Characterization of methyl orange and its photocatalytic degradation products by HPLC/UV–VIS diode array and atmospheric pressure ionization quadrupole ion trap mass spectrometry

Baiocchi, Claudio; Brussino, Maria Carla; Pramauro, Edmondo; Prevot, Alessandra Bianco; Palmisano, Leonardo; Marcı̀, Giuseppe

doi:10.1016/s1387-3806(01)00590-5

Cited by 256 publications

(136 citation statements)

References 12 publications

Supporting

Mentioning

121

Contrasting

Unclassified

Order By: Relevance

“…In fact, the degradation of this anionic model dye is a wellknown process. [21] No photolysis of MO was observed in the absence of photocatalyst. The low photocatalytic activity of TiO 2 is consistent with the low SSA and the poor reactivity of the rutile phase.…”

mentioning

confidence: 99%

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO₂

et al. 2011

View full text Add to dashboard Cite

Herein, we synthesize B,F-doped TiO2 powders and elucidate\ud for the first time the nature of active centers responsible for\ud the catalytic activity of rutile TiO2, even when a very low surface area is present. In particular, we used electron paramagnetic resonance (EPR) for a thorough characterization of catalytically\ud active sites. Since during TiO2 synthesis the presence\ud of B or F dopants induces the low-temperature formation of a\ud mixture of anatase, rutile, brookite polymorphs, the attention\ud was focused on high-temperature-treated materials, containing\ud the pure rutile phase and possessing a negligible surface area.\ud This work demonstrates that a suitable synthetic design can\ud transform even a “stone” with insignificant surface area into a\ud very efficient photocatalyst. Specifically, herein we show the\ud existence of a critical synergic interaction between B and F codopants\ud in rutile titania that weakly enhances Vis-light absorption\ud but, notably, generates active photocatalytic sites. We\ud show that concomitant surface/second layer B and surface F\ud are needed to get a significant MO degradation. The present\ud investigation reveals that dopant distribution in the active material\ud is of key importance and must be carefully considered in\ud tailoring material properties. The simplicity of our preparation\ud synthesis is a significant advantage in view of large-scale applications

show abstract

mentioning

confidence: 99%

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO₂

et al. 2011

View full text Add to dashboard Cite

show abstract

“…In the particular case of MeO, some authors [30,31] have proved, through HPLC analyses, the formation of different intermediates coherent with the hypothesis of the formation of monohydroxylated and dihydroxylated species during the photocatalytic degradation of the dye.…”

Section: Azo Dyesmentioning

confidence: 61%

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

Camarillo

Rincón

2011

Chem Eng & Technol

View full text Add to dashboard Cite

The process of TiO 2 /UV photocatalytic discoloration of wastewaters containing organic dyes is influenced by a number of variables. In this paper, the effects of some of these parameters, i.e., mass of catalyst, initial dye concentration, and pH, were related to the structural nature of the dyes investigated, azo and anthraquinone dyes, two families that are representative of about 75 % of the dyes marketed nowadays. Both bibliographical and own experimental data were used to analyze and discuss the photocatalytic discoloration in terms of dye structure and degradation pathways. It is shown that azo dyes (Methyl Orange, Metanil Yellow, Acid Orange 7, and Reactive Red 120) are more easily discolored than Reactive Blue 19 (anthraquinone dye), due to the higher molecular stability of the latter. It is also shown that azo dye discoloration is more influenced by the initial dye concentration, whereas recalcitrant anthraquinone dyes (Reactive Blue 19) mainly demand for basic pH values to generate enough OH . radicals. Concerning TiO 2 loading, both the bibliographical and current research data showed no effect of this variable in the experimental range analyzed.

show abstract

“…On the other hand, product at 241 m/z could be MO molecules (absence of SO3) which was given in literature (Baiocchi et al, 2002). Aromatic structure of intermadiates generate demethylation reactions by hydroxyl radicals and the molecule at 212 m/z (both methyl groups absence) was observed as by oxidation products (Mascolo et al, 2007;Baiocchi et al, 2002). After the seperation of methyl groups, the OH radicals attack has become to take place on the -N=N-double bond and the aromatic rings of products were degrading to single ring structures such as at 124 m/z (aminoquinone) and 108 m/z (benzoquinone).…”

Section: 3paracetamol Residues In Treated Samples By Ag Doped Tio2mentioning

confidence: 74%

Decolarization of methylene blue and methyl orange with Ag doped TiO2 under UV-A and UV-Visible conditions: process optimization by response surface method and toxicity evaluation

2016

Global NEST Journal

View full text Add to dashboard Cite

MB decolarization with pure TiO2 and Ag doped TiO2 based photocatalytic system were investigated under UV-A and UV-Visible conditions. Different ratios of Ag were used as metal dopant. 1% Ag-TiO2 increased the decolorization efficiencies of MB and MO dyes, also the kapp constant enhanced under UV-A and UVVisible conditions. A central composite analysis showed the effect of initial dye concentration, pH, Ag-TiO2 concentration and the reaction time of photocatalytic process under UV-A irridation in both dyes. The photocatalytic degradation pathways of both dyes by Ag doped TiO2 catalyst were obtained in this study. According to these results, the application of Ag-TiO2 catalyst are proved to be more effective than pure TiO2 catalyst for both MB and MO removal. The toxicity test of Daphnia Magna shows that non toxic wastewater discharge to the receiving environment could be possible with photocatalytic degration by Ag-TiO2 catalyst.

show abstract

Characterization of methyl orange and its photocatalytic degradation products by HPLC/UV–VIS diode array and atmospheric pressure ionization quadrupole ion trap mass spectrometry

Cited by 256 publications

References 12 publications

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO₂

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO₂

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

Decolarization of methylene blue and methyl orange with Ag doped TiO2 under UV-A and UV-Visible conditions: process optimization by response surface method and toxicity evaluation

Contact Info

Product

Resources

About

Characterization of methyl orange and its photocatalytic degradation products by HPLC/UV–VIS diode array and atmospheric pressure ionization quadrupole ion trap mass spectrometry

Cited by 256 publications

References 12 publications

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO2

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO2

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

Decolarization of methylene blue and methyl orange with Ag doped TiO2 under UV-A and UV-Visible conditions: process optimization by response surface method and toxicity evaluation

Contact Info

Product

Resources

About

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO₂

Synergistic Role of B and F Dopants in Promoting the Photocatalytic Activity of Rutile TiO₂