Preparation and application of α-Fe2O3@TiO2@SO3H for photocatalytic degradation and COD reduction of woodchips industry wastewater

Spectral Analysis of the Degradation of the Reactive Black 5 Dye Using Newly Developed Advanced Oxidation Process

“…The spectral analysis showed a hypochromic shift (Fig. 1,4,7,10,12), showing the reducing ability of the dye to absorb photons, revealing that the dye is degraded, establishing the effectiveness of AOP where dye decoloration related to electron transfer (e) from Mn, nascent oxygen and urea hydrogen peroxide complex, which makes AOP ultra-advanced with no dye peak even in minor quantity [22]. Therefore, the initial rapid part of oxidation may be attributed to a fast formation of an intermediate complex between the reactants and the dissociation of the complex leads to dye decolorization (Fig.…”

“…The rate of oxidation of RB5 by KMnO 4 in a neutral medium was accelerated via H 2 O 2 in the presence of urea used as a dye additive for fixation of the dye on fabrics. The H 2 O 2 is also an oxidizing agent which chemically digests complex organic compounds into smaller, less toxic and more biodegradable fragments, employed for organic oxidation of various water-soluble polymers, carbohydrates, and nitrogen compounds; destroys phenols and chelants; hydrolyzes formaldehyde, carbon disulphide, organophosphorus and BTEX pesticides, solvents, plasticizers, and almost any other organic needful management [20][21][22][23][24][25]. Furthermore, H 2 O 2 affects the COD of running streams and oxidizes both organic and inorganic contaminants, which promotes BOD.…”

“…Most AOP consists of the generation of highly reactive OH radicals, which are powerful oxidizing species that have the ability to mineralize organic pollutants or convert them into less harmful sludge [9][10][11][12][13][14][15]. Several AOP methods are available, generating *OH radicals, including both non-photochemical and photochemical methods like Ozonation, Ozonation at elevated pH (> 8.5) Ozone + hydrogen peroxide (O 3 /H 2 O 2 ), Ozone + catalyst (O 3 /CAT), Fenton system (H 2 O 2 /Fe 2 + ), O 3 /UV, H 2 O 2 /UV, O 3 /H 2 O 2 /UV, Photo-Fenton/Fenton-like systems [15][16][17][18][19][20][21][22]. Among these, the Fenton reaction (H 2 O 2 /Fe 2 + ) is promising and has been primarily studied alone, as well as with UV systems that showed higher capability towards the mineralization of organic pollutants [10].…”

Layered double hydroxides and their composites as high-performance photocatalysts for CO2 reduction

“…), and so on. 49,[53][54][55][56][57][58] Among the various semiconductors, layered double hydroxides (LDHs) have gained extensive attention, owning to their specific lamellar structure, compositionally tunable structures, and optical properties. [59][60][61][62][63][64][65][66][67] These features endow LDH materials with better CO 2 adsorption capacity and optional active sites.…”