Preparation and characterization of TiO2/HZSM-11 zeolite for photodegradation of dichlorvos in aqueous solution

Gómez, Silvina del Valle; Marchena, Candelaria Leal; Pizzio, Luis R.; Pierella, Liliana B.

doi:10.1016/j.jhazmat.2013.04.030

Cited by 94 publications

(50 citation statements)

References 41 publications

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“…4 As a result, there is an urgent need to develop an effective treatment method for the removal of DDVP from the polluted water. Over the past 20 years, different treatment technologies such as biodegradation, ultrasonication, adsorption, and heterogeneous photocatalysis have been studied on the removal of pesticide contamination.…”

Section: 3mentioning

confidence: 99%

“…Over the past 20 years, different treatment technologies such as biodegradation, ultrasonication, adsorption, and heterogeneous photocatalysis have been studied on the removal of pesticide contamination. [4][5][6][7] Among the above various treatment technologies, TiO 2 photocatalysis has been proven as a promising technology for pesticide contamination treatment. [8][9][10] However, the separation and recovery of photocatalyst are difficult, which limit the application of TiO 2 slurry reactor in practical application.…”

Section: 3mentioning

confidence: 99%

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Synthesis of Magnetic Sonophotocatalyst and its Enhanced Biodegradability of Organophosphate Pesticide

Meng¹,

Shi²,

Ming³

et al. 2014

Bulletin of the Korean Chemical Society

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A magnetic sonophotocatalyst Fe 3 O 4 @SiO 2 @TiO 2 is synthesized for the enhanced biodegradability of organophosphate pesticide. The as-prepared catalysts were characterized using different techniques, such as Xray diffraction (XRD) and transmission electron microscopy (TEM). The radial sonophotocatalytic activity of Fe 3 O 4 @SiO 2 @TiO 2 nanocomposite was investigated, in which commercial dichlorvos (DDVP) was chosen as an object. The degradation efficiency was evaluated in terms of chemical oxygen demand (COD) and enhancement of biodegradability. The effect of different factors, such as reaction time, pH, the added amount of catalyst on COD Cr removal efficiency were investigated. The average COD Cr removal efficiency reached 63.13% after 240 min in 12 L sonophotocatalytic reactor (catalyst 0.2 g L −1, pH 7.3). The synergistic effect occurs in the combined sonolysis and photocatalysis which is proved by the significant improvement in COD Cr removal efficiency compared with that of solo photocatalysis. Under this experimental condition, the BOD 5 / COD Cr ratio rose from 0.131 to 0.411, showing a remarkable improvement in biodegradability. These results showed that sonophotocatalysis may be applied as pre-treatment of pesticide wastewater, and then for biological treatment. The synthesized magnetic nanocomposite had good photocatalytic performance and stability, as when it was used for the fifth time, the COD Cr removal efficiency was still about 62.38%.

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Section: 3mentioning

confidence: 99%

Section: 3mentioning

confidence: 99%

Synthesis of Magnetic Sonophotocatalyst and its Enhanced Biodegradability of Organophosphate Pesticide

Meng¹,

Shi²,

Ming³

et al. 2014

Bulletin of the Korean Chemical Society

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“…3,[15][16][17] Within a certain temperature range, the photolysis of pesticides in aqueous solution increases with an increase in temperature. However, the effect of the temperature of the investigated system on the photolysis rate is not unlimited.…”

Section: Effect Of Various Factors On the Photodegradation Kinetics Ofmentioning

confidence: 99%

Kinetics of octachlorodipropyl ether photolysis in aqueous solution

et al. 2015

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The photodegradation kinetics of octachlorodipropyl ether (OCDPE) in aqueous solution have been studied under select conditions. The photodegradation rate constants of OCDPE increase with the increases of temperature and pH. The photolysis rates of OCDPE in the investigated water follow the sequence of pure water>impoundment water>pond water>lake water. The photodegradation product of OCDPE is shown to be 2,3,3-trichloroprop-2-en-1-ol. We propose that the OCDPE photolytic pathways consist of dehydrochlorination and ether cleavage via ionic or radical mediated reaction.

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“…The materials containing TiO 2 obtained by this method can be re-used for several cycles due to their ease of separation in the reaction medium and its interesting photocatalytic properties. In order to improve these properties, several attempts have been proposed for the immobilization of TiO 2 on different supports such as clay [27], silica's [28], polymer [29], activated carbon [30], zeolite [31]… Zeolites are interesting support materials due to their high surface area, uniform pores, unique structures, an excellent adsorption and high thermal stability [32]. To date several zeolites have been used as supports for TiO 2 particles such as ZSM-11 [32], Beta [33], Y and X zeolite [34,35], and natural zeolites [36,37].…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve these properties, several attempts have been proposed for the immobilization of TiO 2 on different supports such as clay [27], silica's [28], polymer [29], activated carbon [30], zeolite [31]… Zeolites are interesting support materials due to their high surface area, uniform pores, unique structures, an excellent adsorption and high thermal stability [32]. To date several zeolites have been used as supports for TiO 2 particles such as ZSM-11 [32], Beta [33], Y and X zeolite [34,35], and natural zeolites [36,37]. In general the increase of the calcination temperature leads to the transformation of amorphous TiO 2 to the anatase or rutile phase [36], but for the preparation of composite TiO 2 /zeolite it is possible to destroy the original framework of the support [37], due to the thermal dehydration of zeolites [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

et al. 2016

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This paper focuses on the synthesis of nanocomposite materials TiO 2 /SAPO-34 using the sol-gel method, which involves preparing a mixture between as-synthesized or calcined SAPO-34 zeolite and TiO 2 gel under hydrothermal crystallization and then calcined at 400 °C for the formation of TiO 2 anatase phase. The structural and textural features of the obtained materials were determined by various physico-chemical techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electronic microscopy (SEM), Nitrogen sorption at 77 K, energy dispersive X-ray analysis (EDX) and ultravioletvisible (UV-vis). The DRX results showed that calcination at 400 °C of the mixture between calcined SAPO-34 and TiO 2 gel led to the collapse of the original framework of zeolite but forms the anatase TiO 2 in a nano-spherical morphology, but the use of as-synthesized SAPO-34 supports provides a mixture phase between SAPO-34 and TiO 2 anatase after calcination. The photocatalytic properties of SAPO-34/TiO 2 andTiO 2 type materials were tested for the removal of methylene blue (MB) dye. The MB degradation proved to be increasing as a function of contact time, catalyst mass and the initial concentration of MB.

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Preparation and characterization of TiO2/HZSM-11 zeolite for photodegradation of dichlorvos in aqueous solution

Cited by 94 publications

References 41 publications

Synthesis of Magnetic Sonophotocatalyst and its Enhanced Biodegradability of Organophosphate Pesticide

Synthesis of Magnetic Sonophotocatalyst and its Enhanced Biodegradability of Organophosphate Pesticide

Kinetics of octachlorodipropyl ether photolysis in aqueous solution

Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

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