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

• 香港科技大学化学与生物分子工程系戈登?麦凯教授退休纪念专刊 • 上一篇    下一篇

正磷酸活化木质素吸附Cr(VI)的固定床实验和模型

A.B. Albadarin1, C. Mangwandi1, A.H. Al-Muhtaseb1, G.M. Walker1,3, S.J. Allen1, M.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
  • 收稿日期:2012-02-17 修回日期:2012-05-23 出版日期:2012-06-28 发布日期:2012-05-23

Modelling and fixed bed column adsorption of Cr(VI) onto orthophosphoric acid-activated lignin

A.B. Albadarin1, C. Mangwandi1, A.H. Al-Muhtaseb1, G.M. Walker1,3, S.J. Allen1, M.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:2012-06-28 Published:2012-05-23

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

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

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