degradation of Direct Blue ۷۱ from contaminated water by TiO۲ nanoparticles: Response surface methodology approach (RSM)

Background and Objective: In the current survey, the removal of dye from contaminated water was studied by photocatalytic degradation using TiO۲ nanoparticles with respect to pH, TiO۲ dosage, reaction time, temperature and initial dye concentration.Materials and method: TiO۲ nanoparticles were investigated by XRD, FESEM and FT-IR. The RSM was chosen to study the composition effects of input independent factors and one dependent output response (removal efficiency).Results: The P-value (۲.۲ × ۱۰ −۱۶), F-value (۱۸۳۲), R۲ (multiple R-squared: ۰.۹۹۸۵, adjusted R-squared: ۰.۹۹۷۲), and lack of fit (۰.۴۳۲) indicate that the reduced full second order model is highly significant for dye removal by TiO۲ nanoparticles. The maximum percentage removal of dye, ۹۰.۲%, was achieved at optimum operating conditions including pH=۶.۵, TiO۲ dose (۱.۲ g L -۱ ), contact time (۶۷.۵ min), temperature ( ۴۰ °C ), and dye concentrations (۵۵ mg L -۱ )), respectively. The maximum removal efficiency was calculated to be ۱۰۰%, using regression coefficients derived from the model and the Solver “Add-ins”.Conclusion: The results indicated that the TiO۲ photocatalyst was very proper for the removal dye from contaminated water, and it had good efficiency in eliminating textile dyes. This article is published in IRANIAN JOURNAL OF CATALYSIS.

کلیدواژه ها:

TiO۲ ، Photocatalyst ، Degradation ، Direct blue ۷۱ ، Optimization ، RSM