Adsorption isotherm models and error analysis for single and binary adsorption of Cd(II) and Zn(II) using leonardite as adsorbent

In the present work, Saccharum bengalense (SB) was treated with sulfuric acid to enhance its efficiency. Methyl violet (MV), a cationic dye, was removed from aqueous medium using acid modified S. bengalense (A-SB). Different parameters like adsorbent dosage, stirring speed, temperature, contact time and effect of initial concentration of dye on rate of adsorption of dye from aqueous medium was studied. Experimental data obtained from adsorption of MV was analyzed by applying pseudo first order, pseudo second order and intra-particle diffusion models and it was found that the data best follows the pseudosecond order kinetics. Thermodynamic parameters indicate that adsorption reaction was spontaneous, feasible and endothermic in nature. Different adsorption isotherm models, like Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin, were used to study the mechanism of adsorption process and experimental data was well fitted by the Langmuir adsorption isotherm.

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Thermodynamic study of Iron (III) removing by the synthesized α-Alumina powder and evaluating the corresponding adsorption isotherm models using Response Surface Method

Arabian Journal of Chemistry ◽

10.1016/j.arabjc.2019.07.006 ◽

2020 ◽

Vol 13 (2) ◽

pp. 4254-4262

Author(s):

Mostafa Rajabzadeh ◽

Hossein Aghaie ◽

Hamed Bahrami

Keyword(s):

Adsorption Isotherm ◽

Response Surface ◽

Response Surface Method ◽

Thermodynamic Study ◽

Isotherm Models ◽

Alumina Powder ◽

Surface Method ◽

Adsorption Isotherm Models

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Influence of Salinity on the Removal of Ni and Zn by Phosphate-Intercalated Nano Montmorillonite (PINM)

Minerals ◽

10.3390/min10110980 ◽

2020 ◽

Vol 10 (11) ◽

pp. 980

Author(s):

Jiyeon Choi ◽

Ardie Septian ◽

Won Sik Shin

Keyword(s):

Langmuir Model ◽

Permeable Reactive Barrier ◽

Isotherm Models ◽

Binary Adsorption ◽

Adsorption Parameters ◽

Ideal Adsorbed Solution Theory ◽

Adsorption Isotherm Models ◽

Adsorption Data ◽

Best Fitting ◽

P Factor

The salinity influence on the adsorptions of Ni and Zn onto phosphate-intercalated nano montmorillonite (PINM) were investigated. Single adsorption isotherm models fitted the single adsorption data well. The adsorption capacity of Ni was higher than that of Zn onto PINM at different salinities. The single adsorption parameters from Langmuir model (QmL and bL) were compared with the binary adsorption (QmL* and bL*). The QmL* of Zn was lower than that of Ni. The simultaneous presence of Ni and Zn decreased the adsorption capacities. The single and binary adsorptions onto PINM were affected by the salinity. The competitive Langmuir model (CLM), P-factor, Murali and Aylmore (M−A) models, and ideal adsorbed solution theory (IAST) were satisfactory in predicting the binary adsorption data; the CLM showed the best fitting results. Our results showed that the PINM can be used as an active Ni and Zn adsorbent for a permeable reactive barrier (PRB) in the remediation of saline groundwater.

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