A derivation of Langmuir's adsorption isotherm

Bird, Paul G.

doi:10.1021/ed010p237

Cited by 6 publications

(5 citation statements)

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“…By drawing a curve with C ssDNA / I versus C ssDNA , where C ssDNA is the concentration of ssDNA and I is the FL intensity of MEH-PPV in Figure b, we found that a linear relationship existed (see the inset of Figure b). This result resembles the Langmuir adsorption isotherm, , indicating that the binding of ssDNA to PLL coincides with the Langmuir adsorption model.…”

Section: Resultssupporting

confidence: 72%

Fluorescence Resonance Energy Transfer in a Binary Organic Nanoparticle System and Its Application

Wang

et al. 2015

ACS Appl. Mater. Interfaces

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Fluorescent organic nanoparticles have a much better photostability than molecule-based probes. Here, we report a simple strategy to detect chemicals and biomolecules by a binary nanoparticle system based on fluorescence resonance energy transfer (FRET). Poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO, energy donor) and poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV, energy acceptor) are utilized to prepare the binary nanoparticle system through a reprecipitation method. Since the FRET process is strongly distance-dependent, a change in the interparticle distance between the two kinds of nanoparticles after introduction of analytes will alter the FRET efficiency. The response of the binary nanoparticle system to cationic polyelectrolytes was investigated by monitoring the FRET efficiency from PFO to MEH-PPV nanoparticles and the fluorescence color of the nanoparticle solutions. Furthermore, the cationic polyelectrolyte pretreated binary nanoparticle system can be used to detect DNA by desorption of nanoparticles from the polyelectrolyte's chains and the detection concentration can go down to 10(-14) M. Thus, the binary nanoparticle system shows great promise for applications in chemical sensing or biosensing.

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Section: Resultssupporting

confidence: 72%

Fluorescence Resonance Energy Transfer in a Binary Organic Nanoparticle System and Its Application

Wang

et al. 2015

ACS Appl. Mater. Interfaces

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“…The R 2 values for both Langmuir fits (Figure S8A) were near or above 0.99, indicating that the isotherms for both can be well fit with Langmuir modeling, an assumption for which is monolayer adsorption. 61 The Langmuir q max values for fibers of Methods 1 and 2 are 675.4 mg g −1 (30% of theoretical adsorption maximum) and 1285.5 mg g −1 (50% of theoretical adsorption maximum), respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…To model the fibers of Methods 1 and 2, linearized fitting curves for three different isotherm models (Langmuir, Freundlich, and Temkin) are presented in Figure S8 along with the methods used for the fittings. The R 2 values for both Langmuir fits (Figure S8A) were near or above 0.99, indicating that the isotherms for both can be well fit with Langmuir modeling, an assumption for which is monolayer adsorption . The Langmuir q max values for fibers of Methods 1 and 2 are 675.4 mg g –1 (30% of theoretical adsorption maximum) and 1285.5 mg g –1 (50% of theoretical adsorption maximum), respectively.…”

Section: Resultsmentioning

confidence: 99%

Tunable Molybdenum Disulfide-Enabled Fiber Mats for High-Efficiency Removal of Mercury from Water

Fausey

Zucker

Lee

et al. 2020

ACS Appl. Mater. Interfaces

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The application of molybdenum disulfide (MoS2) for water decontamination is expanded toward a novel approach for mercury removal using nanofibrous mats coated with MoS2. A bottom-up synthesis method for growing MoS2 on carbon nanofibers was employed to maximize the nanocomposite decontamination potential while minimizing the release of the nanomaterial to treated water. First, a co-polymer of polyacrylonitrile and polystyrene was electrospun as nanofibrous mats and pretreated to form pristine carbon fibers. Next, three solvothermal methods of controlled in situ MoS2 growth of different morphologies were achieved on the surface of the fibers using three different sets of precursors. Finally, these MoS2-enabled fibers were extensively characterized and evaluated for their mercuric removal efficiency. Two mercury removal mechanisms, including reduction–oxidation reactions and physicochemical adsorption, were elucidated. The two nanocomposites with the fastest (0.436 min–1 mg–1) and highest mercury removal (6258.7 mg g–1) were then further optimized through intercalation with poly(vinylpyrrolidone), which increased the MoS2 interlayer distance from 0.68 nm to more than 0.90 nm. The final, optimal fabrication technique (evaluated according to mercuric capacity, kinetics, and nanocomposite stability) demonstrated five times higher adsorption than the second-best method and obtained 70% of the theoretical mercury adsorption capacity of MoS2. Overall, results from this study indicate an alternative, advanced material to increase the efficiency of aqueous mercury removal while also providing the basis for other novel environmental applications such as selective sensing, disinfection, and photocatalysis.

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“…18 Adsorption isotherm equations can be used to describe the dependence of h eq on impurity concentration c i . Isotherm models that are used to describe and analyze data on growth kinetics in the presence of impurities include those of Langmuir, 19,20 To ´th 21 and Freundlich, 22 but for its simplicity, the Langmuir adsorption isotherm is customarily used. However, in a previous study of the adsorption of a polymer onto drug crystals, it has been observed that values may deviate from the Langmuir model especially at low polymer concentrations.…”

Section: Surface Coverage -Adsorption Isotherm Modelmentioning

confidence: 99%

Inhibition of solution crystal growth of ritonavir by cellulose polymers – factors influencing polymer effectiveness

et al. 2012

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A derivation of Langmuir's adsorption isotherm

Cited by 6 publications

References 0 publications

Fluorescence Resonance Energy Transfer in a Binary Organic Nanoparticle System and Its Application

Fluorescence Resonance Energy Transfer in a Binary Organic Nanoparticle System and Its Application

Tunable Molybdenum Disulfide-Enabled Fiber Mats for High-Efficiency Removal of Mercury from Water

Inhibition of solution crystal growth of ritonavir by cellulose polymers – factors influencing polymer effectiveness

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