The authors regret that the following references were omitted from their original paper and apologise for any inconvenience caused:

‘These kinetic models are expressed by the following equations: 
formula
3
(pseudo-first order) (Lagergren 1898) 
formula
4
(pseudo-second order) (Ho et al. 1996; Ho & Mckay 1998)’

REFERENCES

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McKay
G.
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Y. S.
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D. A. J.
Forster
C. F.
1996
Kinetic studies of competitive heavy metal adsorption by sphagnum moss peat
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77
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Lagergren
S.
1898
About the theory of so-called adsorption of soluble substances. Kungliga Svenska Vetenskapsakademiens
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