Photo-assisted fenton mineralization of an azo-dye acid black 1 using a modified laponite clay-based Fe nanocomposite as a heterogeneous catalyst

摘要

Photo-assisted Fenton mineralization of an azo-dye Acid Black 1(AB1) was studied in detail using a modified laponite clay-based Fe nanocomposite(Fe-Lap-RD) as a heterogeneous catalyst in the presence of H_2O_2 and UV light.The Fe-Lap-RD was characterized by X-ray diffraction(XRD),X-ray fluorescence spectroscopy(XRF),X-ray photoelectron spectroscopy(XPS),and N_2 adsorption.The effects of reaction parameters such as initial AB1 concentration,H_2O_2 concentration,Fe-Lap-RD catalyst loading,initial solution pH,UV light wavelength and power,and reaction temperature on the mineralization of AB1 were investigated.Under the optimal reaction conditions(6.4 mM H_2O_2,1.0 g Fe-Lap-RD/L,8 W UVC,initial solution pH = 3.0),complete discoloration and over 90% total organic carbon(TOC) removal of 0.1 mM AB1 were achieved after 90 min reaction.Discoloration kinetics of AB1 was also studied to obtain apparent reaction rate constants and reaction activation energy.