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Modeling Urotropine adsorption thermodynamic on kaolinite particles
Qingling Zhu1, Zahraa Sabah Ghnim2, Subhash Chandra3
1Nanjing Forestry University, Nanjing, 210037, Jiangsu, China. zql1562137418@163.com.
Kaolinite efficiently adsorbs Urotropine, a key component in gel injections. This spontaneous, endothermic adsorption process is best described by the Langmuir model, though core flooding experiments showed reduced capacity due to porous media complexity.
Area of Science:
- Geochemistry
- Materials Science
- Physical Chemistry
Background:
- Urotropine is crucial for gel injections and clay stabilization.
- Understanding Urotropine adsorption on kaolinite is vital for process modeling.
Purpose of the Study:
- To investigate Urotropine adsorption by kaolinite particles.
- To determine the thermodynamics of the adsorption process.
Main Methods:
- X-ray diffraction (XRD) for kaolinite purity analysis.
- UV spectrophotometry to monitor Urotropine concentration.
- Langmuir adsorption isotherm modeling.
- Thermodynamic analysis at varying temperatures.
- Core flooding experiments.
Main Results:
- Kaolinite purity confirmed at 97% via XRD.
- Urotropine adsorption capacity reached 112 mg/g.
- Langmuir model accurately predicted adsorption behavior.
- Adsorption is endothermic (9534 J/mole) and spontaneous (negative Gibbs free energy).
- Core flooding showed lower adsorption capacity than batch experiments.
Conclusions:
- Kaolinite is an effective adsorbent for Urotropine.
- The adsorption process is spontaneous and endothermic.
- Porous media complexity in core flooding affects adsorption capacity.
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