 Published:2012-06-28

Modelling and Fixed Bed Column Adsorption of Cr(Ⅵ) onto Orthophosphoric Acid-activated Lignin

Ahmad B. Albadarin1, Chirangano Mangwandi1, Ala a H. Al-Muhtaseb2, Gavin M. Walker1,3, Stephen J. Allen1, Mohammad N. M. Ahmad1,2   

  1. 1. School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast BT9 5AG, Northern Ireland, UK.;
    2. Petroleum and Chemical Engineering Department, Faculty of Engineering, Sultan Qaboos University, P. O. Box 33, Al-Khod, Oman;
    3. Materials Surface Science Institute, Department of Chemical and Environmental Sciences, University of Limerick, Ireland
  • 通讯作者: Gavin M. Walker, E-mail: g.walker@qub.ac.uk

Abstract: The advantage of using an available and abundant residual biomass,such as lignin,as a raw material for activated carbons is that it provides additional economical interest to the technical studies.In the current investigation,a more complete understanding of adsorption of Cr(VI) from aqueous systems onto H3PO4-acid activated lignin has been achieved via microcolumns,which were operated under various process conditions.The practice of using microcolumn is appropriate for defining the adsorption parameters and for screening a large number of potential adsorbents.The effects of solution pH(2-8),initial metal ion concentration(0.483-1.981 mmol·L-1),flow rate(1.0-3.1 cm3·min-1),ionic strength(0.01-0.30 mmol·L-1) and adsorbent mass(0.11-0.465 g) on Cr(VI) adsorption were studied by assessing the microcolumn breakthrough curve.The microcolumn data were fitted by the Thomas model,the modified Dose model and the BDST model.As expected,the adsorption capacity increased with initial Cr(VI) concentration.High linear flow rates,pH values and ionic strength led to early breakthrough of Cr(VI).The model constants obtained in this study can be used for the design of pilot scale adsorption process.

Key words: activated carbon, lignin, hexavalent chromium, adsorption, fixed bed column

摘要: The advantage of using an available and abundant residual biomass,such as lignin,as a raw material for activated carbons is that it provides additional economical interest to the technical studies.In the current investigation,a more complete understanding of adsorption of Cr(VI) from aqueous systems onto H3PO4-acid activated lignin has been achieved via microcolumns,which were operated under various process conditions.The practice of using microcolumn is appropriate for defining the adsorption parameters and for screening a large number of potential adsorbents.The effects of solution pH(2-8),initial metal ion concentration(0.483-1.981 mmol·L-1),flow rate(1.0-3.1 cm3·min-1),ionic strength(0.01-0.30 mmol·L-1) and adsorbent mass(0.11-0.465 g) on Cr(VI) adsorption were studied by assessing the microcolumn breakthrough curve.The microcolumn data were fitted by the Thomas model,the modified Dose model and the BDST model.As expected,the adsorption capacity increased with initial Cr(VI) concentration.High linear flow rates,pH values and ionic strength led to early breakthrough of Cr(VI).The model constants obtained in this study can be used for the design of pilot scale adsorption process.

关键词: activated carbon, lignin, hexavalent chromium, adsorption, fixed bed column