I am working on iron oxide nanoparticles for adsorption of dye. I have doubt in making the Langmuir and freundlich isotherm. I specifically wanted to know how we can calculate this isotherm by BET surface analyser.
Dear Dr. Aditya,
Nice question you asked. In my opinion the best way to detect and calculate adsorption isotherm models is "the effect of dye concentration". Adsorption models helps to know the adsorption mechanism of dye onto the surface of nano Iron oxide or any other materials and the mechanism may be chemisorption or physical adsorption depending on other operating condition as pH and point of zero charge and/or contaminants behavior. SO, The BET doesn't cover all of these conditions.
Yours'
Ahmed
@Ahmed Said Mahmoud Sir thank you very much for your answer.
So can we get Langmuir and freundlich isotherm through UV Visible spectroscopy analysis?
Like for example calculating the "Ce" .i.e the equilibrium adsorption, which we get by putting the absorbance value (got after UV Visible spectroscopy) of remaining dye solution in the supernatant after adsorption. And then afterwards from the linear equation obtained from standard calibration curve of the dye we can get "Ce" and thus we can get thus the other values required for isotherm. Please suggest me if the procedure I wrote above is correct way to calculate Langmuir and freundlich isotherm.
Dear Dr. Aditya,
1. Prepare different dye concentrations
2. Treat it using optimum pH, nano dose, stirring, etc.
3. Measure the final dye concentration Ce.
4. Calculate Qe based on dose and volume used in the batch experiment.
5. Draw the linear or non linear relations.
6. Ensure most of point used present in the linear curve.
7. Measure intercept and slope.
8. Calculate calculated Qe based on previous data to ensure the reality of results.
9. Discuss the adsorption of dye onto nano surface based on highly identity model (The best R^2).
Yours'
Ahmed
We obtain isotherms by experiment. We calculate the parameters of isotherms, e.g. Freundlich or Langmuir isotherms. Specify what you really mean.
Dear Dr Aditya Amrut Pawar . See the following useful RG link: Article From Langmuir Isotherm to Brunauer‐Emmett‐Teller Isotherm
@Miroslaw Grezsik Sir I wanted to know the procedure to perform the Langmuir and freundlich isotherm by using the UV spectrophotometer.
- Badges
- Science method
- Similar topics
- Methodology
- Crystallography
- X-ray Diffraction