Freundlich model

A high-speed dispersion homogenization-assisted alkali fusion-hydrothermal method was successfully developed for the preparation of NaA zeolite molecular sieve with excellent adsorption performance for ammonia nitrogen using solid waste fly ash. This study establishes a vital research foundation for the utilization of fly ash and the treatment of ammonia nitrogen wastewater, with great ecological and social benefits.

8p visergeyne 18-06-2024 0 0   Download

Contaminants in plating wastewater are hard to remove, especially hexavalent chromium ions. This waste stream contains a large amount of Cr6+, a highly toxic metal, potential to cause cancer. To reduce this pollution, sludge from a supply water treatment plant (DWTS) has been used to make adsorbent.

13p viannee 02-08-2023 3 3   Download

In study "Using quail eggshell to treat methylene blue in aqueous solution", the raw quail eggshell powder (RQEP) was utilized as a cheap and environmentally friendly adsorbent to remove methylene blue (MB) from aqueous media under different conditions. The morphology of the prepared adsorbent was determined by scanning electron microscopy. The Langmuir and Freundlich isotherm models were used to model the adsorption data. The obtained results showed that the adsorption of MB on RQEP was well-fitted with the Freundlich model.

8p nhanchienthien 25-07-2023 4 3   Download

In this study, the sugarcane bagasse grafted with citric acid was used as a low-cost biosorbent for removal of dyes from the textile wastewater. The adsorption parameters such as initial pH values, dyes concentrations, adsorbent dosages and contact times were investigated by the batch experiments. The Freundlich and Langmuir adsorption isotherm models were used to evaluate the experimental data.

6p vidoctorstrange 06-05-2023 6 2   Download

In the work "Adsorption behavior of Pb(II) in aqueous solution using coffee husk-based activated carbon modified by nitric acid", activated carbon (AC) was prepared from coffee husk and modified by nitric acid for effective lead ions removal from aqueous solution. The as-prepared samples have uniform particles size, developed surface area and contain acidic surface functional groups. Nitric acid modification showed a pronounced effect on improving Pb(II) adsorption capacity.

10p runordie3 27-06-2022 9 2   Download

Chitosan-magnetite composite (CS-MNPs) was made by an in-situ combined co-precipitation method. Material characteristics were investigated by X-ray, SEM, BET, and VSM methods. CS-MNPs has a spherical shape with a diameter of around 20 nm and a surface area of 119.43 m2 /g.

8p viirenerosenfeld 02-06-2022 11 1   Download

In addition to reduction, MB decolorization mainly results from adsorption on the surface of GdB6 based on the adsorption-desorption tests. The adsorption behavior follows the pseudo-second-order kinetics and Freundlich isotherm model.

8p thebadguys 15-01-2022 37 0   Download

The sorption isotherms were best described by the Freundlich model rather than Langmuir or linear models. We determined that using wood fibre in constructed wetlands would require around 35–66% less area to remove the selected micropollutants, compared to soil as matrix. Thus our results show the potential of using hydroponic substrata such as wood - and coconut fibre to both remove micropollutants in, and reduce the footprint of constructed wetlands.

10p thebadguys 15-01-2022 14 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

This study deals with the adsorption of two pesticides, carbendazim and flumetsulam, from aqueous solutions onto four homoionic-montmorillonite clays (Ag+, Zn2+, Cu 2+, and H+). Equilibrium adsorption isotherm data were analyzed using Freundlich, Dubinin–Radushkevich, and Temkin isotherms. Linear and nonlinear fitting methods were compared to determine the best-fitting isotherms for the experimental data. Three error analysis methods were used to evaluate the data for each method: the coefficient of determination (R2), sum of squared errors (SSE), and chi-square test (χ2).

11p tudichquannguyet 29-11-2021 8 1   Download

A novel adsorbent Fe3O4/Ni/NixB nanocomposite was synthesized and used for the adsorption of copper. Moreover, natural adsorbents carob and grape seeds were used for this purpose. The surfaces and the elemental compositions of the adsorbents were characterized by SEM-EDX. The zero point charges of pH of Fe3O4/Ni/NixB nanocomposite, carob, and grape seeds were found as 8.4, 6.0, and 5.6, respectively. The Langmuir, Freundlich, and Dubinin–Radushkevich isotherm models were used for the identification of the mechanism of the adsorption.

13p tudichquannguyet 29-11-2021 13 1   Download

Resins coated with nickel/nickel boride nanoparticles were used to remove brilliant green, methyl violet, methylene blue, phenosafranine, and brilliant cresyl blue from water. The effects of pH, adsorbent dose, contact time, and initial dye concentration on the adsorption efficiencies were investigated. The point of zero charge for the adsorbent was pH 9.5. Isotherm studies were conducted using Langmuir, Freundlich, and Dubinin–Radushkevich models, and thermodynamic studies were also performed. Adsorption of the five dyes was found to obey the Langmuir isotherm model and was endothermic.

15p tudichquannguyet 29-11-2021 25 1   Download

The aim of this work was to prepare biodegradable starch aerogels as drug carriers. The effective parameters in the synthesis and the optimal values of these parameters were determined using Minitab experimental design software. Ibuprofen was selected as a model drug for the dissolution study and loaded into optimized aerogel during the last solvent exchange step. The Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that ibuprofen has been successfully loaded into the aerogel matrix without any effect on the aerogel nature. The drug loading was calculated to be 29%.

20p tudichquannguyet 29-11-2021 13 1   Download

The removal of bromothymol blue (BTB) from aqueous solution was studied by electrocoagulation (EC) technique using aluminum electrodes. The various experimental conditions known to influence the EC process were parameterized, including the effects of temperature, concentration, current density, pH, and treatment time. The results obtained have shown that optimum removal efficiency of 99.9% was realized at a current density of 20 mA/cm2 and pH of 4.7. The adsorption process showed a pseudo-first-order kinetic model as the best fit to the EC data.

21p tudichquannguyet 29-11-2021 15 1   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

This study reported adsorption capacity of Zn2+ on Phuoc Long basalt, Vietnam in comparison with powder activated carbon (PAC). The adsorption of Zn2 from aqueous solution on basalt and PAC was investigated in aqueous solution of pH: 4.51/4.67, at temperature of 31 - 0.50C.

8p larachdumlanat127 20-12-2020 13 1   Download

Kinetics, thermodynamics and equilibrium of the removal of chromium(VI) ions from aqueous solutions by using chemically activated leaves of Ficus nitida were investigated. Adsorption runs were performed as a function of pH, mass of biosorbent, contact time, initial concentration of chromium(VI) ions and temperature.

7p vijiraiya2711 27-05-2020 20 0   Download

In this study, a novel metal-organic framework (M-ZIF-8@ZIF-67) was successfully prepared using the single layer Fe3O4-ZIF-8 as magnetic core and wrapped a layer of ZIF-67 outer. This M-ZIF-8@ZIF-67 was employed as an adsorbent for the adsorption and removal of fipronil and its metabolites from environmental water and cucumber samples. The characterization results suggested that M-ZIF-8@ZIF-67 has the double layer structure a polyhedral structure with uniform pores, while ZIF-67 was successfully coated on the surface of Fe3O4-ZIF-8.

8p partimesinhvien 08-05-2020 26 3   Download

Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with 0.125 mol/L NaOH) for Cd, Pb, Ni, increase d by 0.51, 0.70 and 0.32 mmol/g, respectively. When the NaOH concentration for ATSS preparation increase d from 0.125 mol/L to 0.

7p mentospurefresh 29-11-2019 17 1   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