Catalytic ozonation of bisphenol A in aqueous solution using Mn-Ce/HZSM-5 as catalyst

2015 ◽  
Vol 72 (5) ◽  
pp. 696-703 ◽  
Author(s):  
Yanfang Liu ◽  
Junna Zhao ◽  
Zaixing Li ◽  
Guixia Li ◽  
Wei Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Bisphenol A ◽  
Heterogeneous Catalysts ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Point Of Zero Charge ◽  
Toc Removal ◽  
Tert Butyl Alcohol ◽  
Bpa Removal

Mixed manganese and cerium oxide supported on HZSM-5 were synthesized and used as heterogeneous catalysts for ozonation of bisphenol A (BPA) in aqueous solution. The prepared catalysts of Mn-Ce/HZSM-5 were characterized by X-ray diffraction, scanning electron microscopy and Fourier transform-infrared spectroscopy. The results indicated that Mn-Ce/HZSM-5 exhibits extraordinary catalytic activity for the degradation of BPA. Removal of 89.3% of BPA and 90.4% of total organic carbon (TOC) was achieved in 30 min, compared to non-catalytic ozonation, where only 50.5% BPA and 28.1% TOC removal were reached under the same conditions. Adsorption of BPA on HZSM-5 support and Mn-Ce/HZSM-5 catalysts was negligible. The strong inhibition of BPA removal by tert-butyl alcohol indicated that the attack of hydroxyl radicals was responsible for the improvement of catalytic ozonation. It was observed that at neutral pH, which is near the point of zero charge of the catalyst, the catalytic activity reached its maximum. Increasing the amount of Mn-Ce/HZSM-5 catalyst until it exceeded 3 g/L did not show a strong effect on BPA removal. The catalysts showed high stability and reusability.

Degradation of p-Chloronitrobenzene in Aqueous Solution by Iron Silicate Catalytic Ozonation

2014 ◽  
Vol 955-959 ◽  
pp. 2162-2168 ◽  
Author(s):  
Yue Liu ◽  
Lei Liu ◽  
Wei Jin Gong
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Radical Scavenger ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Hydroxyl Radical Scavenger ◽  
Radical Type ◽  
Ozonation Process

Iron silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of p-Chloronitrobenzene (pCNB). The catalytic ozonation removal effectiveness of pCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of pCNB, but the presence of iron silicate in ozonation process could substantially enhance the pCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that iron silicate catalytic ozonation followed a radical-type mechanism. The increasing of both the iron silicate dosage and the ozone dosage could enhance the removal effectiveness of pCNB. The iron silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the iron silicate was an efficient green catalyst for pCNB degradation in drinking water.

Friedel-Crafts Alkylation of Mesitylene with tert-Butyl Alcohol over Novel Solid Acid Catalyst UDCaT-5

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Ganapati D. Yadav ◽  
Shashikant B Kamble
Keyword(s):  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Reaction Pathway ◽  
Solid Acid Catalyst ◽  
Butyl Alcohol ◽  
High Catalytic Activity ◽  
Order Kinetic ◽  
Tert Butyl ◽  
Tert Butanol ◽  
Tert Butyl Alcohol

Alkylation of mesitylene with tert-butyl alcohol in the presence of novel mesoporous superacidic catalysts, namely, UDCaT-4, UDCaT-5 and UDCaT-6 was investigated. The catalysts are modified versions of zirconia showing high catalytic activity, stability and reusability in the presence of water as compared to conventional sulfated zirconia. The catalytic activity is in the order: UDCaT-5 (most active) > UDCaT-6 > UDCaT-4 > sulfated zirconia (S-ZrO2) (least active). The synergistic effect of the very high sulfur content present (9% w/w S) and the preservation of the tetragonal phase in UDCaT-5, in comparison with sulfated zirconia (4% w/w S), were responsible for higher catalytic activity. A catalyst ensuring the production of 2-tert-butyl-mesitylene (2-TBMT) with 98% selectivity and 94% conversion of tert-butanol (TBA) was developed under optimum reaction conditions. The formation of products is correlated with the acidity of the catalyst. The reactions were conducted in liquid phase at relatively low reaction temperatures (120–150 °C). A systematic investigation of the effects of various operating parameters was accomplished and a mathematical model is developed to describe the reaction pathway and validated with experimental results. The reaction was carried out without using any solvent in order to make the process cleaner and greener. An overall second order kinetic equation was used to fit the experimental data, under the assumption that both mesitylene and tert-butanol are weakly adsorbed. An independent dehydration study of tert-butanol (TBA) was also done.

scholarly journals Degradation of Bisphenol-A: A Contaminant of Emerging Concern Using Catalytic Ozonation By Activated Carbon Impregnated Nanocomposite-Bimetallic Catalyst

2021 ◽  
Author(s):  
Hariprasad Pokkiladathu ◽  
Salman Farissi ◽  
Anbazhagi Sakkarai ◽  
Muthukumar Muthuchamy
Keyword(s):  
Activated Carbon ◽  
Bisphenol A ◽  
Bimetallic Catalyst ◽  
Degradation Pathway ◽  
Catalytic Ozonation ◽  
Toc Removal ◽  
Treated Sample ◽  
Aromatic Degradation ◽  
Exponential Population Growth ◽  
Pollution Events

Abstract Rampant water pollution events and rising water demand caused by exponential population growth and depleting freshwater resources speak of an impending water crisis. The inability of conventional wastewater treatment systems to remove Contaminants of Emerging Concern (CEC) such as Bisphenol-A (BPA) beckons for new and efficient technologies to remove them from wastewater and water sources. Advanced oxidation processes such as ozonation are primarily known for their capability to oxidize and degrade organic entities in water but optimum mineralization levels were hard to achieve. In this study, we synthesized an activated carbon impregnated nanocomposite-bimetallic catalyst (AC/CeO2/ZnO) and used it along with ozonation to remove BPA from water. The catalyst was characterized using BET, XRD, FESEM, Raman spectra, and DLS studies. Catalytic ozonation achieved TOC removal 25% higher than non-catalytic ozonation process. The degradation pathway of BPA was proposed using LC-MS/LC-Q-TOF studies that found six main aromatic degradation byproducts. Catalytic ozonation and non-catalytic ozonation followed similar degradation pathways. The formation of persistent aliphatic acidic byproducts in the treated sample made TOC removal above 61% difficult.

Heterogeneous catalytic ozonation of 2, 4-dinitrophenol in aqueous solution by magnetic carbonaceous nanocomposite: catalytic activity and mechanism

2015 ◽  
Vol 57 (43) ◽  
pp. 20447-20456 ◽  
Author(s):  
Yousef Dadban Shahamat ◽  
Mahdi Sadeghi ◽  
Ali Shahryari ◽  
Niloofar Okhovat ◽  
Farshad Bahrami Asl ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Heterogeneous Catalytic

Synergistic Effect of Nitric Acid Modified and Cu(II)-Loaded Activated Carbon on Catalytic Ozonation

2014 ◽  
Vol 1073-1076 ◽  
pp. 708-711
Author(s):  
Jing Zhang ◽  
Ya Wei Du ◽  
Xiao Jing Liu ◽  
Yu Wen Zhou ◽  
Chun Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Synergistic Effect ◽  
Functional Groups ◽  
Catalytic Ozonation ◽  
Reusable Catalyst ◽  
Surface Functional Groups ◽  
Acid Modification ◽  
Toc Removal

The surface properties and performance of activated carbon (AC) used for catalytic ozonation were investigated after nitric acid modification (N-AC) and Cu (II)-loaded (N-Cu-AC). The results showed that the nitric acid modification could increase the amount of surface functional groups of AC. As a result, the adsorption capacity and catalytic activity of AC could be improved. The surface functional groups and Cu (II)-loaded of N-Cu-AC showed a synergistic effect on catalytic ozonation, where the catalytic activity of Cu (II)-loaded was more stable. N-Cu-AC was an effective and reusable catalyst for catalytic ozonation. The highest TOC removal efficiency of 58.0% could be achieved when N-Cu-AC was used for 60 min-catalytic ozonation treatment of acid red 3R.

scholarly journals An Overview of the Production of Oxygenated Fuel Additives by Glycerol Etherification, Either with Isobutene or tert-Butyl Alcohol, over Heterogeneous Catalysts

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2364 ◽  
Author(s):  
Estevez ◽  
Aguado-Deblas ◽  
Luna ◽  
Bautista
Keyword(s):  
Heterogeneous Catalysts ◽  
Value Added ◽  
Butyl Alcohol ◽  
Biodiesel Production ◽  
Tert Butyl ◽  
Fuel Blends ◽  
Tert Butyl Alcohol ◽  
Oxygenated Fuel ◽  
Research Findings

Biodiesel production has considerably increased in recent decades, generating a surplus of crude glycerol, which is the main drawback for the economy of the process. To overcome this, many scientists have directed their efforts to transform glycerol, which has great potential as a platform molecule, into value-added products. A promising option is the preparation of oxygenate additives for fuel, in particular those obtained by the etherification reaction of glycerol with alcohols or olefins, mainly using heterogeneous catalysis. This review collects up-to-date research findings in the etherification of glycerol, either with isobutene (IB) or tert-Butyl alcohol (TBA), highlighting the best catalytic performances reported. Furthermore, the experimental sets employed for these reactions have been included in the present manuscript. Likewise, the characteristics of the glycerol ethers–(bio)fuel blends as well as their performances (e.g., quality of emissions, technical advantages or disadvantages, etc.) have been also compiled and discussed.

scholarly journals Sustainable Carbon-Based Materials as Heterogeneous Catalysts in Solvent-Free Acetylation Reactions

Proceedings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 40 ◽  
Author(s):  
Ignacio M. López-Coca ◽  
Silvia Izquierdo ◽  
Guadalupe Silvero ◽  
Carlos J. Durán-Valle
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Photoelectron Spectroscopy ◽  
Heterogeneous Catalysts ◽  
Activated Carbons ◽  
Nitrogen Adsorption ◽  
Solvent Free ◽  
Point Of Zero Charge ◽  
Organic Analysis ◽  
Catalytic Material

The catalytic activity of six different carbons was tested in the solvent-free acetylation reaction of alcohols, phenols, and monosaccharides with acetic anhydride. Three commercial carbons—a basic activated carbon M (Merck KGaA), a moderately basic carbon gel X (Xerolutions S.L.), and an activated carbon N (Norit Netherland B.V.)—were studied. From these commercial carbons, three acidic activated carbons—M-S, X-S, and N-S—were obtained by treatment with sulfuric acid. All six carbons were characterized by means of nitrogen adsorption capacity, porosimetry, elemental organic analysis, X-ray photoelectron spectroscopy (XPS), and point of zero charge (PZC) determination. The experiments carried out showed good catalytic activity, the magnitude of which depended on the type of carbon used. The best catalyst was X-S, which combined high acidity with the largest mesoporous volume. Second in line was the commercial carbon M, which was the most basic. The protocol reported herein encompasses several of the characteristics related to the sustainability of chemical processes, such as the innocuous nature and the affordable cost of the catalytic material, the absence of reaction solvent, and the ease of reaction work-up.

scholarly journals Catalytic ozonation of diclofenac with iron silicate-loaded pumice in aqueous solution

2017 ◽  
Vol 17 (5) ◽  
pp. 1458-1467
Author(s):  
Guoying Gao ◽  
Wei Chu ◽  
Zhonglin Chen ◽  
Jimin Shen
Keyword(s):  
Aqueous Solution ◽  
Synergetic Effect ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Oh Radicals ◽  
Ozone Decomposition ◽  
Impregnation Method ◽  
Toc Removal ◽  
Co Precipitation ◽  
Adsorption Desorption

The catalytic ozonation of diclofenac (DCF) with iron silicate-loaded pumice (FSO/PMC) in aqueous solution was investigated. FSO/PMC was synthesized by a co-precipitation–impregnation method and characterized using scanning electron microscope, N2 adsorption–desorption, X-ray fluorescence, and pHpzc measurements. Results showed that the FSO/PMC/O3 process obviously improved total organic carbon (TOC) removal efficiency from 32.3% (using sole ozonation) to 73.3% in 60 min. DCF mineralization in various oxidation processes was found to follow a two-stage pseudo-first-order kinetics. The presence of FSO/PMC effectively improved the mass transfer of ozone from gas to liquid phase and increased the efficiency of ozone decomposition, which results in the formation of •OH radicals. The ozonation of DCF generated large amounts of the ozone-refractory carboxylic acids, and these compounds were found to be continuously removed in the FSO/PMC/O3 process due to the catalytic activity of FSO/PMC. The synergetic effect between ozonation and FSO/PMC adsorption indicated that FSO/PMC is a promising catalyst for the ozonation process.

scholarly journals Promoted ozonation for the decomposition of 1,4-dioxane by activated carbon

2016 ◽  
Vol 17 (2) ◽  
pp. 613-620 ◽  
Author(s):  
Gui-Peng Tian ◽  
Qian-Yuan Wu ◽  
Ang Li ◽  
Wen-Long Wang ◽  
Hong-Ying Hu
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Traditional Treatment ◽  
Treatment Processes ◽  
Tert Butyl Alcohol ◽  
Water And Wastewater ◽  
The Stability ◽  
The Ideal

Worldwide attention has been attracted to 1,4-dioxane because of its probable human carcinogenicity and frequent occurrence in surface waters and wastewaters. Thus, many countries and organizations have set limits for the amount of this material in drinking water and wastewater effluent. However, the removal of 1,4-dioxane during traditional treatment processes, even ozonation (pH < 7), has been limited. Therefore, 1,4-dioxane removal during catalytic ozonation was investigated in this study, and activated carbon was selected as the ideal catalyst. The removal efficiency of 1,4-dioxane by ozonation was promoted significantly using activated carbon compared with that of ozonation only. Tert-butyl alcohol significantly reduced the removal efficiency of 1,4-dioxane during catalytic ozonation, which suggested that hydroxyl radicals (·OH) were formed during catalytic ozonation and played an important role in decomposing 1,4-dioxane. Additionally, results concerning the stability of activated carbon indicated that the catalytic activity of this catalyst remained steady during ozonation.

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