Comparison of Langmuir and Freundlich adsorption equations within the SWAT-K model for assessing potassium environmental losses at basin scale

Wang, Chunying; Boithias, Laurie; Ning, Zhiliang; Han, Yuping; Sauvage, Sabine; Sánchez‐Pérez, José‐Miguel; Kuramochi, Kanta; Hatano, Ryusuke

doi:10.1016/j.agwat.2016.08.001

Cited by 66 publications

(36 citation statements)

References 14 publications

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“…Unlike the Langmuir, the Freundlich isotherm model assumes that the uptake of adsorbate occurs on a heterogeneous surface and that the amount of the adsorbate adsorbed increases infinitely with an increasing concentration [41]. The removal of Ace by the MWCNT was studied using the Freundlich model in Equation (6):…”

Section: Adsorption Isothermmentioning

confidence: 99%

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Lin

Kurniawan

Albadarin

et al. 2018

Journal of Molecular Liquids

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This study investigates the technical feasibility of MWCNTs for acetaminophen (Ace) removal from synthetic wastewater in batch mode. To improve their removal performance, the surface of the MWCNTs was chemically modified with NaOH, HNO 3 /H 2 SO 4 , ozone and/or chitosan. The effects of pertinent parameters such as reaction time, dose, pH, and agitation speed on the Ace removal were evaluated. Their removal performance on Ace was compared to those of previous studies. The adsorption mechanisms of Ace removal by the MWCNTs are also presented. It is evident from this study that after chemical modification on its surface, the treated nano-adsorbent significantly enhanced Ace removal from wastewater. Among all types of those adsorbents, the ozone-treated MWCNT stands out for the highest Ace removal (95%) under the same initial Ace concentration of 10 mg/L. Their adsorption capacities, applicable to the Freundlich isotherm model, are listed as: ozone-treated MWCNT (250 mg/g) > chitosan-coated MWCNT (205 mg/g) > acid-treated MWCNT (160 mg/g) > NaOH-treated MWCNT (130 mg/g) > as-received MWCNT (90 mg/g). Although the ozone-treated MWCNT has the most outstanding performance in Ace removal, its treated effluent still could not meet the required effluent limit of less than 0.2 mg/L set by China's legislation. This suggests that further treatment using biological processes needs to be carried out to complement Ace removal from the wastewater samples.

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Section: Adsorption Isothermmentioning

confidence: 99%

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Lin

Kurniawan

Albadarin

et al. 2018

Journal of Molecular Liquids

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“…The results show that the correlation coefficient R2 = 0.9977 of Langmuir is the highest, and the saturated adsorption capacity calculated by the Langmuir model is very near to the experimental value. So the surface adsorption between imprinted polymer and acid amide components fit well with the Langmuir adsorption equation which means that the adsorption of acid amide components by the MIP is a monolayer adsorption process, and the adsorption is well distributed .…”

Section: Resultsmentioning

confidence: 98%

Preparation and characterization of molecularly‐imprinted polymers for extraction of sanshool acid amide compounds followed by their separation from pepper oil resin derived from Chinese prickly ash (Zanthoxylum bungeanum)

Chen

Jin

Yao

et al. 2017

J of Separation Science

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Molecularly imprinted polymers were prepared using the molecular structure analogs of sanshool as template molecule, 2-vinylpyridine and β-cyclodextrin as double functional monomers, ethylene dimethacrylate as cross linker, and azobisisobutyronitrile as initiator. The structural characteristics of the polymers were determined by Fourier-transform infrared spectroscopy and scanning electron microscopy. Dynamic adsorption and isothermal adsorption were also investigated. The molecularly imprinted polymers were used to prepare a molecularly imprinted solid-phase extraction column in order to separate acid amide components from pepper oil resin derived from Chinese prickly ash (Zanthoxylum bungeanum). After eluting, the percentage of acid amide components was enhanced to 92.40 ± 1.41% compared with 23.34 ± 1.21% in the initial pepper oil resin, indicating good properties of purification of molecularly imprinted polymers and potential industrial application.

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“…There are two models for static adsorption: Freundlich model and Langmuir model. The Freundlich isotherm adsorption formula could be expressed in linear forms as follows eq. :

\lg q_{e} = \lg K_{F} + \frac{1}{n} \lg C_{e}

where q e (μg cm −2 ) is the equilibrium adsorption amount of the MNCM; C e is the adsorption amount of putrescine (mg mL −1 ) when the MNCM adsorption equilibrium; n is the constant related to adsorption; and K F is the Freundlich constant.…”

Section: Methodsmentioning

confidence: 99%

Molecular imprint enhanced specific adsorption visualization on electrospun chromogenic membrane for efficient detection of putrescine

Ying

Kang

Zhu

et al. 2019

J of Applied Polymer Sci

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Electrospinning is an important tool for generating continuous fibers with large surface area and high pore ratio. The combination of nanofiber membrane and molecular imprinting can effectively measure specific adsorption of putrescine with coloring procedure. In this work, molecularly imprinted electrospun chromogenic membrane was synthesized with 1,4-butanediol (BDO) as imitate template. Poly(vinyl alcohol) (PVA) is used as spinning solution and ninhydrin as chromogenic agent for visualizing detection of target molecular putrescine. The adsorption concentration on molecularly imprinted polymer is illustrated by blue-purple colored stains and recorded by interactive three-dimensional surface plot of ImageJ. The results indicated that a uniform and bead-free PVA nanofiber was obtained using 10% (w/w) PVA solution, 15 kV voltage, 15 cm spinning distance, and 600 rpm roller speed. Also, the adsorption performance of molecular imprinting chromogenic membrane was investigated in detail, showing a higher adsorption capacity of 33.16 μg cm −2 and maximum imprinting efficiency of 2.30 under the best recognition conditions of 315 μL ninhydrin, 0.25% (w/w) BDO, and 0.4 cm sensing distance, as well as a short adsorption equilibrium time of 40 min. In addition, three amine competitors were discussed to reveal the better selectivity and higher specific recognition ability in the imprinted membrane.HIGHLIGHTS : • The molecular imprinting and coloring structure is constructed in nanofiber membrane with an enhanced specific surface area.• The adsorption on imprinted membrane is visualized by chromogenic reaction between putrescine and ninhydrin to form a threedimensional interactive surface proceeded using the ImageJ software. • The imprinted nanofiber membrane with large area and high pore ratio is applied in detecting target in trace concentration within shortened time.

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Comparison of Langmuir and Freundlich adsorption equations within the SWAT-K model for assessing potassium environmental losses at basin scale

Cited by 66 publications

References 14 publications

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Preparation and characterization of molecularly‐imprinted polymers for extraction of sanshool acid amide compounds followed by their separation from pepper oil resin derived from Chinese prickly ash (Zanthoxylum bungeanum)

Molecular imprint enhanced specific adsorption visualization on electrospun chromogenic membrane for efficient detection of putrescine

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