Removal of EDDS and copper from waters by TiO2 photocatalysis under simulated UV–solar conditions

Enhanced anaerobic digestion of food waste by trace metal elements supplementation and reduced metals dosage by green chelating agent [S, S]-EDDS via improving metals bioavailability

“…Especially, when metal elements were chelated with EDTA before metals addition, the optimal dosage of metals could be reduced by 75% compared to the form of metal chlorides (Vintiloiu et al, 2013). Even though EDTA is one of the most popular chelating agents used in oxidative bleaching, detergents and cleaning compositions, scale prevention and reduction, remediation of soils, agriculture, electroplating, waste treatment, and biocides , it should be noted that EDTA is not biodegradable and is recalcitrant in the environment, which may induce the leaching of metal-complexes over a long time period and aggravate heavy metals pollution (Satyro et al, 2014). Thus, EDTA is gradually replaced by some biodegradable chelating agents, one of which is nitrilotriacetic acid (NTA) .…”

Simultaneous Removal of Cu, Fe, Zn and Edds From a Soil Washing Stream Through Photocatalytic Processes

“…The high efficiency of EDDS abatement in the O 2 presence is ascribed to the generation of hydroxyl radicals, which are powerful oxidizing species, capable to rapidly destroy a very large number of organic molecules. On the contrary, adopting TiO 2 /hν/N 2 system, EDDS is mainly removed, as previously reported (Satyro et al, 2014) through the reaction with the photogenerated holes, but this process is the only one capable of removing Cu(II) species, where it is reduced through the reaction with the photoelectrons (Fig. 2b).…”

“…That is the case of Fe(III)-EDDS that, under irradiation, works like a "homogeneous photo-Fenton systems" but at neutral pH's, enhancing the oxidative degradation of the organic ligands and promoting the precipitation of some metal ions present in the solution as metal hydroxide or as metal zero-valent state (Huang et al, 2013). In some cases, an alternative route may be pursued using heterogeneous TiO 2 -photocatalysis, since it has been proved that, at low pH, Cu(II) ions chelated with EDDS are photoreduced to zero-valent copper which is efficiently removed from the solution (Satyro et al, 2014).…”

An Experimental Study on the Simultaneous Phenol and Chromium Removal From Water Using Titanium Dioxide Photocatalyst

“…100% EDDs and Cu (II) conversions were observed however, mineralization was less than 24%. Data analysis showed that molar consumption of Cu (II) to EDDs is near to 2 [18]. Chromium (VI) removal from water by Au/Cu-TiO2 nanoparticles was conducted by Gondal et al the nanoparticles were synthesized by Sol-gel method and resulted in 96% photocatalytic reduction of chromium (VI) without addition of any additives [19].…”