Results 271 to 280 of about 200,321 (289)

Adsorption kinetics models in clay systems. The critical analysis of pseudo-second order mechanism

Applied Clay Science, 2020
Abstract The research topics involving adsorption kinetics of chemical substances on clays and related materials include hundreds of papers over the last decades. In many of them, it is concluded that the adsorption is governed by the so-called pseudo-second order (PSO) mechanism.
openaire   +1 more source

Biosorption of Cr(VI) onto marine Aspergillus niger: experimental studies and pseudo-second order kinetics

World Journal of Microbiology and Biotechnology, 2009
The removal of hexavalent chromium from aqueous solution was studied in batch experiments using dead biomass of three different species of marine Aspergillus after alkali treatment. All the cultures exhibited potential to remove Cr(VI), out of which, Aspergillus niger was found to be the most promising one.
Yasmin Khambhaty, Kalpana Mody, Shaik Basha, Bhavanath Jha   +3 more
openaire   +1 more source

Dynamic studies and pseudo-second order modeling of copper(II) biosorption onto pine cone powder

Desalination, 2010
Abstract The chemical interaction between biosorbent functional groups and metal ion species in solution can slightly be altered by chemical treatment of biosorbent surface. The biosorbent kinetics and mechanism for copper(II) biosorption onto pine cone powder and 0.15 mol dm − 3 NaOH treated pine cone powder were determined during batch kinetics ...
A.E. Ofomaja, E.B. Naidoo, S.J. Modise
openaire   +1 more source

Pseudo-Second-Order Kinetics for the Adsorption of Uranyl Ion onto Peat at Different pH Value

Advanced Materials Research, 2010
Batch tests were used to investigate the effects of pH and contact time on the adsorption capability of peat. The results indicate that adsorption of uranyl ions on peat increase with increasing pH from 1 to 5. However it takes longer contact time to reach the adsorption equilibrium with increase of pH from 1 to 5.
Zhi Rong Liu, Qin Qin Tao, Chuan Xi Wen
openaire   +1 more source

Pseudo-Second-Order Kinetic Equation for Describing the Effect of Sorbent and Sorbate Concentrations

Langmuir
The sorbent concentration (Cs) effect and sorbate initial concentration (C0) effect are common phenomena observed in the study of adsorption kinetics at solid-liquid interfaces. That is, adsorption rate constants simulated with classical kinetic equations, such as the pseudo-second-order (PSO) model, for a given system vary with Cs and C0.
Hongfei Wang, Lingxi Zhao, Wanguo Hou
openaire   +2 more sources

Modelling the solid–liquid adsorption processes using artificial neural networks trained by pseudo second order kinetics

Chemical Engineering Journal, 2009
Abstract A three-layer feed forward neural network was constructed and tested to analyze the second order kinetics of solid–liquid adsorption process. The pseudo second order kinetics of auramine O onto activated carbon was used to train the artificial neural network (ANN) to model the sorption system for various operating conditions.
K. Vasanth Kumar, K. Porkodi
openaire   +1 more source

Langmuir Isotherm and Pseudo Second Order Kinetic Model for the Biosorption of Methylene Blue Onto Rice Husk

2008 2nd International Conference on Bioinformatics and Biomedical Engineering, 2008
A comparison was made of the linear least-squares method and a nonlinear least-square method of the Langmuir isotherm and pseudo second order kinetic model for the biosorption of methylene blue onto rice husk. The parameters obtained from the linear method and the nonlinear method were different. The error analysis was performed.
Runping Han, Yinli Li, Jingjing Zhang, Lijun Zhang, Fuling Xie, Junmei Cheng, Zhenhui Zhao   +6 more
openaire   +1 more source

Sorption kinetics: Obtaining a pseudo-second order rate equation based on a mass balance approach

Journal of Environmental Chemical Engineering, 2014
Abstract Various formulations of pseudo second-order rate equations have been widely used in elucidating the rate constants of a wide variety of sorption systems. In this paper, it is shown that a new formulation can be obtained by making use of the mass balance equation of a single stage batch-type system.
openaire   +1 more source

Pseudo second order kinetic models for safranin onto rice husk: Comparison of linear and non-linear regression analysis

Process Biochemistry, 2006
Kinetic experiments were carried out for the sorption of safranin onto rice husk particles. The kinetic data were fitted to pseudo second order model of Ho, Sobkowsk and Czerwinski, Blanachard and Ritchie by linear and non-linear regression method. Non-linear method was found to be a better way of obtaining the parameters involved in the second order ...
K. Vasanth Kumar, S. Sivanesan
openaire   +1 more source

Adsorption kinetics at solid/aqueous solution interfaces: On the boundaries of the pseudo-second order rate equation

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2020
Abstract The empirical pseudo-second order rate equation has become the equation of choice to account for adsorption kinetics at solid/aqueous solution interfaces. However, its validity boundaries still remain faint. Here, they are set on the basis of the predictions of the well-established Langmuir model, cast in terms of the relevant kinetic ...
openaire   +1 more source