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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383

Braz. J. Chem. Eng. vol.22 no.2 São Paulo Apr./June 2005

http://dx.doi.org/10.1590/S0104-66322005000200021 

LETTER TO THE EDITOR

 

Comment on 'Biosorption of Cadmium Using the Fungus Aspergillus niger.' by Barros, L.M., Macedo, G.R., Duarte, M.M.L., Silva, E.P. and Lobato, A.K.C.L.

 

 

Yuh-Shan Ho*

School of Public Health, Taipei Medical University, 250 Wu-Hsing Street, Taipei 11014, Taiwan, Phone: 886 2 2736 1661, ext 6514, Fax: 886 2 2738 4831 E-mail: ysho@tmu.edu.tw

 

 

In a recent publication Macedo et al. (2003), the section Results and Discussions, authors mentioned a pseudo-second-order Lagergren equation in Eq. (3). In fact, it is Ho (1995) who first developed a pseudo-second order kinetic expression for the adsorption systems of divalent metal ions using sphagnum moss peat. The earlier application of the pseudo-second order equation to the kinetic studies of competitive heavy metal adsorption by sphagnum moss peat was undertaken by Ho et al. (1996).

The pseudo-second order rate expression of Ho has also been applied to the sorption of metal ions, dyes, and organic substances from aqueous solutions (Table 1). In addition, discussion of the reaction order has been reported such as the comparison of chemisorption kinetic models (Ho and McKay, 1998a) and pseudo-second order model (Ho and McKay, 1999a). Furthermore, Ho's kinetic expression has also been applied to a multi-stage batch sorption design (Ho and McKay, 1999b) and a two-stage batch sorption optimized design (Ho and McKay, 1998b). Numerous applications of Ho's kinetic expression have been reported in recent years. A list of pseudo-second order systems is given in Table 1.

 

 

I suggest that Macedo et al. cite Ho's original pseudo-second order kinetic expression paper.

 

REFERENCES

Barros, L.M., Macedo, G.R., Duarte, M.M.L., Silva, E.P. and Lobato, A.K.C.L., Biosorption of cadmium using the fungus Aspergillus niger. Brazilian Journal of Chemical Engineering, 20, No. 3, 229 (2003).

Basso, M.C., Cerrella, E.G. and Cukierman, A.L., Activated carbons developed from a rapidly renewable biosource for removal of cadmium(II) and nickel(II) ions from dilute aqueous solutions. Industrial & Engineering Chemistry Research, 41, No. 2, 180 (2002).

Chiron, N., Guilet, R. and Deydier, E., Adsorption of Cu(II) and Pb(II) onto a grafted silica: Isotherms and kinetic models. Water Research, 37, No. 13, 3079 (2003).

Fu, Y.Z. and Viraraghavan, T., Removal of a dye from an aqueous solution by the fungus Aspergillus niger. Water Quality Research Journal of Canada, 35, No. 1, 95 (2000).

Fu, Y.Z. and Viraraghavan, T., Removal of CI Acid Blue 29 from an aqueous solution by Aspergillus niger. AATCC Review, 1, No. 1, 36 (2001).

Fu, Y. and Viraraghavan, T., Removal of Congo Red from an aqueous solution by fungus Aspergillus niger. Advances in Environmental Research, 7, No. 1, 239 (2002).

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Ho, Y.S., Adsorption of Heavy Metals from Waste Streams by Peat. Ph.D. Thesis, University of Birmingham, Birmingham, U.K. (1995).

Ho, Y.S., Removal of copper ions from aqueous solution by tree fern. Water Research, 37, No. 10, 2323 (2003).

Ho, Y.S. and Chiang, C.C., Sorption studies of acid dye by mixed sorbents. Adsorption-Journal of the International Adsorption Society, 7, No. 2, 139 (2001).

Ho, Y.S., Chiang, C.C. and Hsu, Y.C., Sorption kinetics for dye removal from aqueous solution using activated clay. Separation Science and Technology, 36, No. 11, 2473 (2001).

Ho, Y.S. and McKay, G., A comparison of chemisorption kinetic models applied to pollutant removal on various sorbents. Process Safety and Environmental Protection, 76, No. B4, 332 (1998a).

Ho, Y.S. and McKay, G., A kinetic study of dye sorption by biosorbent waste product pith. Resources Conservation and Recycling, 25, No. 3-4, 171 (1999d).

Ho, Y.S. and McKay, G., A multi-stage batch sorption design with experimental data. Adsorption Science & Technology, 17, No. 4, 233 (1999b).

Ho, Y.S. and McKay, G., A two-stage batch sorption optimised design for dye removal to minimum contact time. Process Safety and Environmental Protection, 76, No. B4, 313 (1998b).

Ho, Y.S. and McKay, G., Comparative sorption kinetic studies of dye and aromatic compounds onto fly ash. Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering, 34, No. 5, 1179 (1999c).

Ho, Y.S. and McKay, G., Kinetic models for the sorption of dye from aqueous solution by wood. Process Safety and Environmental Protection, 76, No. B2, 183 (1998e).

Ho, Y.S. and McKay, G., Pseudo-second order model for sorption processes. Process Biochemistry, 34, No. 5, 451 (1999a).

Ho, Y.S. and McKay, G., Sorption of dye from aqueous solution by peat. Chemical Engineering Journal, 70, No. 2, 115 (1998c).

Ho, Y.S. and McKay, G., The kinetics of sorption of basic dyes from aqueous solution by sphagnum moss peat. Canadian Journal of Chemical Engineering, 76, No. 4, 822 (1998d).

Ho, Y.S. and McKay, G., The kinetics of sorption of divalent metal ions onto sphagnum moss peat. Water Research, 34, No. 3, 735 (2000).

Ho, Y.S., Wase, D.A.J. and Forster, C.F., Kinetic studies of competitive heavy metal adsorption by sphagnum moss peat. Environmental Technology, 17, No. 1, 71 (1996).

Kapoor, A., Viraraghavan, T. and Cullimore, D.R., Removal of heavy metals using the fungus Aspergillus niger. Bioresource Technology, 70, No. 1, 95 (1999).

Krishnan, K.A. and Anirudhan, T.S., Removal of cadmium(II) from aqueous solutions by steam-activated sulphurised carbon prepared from sugar-cane bagasse pith: Kinetics and equilibrium studies. Water SA, 29, No. 2, 147 (2003).

Krishnan, K.A. and Anirudhan, T.S., Removal of mercury(II) from aqueous solutions and chlor-alkali industry effluent by steam activated and sulphurised activated carbons prepared from bagasse pith: Kinetics and equilibrium studies. Journal of Hazardous Materials, 92, No. 2, 161 (2002a).

Krishnan, K.A. and Anirudhan, T.S., Uptake of heavy metals in batch systems by sulfurized steam activated carbon prepared from sugarcane bagasse pith. Industrial & Engineering Chemistry Research, 41, No. 20, 5085 (2002b).

Krishnan, K.A., Sheela, A. and Anirudhan, T.S., Kinetic and equilibrium modeling of liquid-phase adsorption of lead and lead chelates on activated carbons. Journal of Chemical Technology and Biotechnology, 78, No. 6, 642 (2003).

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Özacar, M., Equilibrium and kinetic modelling of adsorption of phosphorus on calcined alunite. Adsorption-Journal of the International Adsorption Society, 9, No. 2, 125 (2003).

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Sag, Y. and Aktay, Y., Kinetic studies on sorption of Cr(VI) and Cu(II) ions by chitin, chitosan and Rhizopus arrhizus. Biochemical Engineering Journal, 12, No. 2, 143 (2002).

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Singh, S., Rai, B.N. and Rai, L.C., Ni(II) and Cr(VI) sorption kinetics by Microcystis in single and multimetallic system. Process Biochemistry, 36, No. 12, 1205 (2001).

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* To whom correspondence should be addressed

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