Fabrication and Investigation of New TiO2/Amino Acids Modified Chitosan For Methylene Blue Removal Via Adsorption and Photodegradation

Abstract

Modification of chitosan using amino acids (AA) obtained from the protein hydrolysis process of tofu wastewater (TW) and TiO2 had been successfully prepared and applied in methylene blue (MB) removal from aqueous solutions. Based on the XRD results, the addition of AA and TiO2 slightly changed the crystallinity properties of chitosan. FT-IR results confirmed the formation of Chitosan-amino acid/TiO2 films (CATF). The results of TGA and DSC showed that the addition of AA decreased the thermal stability of the film, but the addition of TiO2 was able to increase the thermal stability of the film. The addition of AA and TiO2 to chitosan improved the mechanical characteristics of chitosan, according to the tensile strength data. Based on the adsorption kinetics, the removal of MB followed a pseudo second order model (PSO). The isotherm model in the adsorption process follows the Langmuir isotherm model and the maximum adsorption capacity is 64.95 mg/g. Based on the regeneration test, the CATF could be regenerated.

Characterization Study of Dyes Photodegradation-Adsorption Products by TiO2-Chitosan Immobilized on Glass Beads using Flow System

“…The kinetics test determines the reaction order, while the reaction isotherm test shows the interaction between adsorbate molecules and the adsorbent surface by comparing R 2 values (Fathana et al, 2022). Thermodynamic tests are used to predict the spontaneity and nature of adsorbent interactions with dyes at equilibrium conditions using the influence of temperature.…”