Evaluation of the acute toxicity on Daphnia magna throughout the catalytic wet peroxide oxidation of dissolved natural organic matter

2020 ◽  
Vol 198 ◽  
pp. 272-283
Author(s):  
Camilo L. Guerrero-Romero ◽  
Dolly Revelo ◽  
Alejandra Caicedo ◽  
Marcela Botina ◽  
Ana M. García-Mora ◽  
...  
Keyword(s):  
Organic Matter ◽  
Acute Toxicity ◽  
Daphnia Magna ◽  
Natural Organic Matter ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation

scholarly journals Tungsten carbide nanoparticles in simulated surface water with natural organic matter: dissolution, agglomeration, sedimentation and interaction with Daphnia magna

2017 ◽  
Vol 4 (4) ◽  
pp. 886-894 ◽  
Author(s):  
Jonas Hedberg ◽  
Mikael T. Ekvall ◽  
Lars-Anders Hansson ◽  
Tommy Cedervall ◽  
Inger Odnevall Wallinder
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Acute Toxicity ◽  
Tungsten Carbide ◽  
Daphnia Magna ◽  
Natural Organic Matter ◽  
Simulated Surface

Nano-sized tungsten carbide shows no acute toxicity for Daphnia magna and agglomeration and sedimentation due to the lack of interaction with NOM.

scholarly journals Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 637
Author(s):  
Cristian S. Portilla-Delgado ◽  
Ana M. García-Mora ◽  
Frederic Dappozze ◽  
Chantal Guillard ◽  
Luis A. Galeano
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Visible Light ◽  
Natural Organic Matter ◽  
Visible Light Irradiation ◽  
Pillared Clay ◽  
Color Removal ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Clay Catalyst

An Al/Fe-pillared clay catalyst (Al/Fe-PILC) prepared from low cost technical-grade reagents has been investigated in the photocatalytic Wet Peroxide Oxidation (photo-CWPO) of dissolved Natural Organic Matter (NOM) under circumneutral pH. The successful pillaring of the layered clay material was confirmed by X-ray diffraction (XRD), N2 adsorption at −196 °C, cation exchange capacity (CEC) and simultaneous thermal analysis (TGA/DSC). High levels of mineralization of the dissolved organic carbon and color removal of a synthetic NOM surrogate solution were achieved even under natural lab’s lighting and ambient temperature and pressure, whereas the absence of radiation (in dark) was found to strongly affect the performance of the degradation. The photo-CWPO of NOM activated by the Al/Fe-PILC clay catalyst under visible light irradiation (LED lamp, 450 and 550 nm peaks) displayed a DOC mineralization of 72% and color removal of 73% in just 210 min of irradiation at neutral pH, whereas both responses decayed under ultraviolet lightning (λ: 365 nm) to 41% and 58%, respectively. This behavior is ascribed to formation of triplet states of natural organic matter (3NOM*) by absorption of visible light, which seems to synergistically improve the rate-determining step of the heterogeneous Fenton process, namely reduction of Fe3+ into Fe2+ on the surface of the clay catalyst. Interestingly, experiments performed at neutral and pH 3.0 showed very similar efficiencies under visible light irradiation; these findings may really facilitate the application of the photo-CWPO process to assist conventional drinking water treatment plants in the removal of NOM before the typical disinfection by chlorine to produce safer drinking water.

scholarly journals Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40450-40460
Author(s):  
Carlos Andrés Vallejo ◽  
Luis Alejandro Galeano ◽  
Raquel Trujillano ◽  
Miguel Ángel Vicente ◽  
Antonio Gil
Keyword(s):  
Solvent Free ◽  
Peroxide Oxidation ◽  
Highly Active ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation ◽  
Hydrolysis Of ◽  
Clay Catalysts

Significantly intensified preparation of Al/Fe-hydrolysed-pillaring solutions and solvent-free intercalation of bentonites yielding Al/Fe-PILCs highly active in catalytic wet peroxide oxidation.

Surface modification of sewage sludge derived carbonaceous catalyst for m-cresol catalytic wet peroxide oxidation and degradation mechanism

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41867-41876 ◽  
Author(s):  
Yang Yu ◽  
Huangzhao Wei ◽  
Li Yu ◽  
Tong Zhang ◽  
Sen Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Sewage Sludge ◽  
Organic Synthesis ◽  
Degradation Mechanism ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Carbonaceous Catalyst ◽  
Catalytic Wet Peroxide Oxidation

Organic synthesis is used to investigate the degradation of m-cresol and the intermediates are identified by in situ NMR.

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