This letter is a response to the comment of Dr. Ho on "Adsorption of direct dyes from aqueous solutions by carbon nanotubes: Determination of equilibrium, kinetics and thermodynamics parameters." First, we would like to thank Dr. Ho for his interest in, and kind comments on, our recent article [C.Y. Kuo, C.H. Wu, J.Y. Wu, J. Colloid Interface Sci. 327 (2008) 308]. This reply responds to the issues raised by Dr. He. We will indicate the miscitation of the intraparticle diffusion model and clarify the correct citation of the pseudo-second-order model. (c) 2009 Elsevier Inc. All rights reserved.