Please ask the specific question and share details about your problems, there are lot of experts who are working on water treatment & waster water treatment.
The answer can be made in a several ways according to your experiment conditions. First guess is a desorption phenamonon because of breakthrough of your adsorbent. Second guess is wrong measurement of the UV test. Third guess is not match between your pollutant and the absorbent and a UV wavelength can reponse more than one matter.
Dear Mustafa..... We have a team of researchers in water treatment by adsorption at the university of technology, UOT, Baghdad. You are welcome to present your questions. You may choose to come directly to UOT.
first one thank you for your interest in the question .
I have drawn all the curves, but I'm having a difficult for calculating the values of the Freundlich (Kf, n) and Langmuir (KL, qm) constants .thanks for all