Combination of photocatalytic degradation and adsorption in dye removal by TiO₂-chitosan-glycerol beads under natural sunlight

Abstract

The synthesis of TiO2-chitosan-glycerol (TiCsG) beads was prepared to determine the optimum condition for dye removal under natural sunlight. By using the orthogonal array design with five parameters (ratio of TiO2/Chitosan, initial concentration of dyes, pH of solution, irradiation time, dose of TiCsG) to analyze their interaction such as well as optimizing the photocatalytic process. The significant parameters influent in the removal of Acid Blue 193, MO, NWY dyes were irradiation time (p = 0.011) and the ratio of TiO2/chitosan (p = 0.025), while the initial concentration of dyes, pH of dye solution and dose of TiCsG were unimportant factors with p > 0.05. The optimum of factors based on the ratio of signal per noise to attain the highest dye removal ability of TiCsG was the percentage of TiO2/chitosan = 2 % w/w (level 2), initial concentration of dye at level 5 (10 mg/L of AB 193, 5 mg/L for MO and 100 mg/L for NWY), pH =4.5 (level 2), irradiation time =1.5 h (level 5) and dose of TiCsG =0.2 g/mL (level 4).

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

“…Thus far, the use of TiO2-chitosan immobilized on the surface of glass beads for photodegradation-adsorption of dyes has only been carried out with a batch system without further identification of the degradation products (Aoudjit et al, 2021;Hoang et al, 2021;Tran et al, 2022). Batch photoreactors are more challenging to apply on a large scale than flow systems designed explicitly for photodegradation-adsorption processes, material usage, and low cost (Balarabe & Maity, 2022).…”