Abstract
Immobilized chitosan adsorbent on glass plates (CS/glass) has been fabricated as a pre-step towards the design of bilayer immobilized TiO 2–chitosan synergistic photocatalyst-adsorbent system. The characterizations of the immobilized chitosan were studied by SEM, FTIR, BET, and strength test. Experiments were carried out as a function of adsorbent loading, pH, contact time, initial dye concentration and temperature using Reactive Red 4 anionic dye (RR4) as a model pollutant. The adsorption equilibrium data can be described well by the Langmuir and Freundlich isotherm models. The maximum adsorption capacity calculated from the Langmuir model was found to be 172.41 mg g −1. Experimental kinetic data were analyzed using pseudo-first and pseudo-second order rate models. Pseudo-second order model demonstrated to be the best kinetic model for the system suggesting that the rate-limiting step may be chemisorption. The negative value of free energy and enthalpy obtained indicates that the adsorption process is spontaneous and exothermic.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
