Catalytic bleach: Most valuable applications for smart oxidation chemistry

Dannacher, Josef

doi:10.1016/j.molcata.2006.02.031

Cited by 57 publications

(40 citation statements)

References 29 publications

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“…10,11 In an attempt to solve some of these drawbacks, Fenton-like systems based on heterogeneous catalysts have been the focus of limited studies as a means of oxidising dyes and as stain bleaching reagents incorporated with detergents. 12,13 Hydrogen peroxide can be activated at low temperatures using manganese-based catalysts, e.g. those bearing N-donor ligands.…”

Section: Introductionmentioning

confidence: 99%

“…those bearing N-donor ligands. 12,14 The use of manganese complexes as catalysts has received considerable attention not only because of the high reactivity of these catalysts but also because of their benign environmental effects. Mono-and, especially, bi-nuclear manganese complexes derived from 1,4,7-trimethyl-1,4,7-triazacyclononane (TACN) and related ligands are among the most widely studied.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic study of the manganese‐based catalytic hydrogen peroxide oxidation of a persistent azo‐dye

Tizaoui

Karodia

Aburowais

2009

J of Chemical Tech & Biotech

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BACKGROUND: The discharge of synthetic dyes by the textile industry into the environment poses concerns due to their persistence and toxicity. New efficient treatment processes are required to effectively degrade these dyes. The aim of this work was to study the degradation of a persistent dye (Drimarene Brilliant Reactive Red K-4BL, C.I.147) using H 2 O 2 oxidation catalysed by an Mn(III)-saltren catalyst and to develop a kinetic model for this system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic study of the manganese‐based catalytic hydrogen peroxide oxidation of a persistent azo‐dye

Tizaoui

Karodia

Aburowais

2009

J of Chemical Tech & Biotech

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“…As a consequence, additional requirements for the application of the catalyst in laundry bleaching are: (i) no interactions with dye molecules on cotton and (ii) the inhibition of dye transfer (staining of white textiles by dye molecules coming off the colored fabrics) by bleaching the migrating dyes in the wash liquor. Therefore, the potential application of catalytic oxidation in laundry bleaching involves two types of action: a homogeneous reaction of dye transfer inhibition and a heterogeneous bleaching with a wide variety of stains (hydrophilic as well as oily), without fiber or color damage after a number of repeated washing cycles (Dannacher 2006). Moreover, the detergent producers should always anticipate a possible overdosing done often by consumers in household laundry cleaning.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effects of catalytic bleaching on cotton

et al. 2007

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Hydrogen peroxide can be catalyzed to bleach cotton fibers at temperatures as low as 308C by incorporating dinuclear tri-l-oxo bridged manganese(IV) complex of the ligand 1,4,7-trimethyl-1,4,7-triazacyclononane (MnTACN) as the catalyst in the bleaching solution. The catalytic system was found to be more selective under the conditions applied than the non-catalytic H 2 O 2 system, showing better bleaching performance while causing slightly lower decrease in degree of polymerization (DP) of cellulose. In order to gain fundamental knowledge of the bleach effect on cotton fibers and cellulose as its main component, especially after catalytic bleaching, X-ray Photoelectron Spectroscopy (XPS) was used to study surface chemical effects. The Washburn method was applied to investigate wetting properties, and liquid porosity was used to obtain pore volume distribution (PVD) plots. Parallel analyzes performed on model cotton fabric, i.e. ''clean'' cotton fabric stained with morin -a pigment regularly found in native cotton fiber, helped to differentiate between pigment oxidation and other bleaching effects produced on the (regular) industrially scoured cotton fabric. Bleaching was not limited to the chemical action but also affected cotton fiber capillary parameters most likely due to the removal of non-cellulosic materials as well as chain-shortened cellulose.

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“…Entretanto, outras pesquisas afirmam que fontes de luz tornam o tratamento clareador mais eficaz e seguro 14,17 . A influência dos catalizadores químicos, como os íons de ferro e manganês, aumenta a velocidade da reação por reduzir a quantidade mínima de energia cinética que as moléculas necessitam para a reação começar, proporcionando assim um caminho de menor energia 21 . Neste estudo, o produto empregado no LE contém na sua fórmula agentes catalizadores, e, possivelmente, devido a essa característica o grupo apresentou o mesmo potencial clareador em um menor tempo de aplicação (24 minutos por sessão) quando comparado com o produto usado no grupo LD, com tempo de 45 minutos por sessão.…”

Section: Discussionunclassified

Avaliação de diferentes sistemas de clareamento dental de consultório

Penha

Pinto

Santos

et al. 2016

Rev. da Fac. de Odontologia, UPF

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IntroduçãoA incessante busca pelo belo é preocupação não apenas na sociedade moderna, mas desde as civilizações mais antigas. Um exemplo que merece destaque é a Grécia, onde a simetria e as proporções corretas conformavam os cânones da beleza 1 . Um sorriso harmônico é uma característica marcante para definir uma face como atrativa, alguns fatores como a forma, o tamanho, a cor dos dentes e o seu posicionamento nos arcos dentais estão fortemente ligados à aparência do sorriso. Alterações em alguns desses fatores podem interferir negativamente na vida profissional, ocasionar dificuldades de interação social e diminuir a autoestima do indivíduo 2 . Modificações na cor dos dentes podem ser causadas por fatores extrínsecos e intrínsecos. As pigmentações extrínsecas podem ser obtidas com o consumo de alimentos com corantes, devido ao hábito de fumar e ao uso de alguns medicamentos. Essas manchas são removidas facilmente, visto que estão localizadas sobre a superfície do dente [3][4] . As manchas intrínsecas são de difícil remoção, pois estão incorporadas à estrutura do dente. As pigmentações intrínsecas são classificadas como congênitas e adquiridas. As adquiridas podem ser resultantes de traumatismos dentários, tratamento endodôntico, enquanto que as congênitas são causadas por amelogênese imperfeita, fluorose, dentre outros motivos. Nesses casos, são indicados como

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Catalytic bleach: Most valuable applications for smart oxidation chemistry

Cited by 57 publications

References 29 publications

Kinetic study of the manganese‐based catalytic hydrogen peroxide oxidation of a persistent azo‐dye

Kinetic study of the manganese‐based catalytic hydrogen peroxide oxidation of a persistent azo‐dye

Analysis of the effects of catalytic bleaching on cotton

Avaliação de diferentes sistemas de clareamento dental de consultório

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