Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method

Mnasri-Ghnimi, Saida; Frini-Srasra, N.

doi:10.1007/s11814-014-0204-2

Cited by 6 publications

(7 citation statements)

References 30 publications

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“…The acidity and basicity of a catalyst play an important role in the decomposition of H 2 O 2 and in the CWPO of pollutants, as observed in previous works related to the CWPO of phenol compounds with carbon-based catalysts [44]. In works related to the CWPO with clay-based catalysts, a correlation between the acidity of the catalysts and their performance in the oxidation process has also been observed [22][23][24]. However, the cited previous studies used a qualitative methodology, based on FTIR analysis of base compound-saturated clays, and acidity and basicity were not quantified.…”

Section: Acid-base Characterizationmentioning

confidence: 55%

“…Although this technology represent an interesting alternative, it has been scarcely studied so far for micropollutants abatement [18,20]. Clays play a prominent role as a catalyst in the field of organic pollutants removal by CWPO [21][22][23][24][25]. In this regard, natural clays can be chemically modified to increase their performance by different methods, such as activation or pillarization.…”

Section: Introductionmentioning

confidence: 99%

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Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays

et al. 2019

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Many pharmaceuticals have been recently identified at trace levels worldwide in the aquatic environment. Among them, the highly consumed paracetamol (PCM), an analgesic and antipyretic drug, is largely being accumulated in the aquatic environment due to inefficient removal by conventional sewage treatment plants. This work deals with the treatment of PCM, used as a model pharmaceutical contaminant of emerging concern, by catalytic wet peroxide oxidation using clay-based materials as catalysts. The catalysts were prepared from natural clays, extracted from four different deposits using acid-activated treatment, calcination, and pillarization with Fe and Co. Pillared clays show the highest catalytic activity owing to the presence of metals, allowing to remove completely the PCM after 6 h under the following operating conditions: CPCM = 100 mg L−1, CH2O2 = 472 mg L−1, Ccat = 2.5 g L−1, initial pH = 3.5 and T = 80 °C. The prepared materials presented high stability since leached iron was measured at the end of reaction and found to be lower than 0.1 mg L−1.

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Section: Acid-base Characterizationmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays

et al. 2019

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“…The ceria-based oxides take on potent oxygen storage property, and have dual roles of stabilizing the crystal structure and blocking the volume shrinkage. 20 The cerium oxide can be formed with the transition metal oxide to increase the dispersion and mechanical strength of active components on the catalyst surface at high temperature. Therefore, the loss of transition metal components can be inhibited, which makes catalyst more stable.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcination Temperature on Catalytic Performance of CeCu Oxide in Removal of Quinoline by Wet Hydrogen Peroxide Oxidation from Water

Jiao¹,

Zhou²,

Zhang³

et al. 2018

J. Braz. Chem. Soc.

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A facile citric acid-mediated complexation-calcination approach is reported in this paper to prepare the CeCu oxide composite with a porous structure that is highly efficient and durable for treating simulated quinoline wastewater by catalytic wet hydrogen peroxide oxidation (CWPO). As the results indicate, Cu species can be dissolved in CeO 2 lattice to fabricate a solid solution. The calcination temperature is critical for an optimum catalyst structure and catalytic performance. As found in investigating the structure and catalytic performance of the CeCu oxide prepared at calcination temperatures ranging from 350 to 750 °C, the optimum temperature is 650 °C, at which a loose surface, a porous structure and considerable adsorbed surface oxide/hydroxyl oxide species are fabricated over the catalyst. This resultant catalyst also takes on the optimal performance with an oxidation conversion reaching 98% for quinoline, a removal efficiency of 80.6% for total organic carbon (TOC) and a low Cu 2+ leaching value of 19.3 mg L -1. Besides, the high performance is maintained by the catalysts in a wide pH range of 5.1-10.5. This work generally provides an efficient way to design and fabricate the catalyst for CWPO reaction, which can also be applied in other reactions.

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“…phenols undergo mineralization. CWPO over heteregeneous catalysts has been previously studied using transition metals and their complexes such as Fe, Cu and Mn and other metals such as Si, Al and Ti based catalysts [16][17][18][19][20][21][22][23]. In these studies, metals have been typically used either in their pure oxide forms or their oxide forms on a micro/mesoporous support such as ZSM-5, Y5, SBA-15, pillared clay or activated carbon.…”

Section: Introductionmentioning

confidence: 99%

“…The aluminum-copper-iron, zirconium-cerium, manganese-copper on aluminum and ironaluminum containing PILC structures employed in the phenol oxidation exhibited good activity [16][17][18][31][32][33][34][35][36][37][38][39]. A limited number of studies involving titanium pillared structures have been reported in the literature [10,40].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cerium, Iron and Copper Incorporation on the Structural Properties and Activities of Ti-Pillared Bentonites

Başoğlu

2018

Cumhuriyet Science Journal

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Ti-pillared bentonite (Ti-PB) using bentonite from the Middle Anatolia region (Hançılı) was synthesized. Iron or copper was impregnated to Ti-PB from the solution and subsequent cerium incorporation was done by wet impregnation. The hydrothermal syntheses were carried out with a Cu/(Cu+Ti) ratios of 0.1 and 0.2. The anatase phase of titanium dioxide was found for all of the samples. The Ti-PB calcined at 500 °C gave a basal spacing value of 4.41 nm, a specific BET surface area of 348 m 2 g -1 , and a micropore volume of 0.093 cm 3 g -1 . While the post incorporation of copper and iron caused decrease in the micropore properties, the hydrothermally synthesized copper titanium samples reflected the similar behavior with Ti-PB. Energy dispersive X-ray spectroscopy (EDS) analyses indicated that TiO 2 content of all PBs was near 40 wt % and metal incorporation to Ti-PB was succesfully performed by the impregnation method. Ti-PB exhibited both the Lewis and Brønsted acidities. The copper impregnation resulted in an increase in the Lewis acidity. The hydrotermally synthesised copper containing sample and cerium-iron and cerium-copper impregnated samples yielded an increase in the Brønsted acidity. Approximately 90 % phenol conversion at 30 °C in an hour was achived with the cerium and iron containing sample and the completion of photocatalytic oxidation was reached at 2 hours. An increase of temperature rised the conversion of phenol, and the iron containing sample resulted in approximately 100 % conversion at an hour at 50 °C. Hydroquinone, benzoquinone and catechol and formic, malic, fumaric acids were observed as the reaction intermediates. The leaching of metals was observed at low values and the stability of iron was found six times higher than the copper.

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Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method

Cited by 6 publications

References 30 publications

Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays

Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays

Effect of Calcination Temperature on Catalytic Performance of CeCu Oxide in Removal of Quinoline by Wet Hydrogen Peroxide Oxidation from Water

Effects of Cerium, Iron and Copper Incorporation on the Structural Properties and Activities of Ti-Pillared Bentonites

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