Fixed-bed catalytic wet peroxide oxidation of phenol with titania and Au/titania catalysts in dark

Ferentz, Michael; Landau, Miron V.; Vidruk, Roxana; Herskowitz, M.

doi:10.1016/j.cattod.2014.05.013

Cited by 30 publications

(27 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results obtained for stability runs were in line with what was reported by other authors, who did not observe leaching of gold in their studies, nor a loss in catalytic activity …”

Section: Resultssupporting

confidence: 92%

“…The results obtained for stability runs were in line with what was reported by other authors, who did not observe leaching of gold in their studies, nor a loss in catalytic activity. 9,11,16,21,42,43 Parametric study Since the Au/Al 2 O 3 catalyst showed the highest TOF values and better process performance, this catalyst was chosen for a further study dealing with optimization of the process. For that, a wileyonlinelibrary.com/jctb parametric study was carried out for a better understanding of the effect of each operating variable on dye degradation and mineralization.…”

Section: Catalysts Stabilitymentioning

confidence: 99%

“…These drawbacks can be overcome by the use of noble metals (such as gold) as catalysts, since almost no leaching occurs under various reaction conditions, highlighting their stability and reusability. [9][10][11] As widely reported in the literature, gold is only active in the form of nanoparticles, well dispersed on the support. [12][13][14][15] Recently, studies using PWPO with gold-based catalysts were reported, namely Au/diamonds for the degradation of phenol, [16][17][18] Au-mpTiO 2 for decontamination of the chemical warfare agent Soman 19 and Au/CeO 2 for degradation of orange 7 dye.…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Dye‐containing wastewater treatment by photo‐assisted wet peroxidation using Au nanosized catalysts

Rodrigues

Silva

Carabineiro

et al. 2018

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Background The aim of this study is to test different supports on which to deposit Au nanoparticles and to determine the most suitable for Orange II (OII) dye degradation by a photo‐assisted wet peroxidation (PWPO) process. The catalysts used (Au‐Fe2O3, Au‐TiO2, Au‐ZnO and Au‐Al2O3) were prepared by the deposition–precipitation method; a reference catalyst from the World Gold Council, hereafter denoted as Au‐Fe2O3*, was also used for comparison. The catalysts were characterized in terms of surface area (SBET), gold nanoparticles size, Au loading and Au oxidation state using several techniques (namely, nitrogen adsorption at −196°C, X‐ray photoelectron spectroscopy – XPS, and high resolution transmission electron microscopy – HR‐TEM). Several runs were carried out for each material, to evaluate its efficiency in OII dye degradation by the PWPO process. Results All catalysts reached OII dye removals of >96% and considerable total organic carbon (TOC) degradation – between 58.4% and 80.5%. The materials had negligible Au leaching, showing very good stability. For the catalyst with best performance (Au/Al2O3), a parametric study was carried out to assess the effect of different variables on dye and TOC removals. Under the best conditions, excellent efficiency of the advanced oxidation process was obtained. A simulated industrial acrylic dyeing effluent was also treated by PWPO and very good performance was reached, with removals up to 100%, 72.4% and 70.0% for color, TOC and COD, respectively, with only 2 h of reaction. Moreover, there was an improvement in biodegradability and a non‐toxic effluent was generated. Conclusions PWPO using nano‐sized gold‐based catalysts proved to be a promising technique for the degradation of pollutants in water. The used gold supports have an important role in the efficiency of the process. The best catalyst was obtained using large surface area Al2O3 as support, although no leaching of gold was found for any of the catalysts. The mineralization degree improved under radiation due the formation of hydroxyl radicals, being reached total dye removal and a decrease of the TOC values greater than 90%. © 2018 Society of Chemical Industry

show abstract

“…The results obtained for stability runs were in line with what was reported by other authors, who did not observe leaching of gold in their studies, nor a loss in catalytic activity …”

Section: Resultssupporting

confidence: 92%

Section: Catalysts Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Dye‐containing wastewater treatment by photo‐assisted wet peroxidation using Au nanosized catalysts

Rodrigues

Silva

Carabineiro

et al. 2018

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…In order to overcome the problem of the catalysts lack of stability, some authors report on effluents treated by CWPO using gold catalysts supported on porous matrices. Although this might seem less economically attractive, given the price of gold, these catalysts present high stability, with negligible metal leaching, and are efficient in hydrogen peroxide consumption and pollutants degradation [66][67][68][69][70][71][72][73][74][75]. In the next sections, we will discuss some methods of preparation of nano gold-based catalysts and the treatment of effluents by CWPO catalyzed by gold.…”

Section: Catalytic Wet Peroxidationmentioning

confidence: 99%

“…In these studies, all oxidant was consumed and the gold did not leach into solution during the oxidation for the initial pH range tested. In the work developed by Ferentz et al [71], it was evaluated the degradation of phenol by CWPO using gold supported on titanium oxide . The TOC conversion increased with the pH of the In the work developed by Ferentz et al [71], it was evaluated the degradation of phenol by CWPO using gold supported on titanium oxide.…”

mentioning

confidence: 99%

Wastewater Treatment by Catalytic Wet Peroxidation Using Nano Gold-Based Catalysts: A Review

et al. 2019

View full text Add to dashboard Cite

Nowadays, there is an increasing interest in the development of promising, efficient, and environmentally friendly wastewater treatment technologies. Among them are the advanced oxidation processes (AOPs), in particular, catalytic wet peroxidation (CWPO), assisted or not by radiation. One of the challenges for the industrial application of this process is the development of stable and efficient catalysts, without leaching of the metal to the aqueous phase during the treatment. Gold catalysts, in particular, have attracted much attention from researchers because they show these characteristics. Recently, numerous studies have been reported in the literature regarding the preparation of gold catalysts supported on various supports and testing their catalytic performance in the treatment of real wastewaters or model pollutants by CWPO. This review summarizes this research; the properties of such catalysts and their expected effects on the overall efficiency of the CWPO process, together with a description of the effect of operational variables (such as pH, temperature, oxidant concentration, catalyst, and gold content). In addition, an overview is given of the main technical issues of this process aiming at its industrial application, namely the possibility of using the catalyst in continuous flow reactors. Such considerations will provide useful information for a faster and more effective analysis and optimization of the CWPO process.

show abstract

Relationship of Crystals Shape, Aggregation Mode and Surface Purity in Catalytic Wet Peroxide Oxidation of Phenol in Dark with Titania Anatase Nanocrystals

2018

View full text Add to dashboard Cite

Fixed-bed catalytic wet peroxide oxidation of phenol with titania and Au/titania catalysts in dark

Cited by 30 publications

References 33 publications

Dye‐containing wastewater treatment by photo‐assisted wet peroxidation using Au nanosized catalysts

Dye‐containing wastewater treatment by photo‐assisted wet peroxidation using Au nanosized catalysts

Wastewater Treatment by Catalytic Wet Peroxidation Using Nano Gold-Based Catalysts: A Review

Relationship of Crystals Shape, Aggregation Mode and Surface Purity in Catalytic Wet Peroxide Oxidation of Phenol in Dark with Titania Anatase Nanocrystals

Contact Info

Product

Resources

About