Role of copper pyrovanadate as heterogeneous photo-Fenton like catalyst for the degradation of neutral red and azure-B: An eco-friendly approach

A review on Fenton-like processes for organic wastewater treatment

“…In addition to the iron-based catalyst, other kinds of transition metal catalyst like the Cu-based catalyst also attracts much attention in organic WW treatment. Kalal et al [92] and Lam et al [93] developed copper pyrovanadate and Copper/MCM-41, respectively, to treat organic WW. In the study by Kalal et al [92] researchers found that copper pyrovanadate had better catalytic capacity than that of CuO and V2O5; the shell of the copper pyrovanadate could be the main reason as the copper pyrovanadate can increase the surface hydroxyl groups and enhance the interfacial electron transfer.…”

“…Taking photo-Fe 3+ -H2O2 system as an example, except for the reactions in the Fe 3+ -H2O2 system, two extra reactions can occur due to the existence of photo irradiation. The first reaction involves Fe 3+ ions (which exist in the form of Fe(OH) 2+ under acidic condition) undergoing a photochemical reduction process to form Fe 2+ ions under UV-vis radiation (equation ( 5)) [92,94,95]; the second reaction involves H2O2 generating HO• via a photolysis process under shorter wavelength radiation (equation ( 6)) [94][95][96].…”

Copper-based non-precious metal heterogeneous catalysts for environmental remediation

“…Kalal et al [121] prepared a copper pyrovanadate photo Fenton catalyst using a wet chemical method and applied it to the degradation of neutral red and azure B. The authors found that the photo Fenton activity of copper pyrovanadate was much higher than those of CuO and V2O5.…”

Hydrothermal synthesis of PrVO 4 nanocubes with enhanced photocatalytic performance through a synergistic effect

“…Owing to the generation of large amounts of hydroxyl radicals, advanced oxidation processes have shown great potential for degrading various organic pollutants from wastewater in the last decade [13][14][15][16][17][18]. Similar to the photo-Fenton-like reaction of ferrous salt, it is believed that the vanadate compounds can be activated by a small amount of H 2 O 2 through the following three-step reaction [19,20]:…”

“…Owing to the generation of large amounts of hydroxyl radicals, advanced oxidation processes have shown great potential for degrading various organic pollutants from wastewater in the last decade [13–18]. Similar to the photo‐Fenton‐like reaction of ferrous salt, it is believed that the vanadate compounds can be activated by a small amount of H 2 O 2 through the following three‐step reaction [19, 20]: Owing to the application of homogeneous Fenton's reagent is limited by the narrow working pH and the need for separation and recovery of the iron species [15], the heterogeneous Fenton‐like reactions can eliminate pollutants efficiently relatively. Therefore, some other multivalent metal oxides, such as cobalt, manganese, cerium and copper oxides, have also been used as Fenton‐like catalysts for the activation of H 2 O 2 to overcome these drawbacks and extend the working pH range [17].…”