Adsorption Capacity Calculator
Calculate the equilibrium adsorption capacity (qe) of a material using the Langmuir or Freundlich isotherm equations.
Isotherm Parameters
Result
Enter parameters and click Calculate.
Adsorption Capacity qe
—
mg/g
Formula Used
qe = (Qmax × KL × Ce) / (1 + KL × Ce)
RL = 1 / (1 + KL × C0)
qe = KF × Ce1/n
RL Interpretation (Langmuir)
| RL range | Isotherm type |
|---|---|
| RL = 0 | Irreversible |
| 0 < RL < 1 | Favorable |
| RL = 1 | Linear |
| RL > 1 | Unfavorable |
Summary
Calculate the equilibrium adsorption capacity (qe) of a material using the Langmuir or Freundlich isotherm equations.
How it works
- Select the isotherm model: Langmuir or Freundlich.
- Enter the equilibrium concentration (Ce) in mg/L.
- For Langmuir, provide the maximum adsorption capacity (Qmax) and the Langmuir constant (KL).
- For Freundlich, provide the Freundlich constant (KF) and the heterogeneity factor (1/n).
- Click Calculate to get qe (mg/g), the amount adsorbed per gram of adsorbent.
- Use the separation factor RL (Langmuir only) to assess isotherm favorability.
Use cases
- Evaluate adsorbent performance for heavy metal removal from wastewater.
- Compare Langmuir and Freundlich fits for experimental sorption data.
- Design activated carbon filters for water and air treatment systems.
- Estimate loading capacity of ion-exchange resins.
- Academic coursework in environmental and chemical engineering.
- Predict breakthrough capacity in packed-bed adsorption columns.
Frequently Asked Questions
Last updated: 2026-06-18 ·
Reviewed by Nham Vu