Heterogeneous Fenton Catalyst for the Efficient Removal of Azo Dyes in Water

Abstract

Heterogeneous Fenton/photo Fenton type processes using a Fe-exchanged zeolite of Y-type have been applied for the degradation of a model textile synthetic water based on Black B azodye. Research work has been directed to compare process efficiency and to establish their advantages over corresponding homogenous Fenton type processes. By optimizing the amount of reactants and process conditions, a complete decolorization of the effluent and a reduction greater than 80 per cent in the total organic carbon content is achieved. The influence of solar radiation on the heterogeneous process has been also studied. Homogeneous and heterogeneous Fenton processes yielded similar decolorization and mineralization, but the concentration of Fe ions in the bulk after the treatment was not significant in the latter case. Moreover, the catalyst support can be reused in successive cycles without significant loss of effectiveness. The use of solar radiation as a source of energy for operating the process accelerates the decomposition of azodye, making the process economical and environmentally sustainable.

Kinetic modeling of a heterogeneous Fenton-type oxidative treatment of complex industrial effluent

“…9 and Table 3), it was confirmed that the reaction rate of heterogeneous oxidations was lower than that observed for the homogeneous ones, whereas the activation energy was higher, with the concomitant lower TOC conversion values. The results agree with those obtained by other authors [26], [54][55][56] and may be due to the reduced accessibility of H 2 O 2 to copper, as the active phase is supported on γ-Al 2 O 3 .…”

Requirements for effective photocatalytic oxidative desulfurization of a thiophene-containing solution using TiO2

“…The results in this study, therefore, suggest that methanol is a preferred solvent over water if the PODS reaction is to be carried out in a batch mode without flowing air. A trial was also conducted with a heterogeneous photo-Fenton catalyst (Fe 3+ ) supported on zeolite-Y (Fe/zeolite Y) which has been shown as an effective photo-catalyst for oxidation of organics at high concentration through rapid generation of hydroxyl radicals [20]. Fig.…”

Evaluation of Zeolite as a Potential Reactive Medium in a Permeable Reactive Barrier (PRB): Batch and Column Studies

“…Adsorption mechanisms require a suitable adsorbent material with a high removal capacity [14]. Normally, the materials chosen for such applications are those with a high degree of porosity, high cationic exchange capacity (CEC), specific surface area, environmental capability, availability and cost-effectiveness [15,16]. Additionally, to be economically advantageous, the material must have low economic value.…”

“…Clinoptilolite is one of the predominant natural species of zeolites and has been successfully used for contaminant removal [15,44]. This mineral belongs to the heulandite group and comprises a two-dimensional channel system (a 10-ring system (0.31 nm × 0.75 nm), an 8-ring system (0.36 nm × 0.46 nm) and channels (0.28 nm × 0.47 nm) [45].…”