Mineralization of phenol by a heterogeneous ultrasound/Fe-SBA-15/H2O2 process: Multivariate study by factorial design of experiments

Molina, R.; Martı́nez, Fernando; Melero, Juan A.; Bremner, David H.; Chakinala, Anand G.

doi:10.1016/j.apcatb.2006.03.015

Cited by 104 publications

(45 citation statements)

References 36 publications

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“…Despite the fact that the hydroxyl radical produced in this pathway can break the pollutants down, the production values are very low. The primary role of ultrasonic waves in the present process is the dissolution improvement of zero-valent iron nanoparticles in the aqueous solution containing the hydrogen peroxide in moderate acidic media (Molina et al, 2006) and inducing a set of complex redox reactions that will produce high levels of hydroxyl radicals (Ghauch et al, 2011). The results show that sonolysis plays major roles in catalyzing the reactions (between hydrogen peroxide and zero-valent iron nanoparticles in this study), which could enhance efficiency and reduce reaction time .…”

Section: Ultrasonic Input Frequencymentioning

confidence: 77%

“…These free radicals attack organic compound and depending on the type and structure of pollutants, completely mineralize them into CO 2 and water (Farzadkia et al, 2014). Ultra sonication has been proved as an efficient method for the improved dissolution of iron particles in moderate acidic media as well as field applications (permeable reactive barriers) (Molina et al, 2006). The concomitant use of zero-valent iron nanoparticles together with ultrasonic irradiation result in enhanced mass transport of reactants, where sonolysis process increases the defects and number of active sites while continuously cleaning it (Eren and Ince, 2010;Zhou et al, 2008 complexes.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Dexamethasone from Aqueous Solutions using Sono-Nanocatalysis Process

Rahmani¹,

Rahmani²,

Rahmani³

et al. 2015

Research J. of Environmental Sciences

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Degradation of dexamethasone (DEX) was investigated using nano-scaled Zero-Valent Iron (nZVI) in the presence of hydrogen peroxide and ultrasound (US). The experiments were performed in different variables such as pH, nZVI dose, H 2 O 2 concentration, DEX concentration and ultrasonic frequency. Maximum removal (92%) was obtained at pH: 4, nZVI: 0.3 g LG 1 , H 2 O 2 : 1.5 mmol, DEX: 15 mg LG 1 and US: 140 kHz. The pH was one of the most important factor influencing the process, also, determining the optimal dose of hydrogen peroxide had to be considered. In this study, degradation reaction kinetics of DEX and efficiency of the removal of COD were investigated in synthetic and actual wastewater.

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Section: Ultrasonic Input Frequencymentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Removal of Dexamethasone from Aqueous Solutions using Sono-Nanocatalysis Process

Rahmani¹,

Rahmani²,

Rahmani³

et al. 2015

Research J. of Environmental Sciences

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“…This indicates, as above-mentioned, that after a certain point the catalyst load has a detrimental effect on the performance (mineralization degree in this case), which can be explained by the formation of iron complexes (iron + organics) when excess amounts of catalyst are present [26]. Other authors have also found this kind of behavior with heterogeneous systems [56,57]. The scavenging of hydroxyl radicals (Eqs.…”

Section: Effect Of the Catalyst Loadmentioning

confidence: 80%

Use of Pillared Clay-Based Catalysts for Wastewater Treatment Through Fenton-Like Processes

Herney-Ramírez

Madeira

2010

Pillared Clays and Related Catalysts

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Clays, both natural and physical-chemically modified, are attractive materials for the preparation of supported catalysts. In this chapter, a review is made regarding the use of pillared interlayered clays (PILCs) in heterogeneous Fentonlike advanced oxidation processes. Their applications in pollutants degradation is summarized, with particular emphasis on the effect of the main operating conditions (e.g., initial H 2 O 2 or parent compound concentration, catalyst load, pH, or temperature) on oxidation efficiency. Special attention is also given to the type of catalyst or precursor used, to the importance and advantages of the heterogeneous versus homogeneous process, and to significant aspects like catalyst stability. Among the technological issues that are of concern, the importance of using continuous flow reactors (e.g., fixed-bed) is discussed. Finally, some mechanistic studies are reviewed as well as modeling works, based on phenomenological or semi-empiric models (e.g., using statistic tools like design of experiments).

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“…Iron-mesoporous silica (SBA-15) composite [85][86][87] has been reported to increase the degradation. The rate was found linearly dependent upon the frequencies but when oxidant species like H 2 O 2 and CuSO 4 were added to the medium, the most efficient degradation was found at 35 kHz.…”

Section: Sonochemical Methodsmentioning

confidence: 99%

“…Sonication of 30 min was reported sufficient to completely destroy phenol and aromatic byproducts. Molina et al [85] investigated phenol oxidation using catalytic wet oxidation assisted with ultrasound irradiation. …”

Section: Sonochemical Methodsmentioning

confidence: 99%

Sonochemical Degradation of Phenol in the Presence of Inorganic Catalytic Materials

Pankaj

Verma²

2010

Theoretical and Experimental Sonochemistry Involving Inorganic Systems

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Degradation of phenol in its aqueous solutions, using various techniques, including ultrasound, have been examined and discussed to better understand the mechanisms involved therein and the advantages as well as the disadvantages associated with the use of inorganic catalytic materials. IntroductionSonochemical degradation of organic molecules [1], employing cavitational effect is not new. Many simple [2] and complex molecules [3] from modest to very high toxicity levels, polluting the aquatic life and the environment have been successfully reduced to relatively non-toxic or lesser harmful species, if not degraded completely by the ultrasound. Although the degree of degradation and the duration of sonication varied considerably, depending upon the nature of moieties, but the sonochemical degradation undergoes either without the addition of extra chemicals or involves the minimum amounts of non-toxic chemicals such as photocatalyst TiO 2 , Fenton's reagent etc., hence can be termed as a green technology. The purpose of this article is to review the sonochemical degradation of phenol, under different experimental conditions and in the presence of several other active chemicals to understand better the mechanisms involved in all such processes.Phenol is an important chemical, from the point of its industrial and commercial applications, but is of great environmental apprehension due to its toxicity. Its chemical name is hydroxybenzene which is more acidic compared to aliphatic alcohols hence is also known as carbolic acid [4]. At ambient temperature and pressure it is a hygroscopic crystalline solid, which is colourless when pure [5] but

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Mineralization of phenol by a heterogeneous ultrasound/Fe-SBA-15/H2O2 process: Multivariate study by factorial design of experiments

Cited by 104 publications

References 36 publications

Removal of Dexamethasone from Aqueous Solutions using Sono-Nanocatalysis Process

Removal of Dexamethasone from Aqueous Solutions using Sono-Nanocatalysis Process

Use of Pillared Clay-Based Catalysts for Wastewater Treatment Through Fenton-Like Processes

Sonochemical Degradation of Phenol in the Presence of Inorganic Catalytic Materials

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