Total mineralization of sulfamethoxazole and aromatic pollutants through Fe2+-montmorillonite catalyzed ozonation

Shahidi, Dariush; Moheb, Amira; Abbas, Rabah; Larouk, Safa; Roy, René; Azzouz, Abdelkrim

doi:10.1016/j.jhazmat.2015.05.029

Cited by 40 publications

(40 citation statements)

References 40 publications

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“…Furthermore, oxidation of amino group of the hydroxy-TBPs leads to the formation of the hydroxylated nitroso-derivative (TBP8). This TBP has been reported during ozonation [71] and catalytic ozonation [66] of SMX.…”

Section: Antimicrobial Activity and Oxidation Mechanism: A Water Treasupporting

confidence: 68%

“…The cleavage of sulfonamide bond has been widely observed in the oxidation of SMX by other AOP [65,67,[74][75][76][77]. Subsequent oxidation steps of the identified TBPs results in the opening of the benzoic and isoxazole rings and the progressive formation of lower molecular weight organic compounds such as aliphatic alcohols, aldehydes, and carboxylic acids [65,66], in accordance with the partial mineralization observed (ca. 42% TOC removal).…”

Section: Antimicrobial Activity and Oxidation Mechanism: A Water Treasupporting

confidence: 57%

“…Hydroxylation is a well-reported pathway during the degradation of SMX by various AOP. Similar hydroxy-TBPs have been previously described as by-products of TiO 2 photocatalysis, photo-Fenton, ultrasound/ozone oxidation, ferrous-activated persulfate oxidation, thermo activated persulfate oxidation, ozonation, catalytic ozonation and electrochemical oxidation, among others [65][66][67][68][69][70][71][72][73].…”

Section: Antimicrobial Activity and Oxidation Mechanism: A Water Treamentioning

confidence: 78%

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Magnetic carbon xerogels for the catalytic wet peroxide oxidation of sulfamethoxazole in environmentally relevant water matrices

Ribeiro

Frontistis

Mantzavinos

et al. 2016

Applied Catalysis B: Environmental

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a b s t r a c tNovel magnetic carbon xerogels consisting of interconnected carbon microspheres with iron and/or cobalt microparticles embedded in their structure were developed by a simple route. As inferred from the characterization data, materials with distinctive properties may be directly obtained upon inclusion of iron and/or cobalt precursors during the sol-gel polymerization of resorcinol and formaldehyde, followed by thermal annealing. The unique properties of these magnetic carbon xerogels were explored in the catalytic wet peroxide oxidation (CWPO) of an antimicrobial agent typically found throughout the urban water cycle -sulfamethoxazole (SMX).A clear synergistic effect arises from the inclusion of cobalt and iron in carbon xerogels (CX/CoFe), the resulting magnetic material revealing a better performance in the CWPO of SMX at the ppb level (500 g L −1 ) when compared to that of monometallic carbon xerogels containing only iron or cobalt. This effect was ascribed to the increased accessibility of highly active iron species promoted by the simultaneous incorporation of cobalt.The performance of the CWPO process in the presence of CX/CoFe was also evaluated in environmentally relevant water matrices, namely in drinking water and secondary treated wastewater, considered in addition to ultrapure water. It was found that the performance decreases when applied to more complex water and wastewater samples. Nevertheless, the ability of the CWPO technology for the elimination of SMX in secondary treated wastewater was unequivocally shown, with 96.8% of its initial content being removed after 6 h of reaction in the presence of CX/CoFe, at atmospheric pressure, room temperature (T = 25 • C), pH = 3, [H 2 O 2 ] 0 = 500 mg L −1 and catalyst load = 80 mg L −1 . A similar performance (97.8% SMX removal) is obtained in 30 min when the reaction temperature is slightly increased up to 60 • C in an ultrapure water matrix. Synthetic water containing humic acid, bicarbonate, sulphate or chloride, was also tested. The results suggest the scavenging effect of the different anions considered, as well as the negative impact of dissolved organic matter typically found in secondary treated wastewater, as simulated by the presence of humic acid.An in-situ magnetic separation procedure was applied for catalyst recovery and re-use during reusability cycles performed to mimic real-scale applications. CWPO runs performed with increased SMX 171 concentration (10 mg L −1 ), under a water treatment process intensification approach, allowed to evaluate the mineralization levels obtained, the antimicrobial activity of the treated water, and to propose a degradation mechanism for the CWPO of SMX.

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Section: Antimicrobial Activity and Oxidation Mechanism: A Water Treasupporting

confidence: 68%

Section: Antimicrobial Activity and Oxidation Mechanism: A Water Treasupporting

confidence: 57%

Section: Antimicrobial Activity and Oxidation Mechanism: A Water Treamentioning

confidence: 78%

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Magnetic carbon xerogels for the catalytic wet peroxide oxidation of sulfamethoxazole in environmentally relevant water matrices

Ribeiro

Frontistis

Mantzavinos

et al. 2016

Applied Catalysis B: Environmental

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“…12). MMT possesses large specific area and high structural charge (up to 1000 meq kg −1 ), which endow them with excellent adsorption properties [86][87][88]. MMT supported Sn catalyst Sn-MMT, prepared by ion-exchanging method in the presence of HCl, exhibited an efficient and very cost-effective catalyst for the BV oxidation reactions [89], showing the similar catalytic mechanism to that of the Sn-beta-zeolites [40].…”

Section: Sn-based Cationic Clay Catalystsmentioning

confidence: 99%

Sn-based catalysts for Baeyer-Villiger oxidations by using hydrogen peroxide as oxidant

Cui

Shi

2016

Sci. China Mater.

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Baeyer-Villiger (BV) oxidation is one of the most important transformation reactions in synthetic organic chemistry. Catalytic versions of the BV oxidation are particularly attractive in practical applications, because the catalytic transformation substantially simplifies reaction process while minimizing reactant consumption as well as waste production. Further benefits are expected from replacing peracids, the traditionally used oxidant, by low cost and environmentally friendly hydrogen peroxide (H2O2). This review will first introduce very briefly the features of BV oxidation reactions, and the corresponding oxidants traditionally used. Afterwards, the emphasis will be placed on the specific Sn-based catalysts, their performance comparison for the BV oxidation reaction by using H2O2 as oxidant, and the catalytic mechanisms of most Sn-based catalysts reported so far, including homogeneous Sn-based catalysts (such as Sn-based fluorous biphase system catalysts), heterogeneous Sn-based catalysts (such as Sn-based zeolite catalysts, Sn-based mesoporous composites, Sn-incorporated clay catalysts, Sn-based metal oxide composites and polymer supported Sn catalysts). Finally, the Sn-based catalysts for BV oxidation are outlooked for their potentials and perspectives in enhancing the performance and then accelerating the practical applications of BV oxidations by using H2O2. The developing direction of the Sn-based catalytic BV reaction is also illustrated.

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“…Physical-chemical technologies have been used to modify the chemical characteristics of wastewaters and render them treatable in biological systems without adverse effects. Advanced oxidation processes, such as Fenton reactions [6,7], ozonation [8,9], and photochemical oxidation [10,11] have shown great potential due to their high efficiency in removing refractory compounds. These technologies can mineralize contaminants completely and have been intensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Actual Chemical Wastewater by a Heterogeneous Fenton Process Using Natural Pyrite

Sun

2015

IJERPH

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Wastewater from chemical plants has remarkable antibiotic effects on the microorganisms in traditional biological treatment processes. An enhanced Fenton system catalyzed by natural pyrite was developed to degrade this kind of wastewater. Approximately 30% chemical oxygen demand (COD) was removed within 120 min when 50 mmol/L H2O2 and 10 g/L natural pyrite were used at initial pH from 1.8 to 7. A BOD5/COD enhancement efficiency of 210% and an acute biotoxicity removal efficiency of 84% were achieved. The COD removal efficiency was less sensitive to initial pH than was the classic Fenton process. Excessive amounts of pyrite and H2O2 did not negatively affect the pyrite Fenton system. The amount of aniline generated indicated that nitrobenzene reduction by pyrite was promoted using a low initial concentration of H2O2 (<5 mmol/L). Fluorescence excitation emission matrix analyses illustrated that H2O2 facilitated the reduction by natural pyrite of organic molecules containing an electron-withdrawing group to electron-donating group. Thus, the Fenton-like process catalyzed by pyrite can remediate wastewater containing organic pollutants under mild reaction conditions and provide an alternative environmentally friendly method by which to reuse natural pyrite.

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Total mineralization of sulfamethoxazole and aromatic pollutants through Fe2+-montmorillonite catalyzed ozonation

Cited by 40 publications

References 40 publications

Magnetic carbon xerogels for the catalytic wet peroxide oxidation of sulfamethoxazole in environmentally relevant water matrices

Magnetic carbon xerogels for the catalytic wet peroxide oxidation of sulfamethoxazole in environmentally relevant water matrices

Sn-based catalysts for Baeyer-Villiger oxidations by using hydrogen peroxide as oxidant

Treatment of Actual Chemical Wastewater by a Heterogeneous Fenton Process Using Natural Pyrite

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