All data for the Pseudo-Second-Order kinetic model are noted with a subscript 2. The Pseudo-Second-Order kinetic model have graphs of types 1 to 4 as mentioned in Section 2.7.2. The graph types that were best correlated to the biosorbents and described the adsorption process the best were selected for the discussion.

Three sorption kinetic models are presented in this paper and have been used to test 11 of the literature systems previously reported as first order kinetics and one system previously reported as a second order process. In all 12 systems, the highest correlation coefficients were obtained for the pseudo-second order kinetic model.

Pseudo-second order model for sorption processes Y.S. Ho, G. McKay * Department of Chemical Engineering, The Hong Kong Uni6ersity of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People’s Republic of China Received 2 October 1997; received in revised form 10 August 1998; accepted 16 August 1998 Abstract

06/03/2013 · The applicability of the pseudo-second order equation (PSOE) has been explained on the ground of the model assuming that the overall sorption rate is limited by the rate of sorbate diffusion in the pores of sorbent (intraparticle diffusion model).

the adsorbent. In these adsorption kinetic models, the pseudo- second-order kinetic models is the most popular model and have been commonly applied in many adsorption kinetic studies. Numerous altered equation expression of the pseudo-second-order model were derived to simplify the calculation diffcultyduring the past few decades.

Pseudo-second-order model (3 mg/L P concentration) was R 2 2=0.999 and R 2 2= 0.997 for 10 mg/L P concentration which confirms that the TMS adsorption data well represented by the pseudo-second-order kinetic model for P adsorption. Soils containing higher percentage of clay, CEC, and organic matter adsorbs more P.

The pseudo-second-order kinetic model was used to fit the kinetic data, providing a good correlation with the experimental data. The results of a thermodynamic study showed that the activation energies (EA) were 3.75 and 1.75 kJ mol-1 for the adsorption of Cu (II) and Zn (II) on to CMDS at pH 5.5.