Usually, conducting isotherm experiments in increasing concentration of PPCPs results in increasing adsorption of the adsorbent. But why mine is opposite? Does this mean I failed and have to synthesize new nanoparticle again?
I don't know much about impact of PPCP but there are certain possibilites that I can think of. Maybe you assessed the situation in terms of specific adsorptive power of your produced material. However, surface area or apparent surface area of your specimen might be reduced as well. Such as your production procedure or an impurity in your material may cause an increase in average diameter of your nanoparticles. It will reduce surface area per mass. This can be checked by electron microscope investigation. Also, the nanoparticles might be produced in anticipated or desired dimensions but they may stick one another so tight that apparent or effective surface area becomes lower than expected.
There are multiple reasons for the pattern of decreasing nanoparticles as concentration rises:
Aggregation: Because of stronger van der Waals interactions, nanoparticles may group together at higher concentrations, resulting in bigger particles and a smaller effective surface area.
Reactivity: Because of saturation effects or competitive interactions, increased concentrations in particular systems may result in decreased nanoparticle reactivity or efficiency.
Cloaking: Because they are shrouded or protected by other particles, nanoparticles may become less effective at interacting with their surroundings as concentration rises.
Sedimentation: When nanoparticles settle out of solution due to high concentrations, their availability for interactions or reactions is diminished.
Effects of Screening: Higher concentrations have the potential to reduce the effective activity of charged nanoparticles by screening interactions.
Kinetics: At increasing concentrations, the kinetics of reactions involving nanoparticles may alter, resulting in slower speeds or the suppression of desired processes.
Thank you Wondimagegne Mamo Mengistu sir!
My Isotherm experiment shows that with increasing Ce (concentration), the qe increased a bit and then decreased. I do not know how to explain this. It might be due to agglomeration?
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