Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 21, Issue 3, Pages 227-235Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1383-5866(00)00205-7
Keywords
p-nitrophenol; adsorption; stirrer speed; mass-transfer coefficient; adsorption isotherm
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An effective adsorbent developed from common sawdust has been used for the removal of p-nitrophenol from aqueous solution. It is observed that the degree of agitation has a significant effect on the rate of removal of p-nitrophenol. Higher initial concentration and lower temperature are more favorable for the adsorption of p-nitrophenol. The experimental results confirmed that the intraparticle diffusion has a hindering effect on the adsorption rate. An external mass-transfer model has been applied to interpret the rate data. The values of fluid-particle mass-transfer coefficient obtained from the experimental data have been compared with the predicted value. The mass-transfer coefficient is found to decrease with increasing concentration of p-nitrophenol. Adsorption equilibrium data fit most satisfactorily with the Langmuir adsorption isotherm. (C) 2001 Elsevier Science B.V. All rights reserved.
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