Preparation of delafossite–type CuFeO2 powders by conventional and microwave–assisted hydrothermal routes for use as photo–Fenton catalysts

Novel application of FeIn2S4 as an efficient photo-Fenton catalyst for degradation of Ponceau 4R in aqueous solution

“…At pH 3, Fe 2+ species can easily decompose H 2 O 2 on the catalyst surface and lead to a greater generation of • OH radicals, improving the contaminant degradation (Grassi et al 2020). This result corroborates the optimum pH for heterogeneous photo-Fenton oxidation reported by others (Rajput et al 2016;Schmachtenberg et al 2019).…”

“…The average crystallite size was measured by the Scherrer's equation (Eq. 1) (Schmachtenberg et al 2019).…”

“…The treatment of organic contaminants can be accelerated using UV-Vis irradiation in the system (featuring the photo-Fenton process), due to the ability of light to promote the additional generation of • OH radicals (Pouran et al 2015;Palas et al 2016;Saleh;Taufik, 2019;Drumm et al 2019;Schmachtenberg et al 2019). The reactive oxygen species attack the dye molecule and break the azo bond (N=N), removing the wastewater color and degrading the compound into smaller molecules (Sahoo et al 2014).…”

Doping‐Dependent Phase Fractions in Hydrothermally Synthesized Mn‐Doped CuFeO2

“…Interestingly, the addition of an appropriate carbon source/carbon-based reactant might suppress 2H formation. [28,29] The indirect optical bandgap E g,ind of the CuFeO 2 samples was determined using the approach proposed by Tauc et al [30] and the quantity FðR ∞ Þ (see Section 4) as a representative for the optical absorption coefficient. For pure CuFeO 2 and CuFe 0.8 Mn 0.2 O 2 , the corresponding Tauc plots including the linear fits for determining E g,ind are shown in Figure 3.…”

“…In all cases, hexagonal platelets are formed with sizes ranging from about 500 to 800 nm, which is frequently observed for hydrothermally produced delafossite. [19,25,28] The Mn content was determined using EDX and is shown in Table 1. Thus, the actual Mn stoichiometry is about half of the nominal one resulting in an actual doping limit of 5%, which is obtained between 10% and 20% nominal doping (in line with the constancy of unit cell volume, see Figure 2).…”