Freundlich equation

This research was undertaken to characterize the ability of natural zeolite and bentonite minerals to adsorb and release zinc and manganese. The potentials for sorption of these ions were evaluated by applying the Langmuir and Freundlich equations.

6p schindler 30-12-2021 7 0   Download

CO2 adsorption capacities of activated carbon-based adsorbents subjected to different treatments, such as HNO3 oxidation, air oxidation, alkali impregnation, and heat treatment under helium gas atmosphere, were determined by gravimetric analyses and reported previously by our group. In the current work, the experimental adsorption isotherms of these modified activated carbon samples were fitted to Langmuir, Freundlich, and Dubinin–Radushkevich (D-R) models.

12p langthannam 29-12-2021 7 0   Download

In this research, rice husk, abandoned and available agriculture waste, were developed into activated carbon using microwave methods. The optimal experimental parameters such as pH, contact time, activated carbon dose, and temperature were investigated. The activated carbon was characterized by scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) analysis. The maximum adsorption capacities toward methylene blue was 6.13 mg g-1 . The experimental data fitted the Freundlich equation well, although the Langmuir equation could also describe them.

5p caygaocaolon11 18-04-2021 13 2   Download

Soil Samples are collected for Phosphorus Adsorption behavior from three representative soils of Chhattisgarh which belong to the Inceptisol, Alfisol and Vertisol. Two adsorption equation viz., Langmuir and Freundlich were used to describe P adsorption behavior. The P adsorption at the solid phase was strongly related to its concentration in the solution phase and Vertisol with maximum clay content recorded highest P adsorption at a given equilibrium P concentration indicating that P ions are most tightly held by Vertisol.

6p angicungduoc8 07-11-2020 5 1   Download

A laboratory study was undertaken to investigate the P adsorption behavior of three representative soils of Chhattisgarh belonging to the order Inceptisol, Alfisol and Vertisol.

6p angicungduoc8 07-11-2020 13 1   Download

The present investigation was planned to monitor the adsorption-desorption of applied S in soils using Langmuir and Freundlich adsorption isotherm equation.

9p trinhthamhodang1215 23-09-2020 10 2   Download

The laboratory experiment was conducted at Department of Soil Science and Agricultural Chemistry, Banaras Hindu University, Varanasi, Uttar Pradesh, India. In this experiment, the adsorption of nitrate onto soils of different cropping systems viz. rice-wheat(R-W), rice-vegetable (R-V), pulse-pulse (P-P) and sugarcane(S) was carried out in a batch equilibrium system. Surface soil samples were collected for adsorption study from each cropping system. Results showed that the adsorption isotherms were L- type (Langmuir type) in most of the soils.

8p nguathienthan4 18-04-2020 16 0   Download

This study applies the development and application of low cost, Punica granatum bio- adsorbent for the removal of fluoride in groundwater. The batch adsorption study was carried out to analyze the defluoridation by contact time variation, adsorbent dose, adsorbate concentration, adsorbent particle size and presence of coanions at neutral pH. The analysis of the isotherm equilibrium data using the Langmuir and Freundlich equations by linear methods showed that the data fitted better with Freundlich model (R 2 0.980).

9p mentospurefresh 29-11-2019 18 1   Download

In this study, the adsorption behavior of some low-cost adsorbents such as peanut husk charcoal, fly ash, and natural zeolite, with respect to Cu2+, and Zn2+ ions, has been studied in order to consider its application to the purification of metal finishing wastewater. The batch method was employed: parameters such as pH, contact time, and initial metal concentration were studied. The influence of the pH of the metal ion solutions on the uptake levels of the metal ions by the different adsorbents used were carried out between pH 4 and pH 11.

7p kethamoi1 20-11-2019 20 0   Download

In the present study Terminalia chebula was used as an eco-friendly natural colorant for sustainable textile coloration of woolen yarn with primary emphasis on thermodynamic and kinetic adsorption aspects of dyeing processes. Polyphenols and ellagitannins are the main coloring components of the dye extract. Assessment of the effect of pH on dye adsorption showed an increase in adsorption capacity with decreasing pH. Effect of temperature on dye adsorption showed 80 C as optimum temperature for wool dyeing with T. chebula dye extract.

10p kequaidan1 16-11-2019 22 0   Download

The adsorption of Ni2+ was carried out onto composite in aqueous solution via varying pH, contact time and its initial concentration. The experimental adsorption data fitted into Freundlich adsorption isotherm model (r2 = 0.9898) better than into Langmuir one (r2 = 0.6764). The adsorption followed pseudo-second order kinetic model very well (r2 = 0.9976). The maximum adsorption capacity of that composite was 66.67 mg/g which calculated from the pseudoLangmuir equation.

5p giesumanh 04-11-2018 44 0   Download

The adsorption of phenol over MCM-41 prepared from rice husk silica was investigated. MCM-41 material (RH-MCM-41) was synthesized using sodium silicate prepared from rice husk as a silica source and cetyltrimetylammoniumbromide (CTAB) as a surfactant with the following gel composition: 1SiO2: 0.106CTAB: 0.03NaOH: 150H2O. The obtained material was characterized by XRD and BET. RH-MCM-41 exhibits high surface area and highly ordered hexagonal mesoporous structures. The adsorption of phenol over RH-MCM-41 fit well to both Langmuir and Freundlich isothermers.

7p uocvong03 24-09-2015 85 12   Download