Role of primary active species and TiO2 surface characteristic in UV-illuminated photodegradation of Acid Orange 7

Chen, Yingxu; Yang, Shiying; Wang, Kan; Lou, Liping

doi:10.1016/j.jphotochem.2004.11.006

Cited by 436 publications

(139 citation statements)

References 61 publications

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“…This behavior suggests a strong interaction between the catalyst and the additives. However, unlike the US system, 2-propanol was the additive that had the least impact which is a result of its lower adsorption onto the catalyst surface in aqueous media (Chen et al, 2005).…”

Section: Effect Of Organic Additivesmentioning

confidence: 96%

“…(II) 2-propanol, (2-prop), a primary solvent for topical preparations in pharmaceutical formulations (Rowe et al, 2009) with hydroxyl radical scavenger properties (Chen et al, 2005), whose volatility makes it a true model of volatile compounds. (III) Oxalic acid (OA), a dicarboxillic acid commonly found in natural waters coming from the decomposition of natural organic matter (NOM) (Espinoza et al, 2011), which is used in pharmaceutical co-crystal formulations to enhance the crystalline forms of therapeutic compounds (Jones et al, 2006).…”

Section: Effect Of Organic Additivesmentioning

confidence: 99%

“…In fact, the lowest r NW /r DW ratio was obtained during this process (DXC 0.00639 mmol L À1 ). Previous investigations have shown that anions can be adsorbed onto the positive TiO 2 surface by attractive electrostatic forces, specifically at the holes (Chen et al, 2005;€ Ozkan et al, 2004). Under such conditions, fewer water molecules are oxidized, hydroxyl radical formation is inhibited, and consequently, degradation efficiency is hampered.…”

Section: Effect Of Organic Additivesmentioning

confidence: 99%

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Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Villegas-Guzmán

Silva-Agredo

Flórez

et al. 2017

Journal of Environmental Management

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a b s t r a c tTo provide new insights toward the selection of the most suitable AOP for isoxazolyl penicillins elimination, the degradation of dicloxacillin, a isoxazolyl penicillin model, was studied using different advanced oxidation processes (AOPs): ultrasound (US), photo-Fenton (UV/H 2 O 2 /Fe 2þ ) and TiO 2 photocatalysis (UV/TiO 2 ). Although all processes achieved total removal of the antibiotic and antimicrobial activity, and increased the biodegradability level of the solutions, significant differences concerning the mineralization extend, the pH of the solution, the pollutant concentration and the chemical nature of additives were found. UV/TiO 2 reached almost complete mineralization; while~10% mineralization was obtained for UV/H 2 O 2 /Fe 2þ and practically zero for US. Effect of initial pH, mineral natural water and the presence of organic (glucose, 2-propanol and oxalic acid) were then investigated. UV/H 2 O 2 /Fe 2þ and US processes were improved in acidic media, while natural pH favored UV/TiO 2 system. According to both the nature of the added organic compound and the process, inhibition, no effect or enhancement of the degradation rate was observed. The degradation in natural mineral water showed contrasting results according to the antibiotic concentration: US process was enhanced at low concentration of dicloxacillin followed by detrimental effects at high substrate concentrations. A contrary effect was observed during photo-Fenton, while UV/TiO 2 was inhibited in all of cases. Finally, a schema illustrating the enhancement or inhibiting effects of water matrix is proposed as a tool for selecting the best process for isoxazolyl penicillins degradation.

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Section: Effect Of Organic Additivesmentioning

confidence: 96%

Section: Effect Of Organic Additivesmentioning

confidence: 99%

Section: Effect Of Organic Additivesmentioning

confidence: 99%

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Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Villegas-Guzmán

Silva-Agredo

Flórez

et al. 2017

Journal of Environmental Management

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“…Several scavengers were employed to further confirm the specific reactive species that play important roles in this VLD photocatalytic process: sodium oxalate for holes (15), KI for holes and · OH s on photocatalyst (16), isopropanol for · OH in the bulk (16,17) (denoted as · OH b ), and Cr(VI) for electrons (16). Figure 7 shows the photodegradation efficiencies of RhB by Zn:In(OH) y S z -SSN in the presence of these scavengers under VL.…”

Section: Photocatalytic Mechanism(s)mentioning

confidence: 99%

“…With the addition of KI, the decolorization rate of RhB drops sharply and only 17% of RhB is degraded after 60 min. Upon purging with nitrogen and the addition of Cr(VI), the role of species generated at the reduction site on the surface of photocatalyst such as · O 2 -and · OH s could be ignored, since the photogenerated electrons are quenched by Cr(VI) (16). Thus, in the presence of 0.5 mmol L -1 K 2 Cr 2 O 7 upon purging with nitrogen, the photodegradation efficiency reaches only 32%.…”

Section: Photocatalytic Mechanism(s)mentioning

confidence: 99%

Zn:In(OH)_yS_z Solid Solution Nanoplates: Synthesis, Characterization, and Photocatalytic Mechanism

Zhang

Wong

Zhang

et al. 2009

Environ. Sci. Technol.

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Zn:In(OH) y S z solid solution nanoplates (Zn:In(OH) y S z -SSNs) with uniform nanoparticle size were synthesized through a simple sodium dodecyl sulfate (SDS)-assisted hydrothermal process. To achieve better photoabsorption in the visible light (VL) region and suitable redox potentials of the Zn:In(OH) y S z solid solution (Zn:In(OH) y S z -SS), the substitution of S2− for OH− was carried out by adjusting the concentration of thiourea and SDS in the synthesis solution, while the doping of Zn2+ was realized by adjusting Zn2+ concentration. In addition, the morphology and crystallinity of Zn:In(OH) y S z -SSs were also controlled by the concentration of SDS. Using Rhodamine B (RhB) as a target pollutant, the photocatalytic performance of these Zn:In(OH) y S z -SSs with different components, diameter sizes, and morphologies was investigated. Remarkably, Zn:In(OH) y S z -SSNs prepared with atomic ratio of Zn2+ and In3+ of 0.6, 45 mmol L−1 thiourea, and 26 mmol L−1 SDS, have the highest visible-light-driven (VLD) photocatalytic activity, exceeding 95% for the degradation of RhB after 60 min. The investigation of photocatalytic mechanism further indicates that the holes, superoxide radical (·O2 −) and surficial hydroxyl radical (·OHs) are the major reactive species for the photocatalytic reactions. More importantly, for the first time, a simple and versatile strategy is developed to confirm the fact that direct contact between the Zn:In(OH) y S z -SS and RhB is the prerequisite for the photocatalytic degradation of RhB. Therefore, we report not only the preparation of a novel and effective VL-driven photocatalyst, but also provide mechanistic insight into semiconductor photocatalysis.

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Processes and Mechanisms in Hydrothermal Degradation of Waste Electric and Electronic Equipment

Yu¹,

He²,

Li³

2015

Reactions and Mechanisms in Thermal Analysis of Advanced Materials

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Role of primary active species and TiO2 surface characteristic in UV-illuminated photodegradation of Acid Orange 7

Cited by 436 publications

References 61 publications

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Zn:In(OH)_yS_z Solid Solution Nanoplates: Synthesis, Characterization, and Photocatalytic Mechanism

Processes and Mechanisms in Hydrothermal Degradation of Waste Electric and Electronic Equipment

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Role of primary active species and TiO2 surface characteristic in UV-illuminated photodegradation of Acid Orange 7

Cited by 436 publications

References 61 publications

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Zn:In(OH)ySz Solid Solution Nanoplates: Synthesis, Characterization, and Photocatalytic Mechanism

Processes and Mechanisms in Hydrothermal Degradation of Waste Electric and Electronic Equipment

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Product

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Zn:In(OH)_yS_z Solid Solution Nanoplates: Synthesis, Characterization, and Photocatalytic Mechanism