Performance of Iron (III) in two different approaches through heterogeneous photo-Fenton-like degradation of Congo red
摘要
The aim of this work was focusing on comparison study through photo-Fenton-like catalysts. The effect of Iron III was investigated in two different cases by using layered double hydroxide of MgAl and MgAlFe in which were synthesized by co-precipitation method. In this sense, adsorption and photocatalytic degradation were examined to measure the performance of each catalysts for Congo red removal. The physic-chemical properties of MgAl and MgAlFe were characterized by X-ray diffraction (XRD) scanning electron microscope (SEM), Brunaur-Emmet-Teller (BET), Fourier transformed infrared (FTIR) spectra, thermogravimetric analysis TGA, and point of zero charge (PZC). Our results demonstrate higher adsorption and degradation at naturel pH by MgAlFe compared to the MgAl. Meanwhile, the time dependence of Congo red was well fitted by pseudo-second-order model with R2 > 0.999. The most accurate isotherm was Freundlich with R2 > 0.999. The operated parameters confirm that the best degradation was at acidic pH, and at natural pH respectively for MgAl and MgAlFe. In conclusion, the results obtained suggest that the heterogeneous photo-Fenton-like has excellent properties and the ability to remove Congo red in both cases adsorption and photocatalytic degradation.