Two-regime kinetic study and parameter optimization of degradation of 3,4-dichloroaniline using TI-N/S catalyst under visible light

摘要

This paper presents the research of the effects of operating parameters on the photocatalytic degradation of 3,4-dichloroaniline (3,4-DCA) using non-metal doped TiO2-based photocatalysts. The nitrogen- and sulfur-doped in TiO2 which was prepared using sol-gel method. The prepared catalyst was characterized using XRD, SEM-EDX, FTIR, XPS, DRS, and BET analysis. The characterization revealed that Ti-N showed lower particle size, higher specific surface area, and low band-gap energy as compared to Ti-S. The photocatalytic degradation of 3,4-DCA using Ti-N showed better activity as compared to Ti-S and undoped TiO2. The findings revealed that various parameters, such as the initial pH of the solution to be degraded, catalyst loading, concentration of solution, and light intensity, exert their individual influence on the photocatalytic degradation of 3,4-DCA. The kinetics of degradation of 3,4-DCA followed two-regime LH model and rate constants were determined. The reaction constant and Langmuir adsorption constants were determined and half-life time which was determined was found to be closer to those determined using two-regime fit.